Converting 1960s Fender amp for 240V UK use
N_Cook
retrievable. I've convinced him that a fully bonded earth point to the
chassis is absolutely necessary for use in the UK, no getting away from
that.
Hopefully the US mains cable rubber insulation will be perished and will
need replacing anyway so would then be 3 core.
He definitely does not want the step down transformer mounted in the cab,
but external .
But if original US mains cable and US plug retained.
I'm thinking earthing coloured multistrand flexible third cable run
alongside the US cable with black heatshrink over the near-enough whole
length. The problem is what connector to use for reliable earth continuity
to the step down Tx and UK mains cable and how to make a mechanical
interlock, in effect, so the amp cannot be run without the third wire
connected.
Then what to do with the original "ground" switch ? presumably disconnect
but leave in place internally .
Do US three pin variant outlet, purpose made, step down transformers exist
in the UK, I only ever see 2 pin outlet ones. Assuming he can tolerate
swapping, but retaining with the amp, the ancient 2 pin plug.
Geoffrey S. Mendelson
I live in Israel and have the same problem all the time. First of all, the
transformers you buy in the shops in plastic cases are junk. They are
rated in VA and sold as if that were Watts, so you never get the size you
need.
They almost never carry the ground through.
They are also autotransformers, not real transformers, so they do NOT provide
any isolation.
Luckilly we have a guy here who makes transformers. He is not cheap, but he
will make one to specification.
What you want is:
1. A True transformer (no connection of any sort to the mains,
i.e. isolation).
2. Ground carried through, i.e. the grounding pin of the 120 volt socket
is directly connected with a decent sized wire to the grounding pin
of the mains plug.
3. A easilly accessable fuse socket in the secondary (120 volt side).
4. At least 50% more than the maximum current draw rating if in real Watts
and DOUBLE if VA. Note that maximum is not always the rated value.
5. Since US equipment made in now is designed for 127 volts, not 115 or 120,
the ratio should be adjusted for a slightly higher output than 2:1
(240/130 instead of 240/120).
1950's equipment would be better off with a slightly lower ratio
(240/115 or 240/110) and heaivly motorized equipment (mentioned for
compelteness) should be lower (240/110 or 240/100 for compressors)
because of the different power factor.
BTW, if you've never done this type of work before, be careful about the
voltages, replace all the capacitors and buy yourself a large bottle of
DE-OXIT and a bunch of toothpicks (to apply it).
Geoff.
--
Geoffrey S. Mendelson N3OWJ/4X1GM
Making your enemy reliant on software you support is the best revenge.
N_Cook
news:slrnj0oi6...@cable.mendelson.com...
All original inside except one resistor. 1964 Twin Reverb. I see US 3 pin
outlet auto transformers are available.
But owner wants to retain the moulded , sorry molded, 2 pin plug. All I can
think of is making a 2 part shroud that fits overe the existing plug and
includes a third earthing pin to mate with the 3 pin outlet, also retaining
polarisation for added safety (assuming anyone rewiring the UK main plug in
the future , wires it correctly).
Third wire under heatshrink and bonded to the chassis mounted 110V outlet ,
removing the PK and replacing with a bolt and lock nut/star washer inside.
Some sort of shrouding over the earth /chassis bond and exposed stub of
wire.
I'll try and convince him to go for isolating rather than auto but the
original 2 pin plug plus grounding pin union problem remains.
N_Cook
sheathing looks fine, how to non-destructively check for internally mangled
insulation or wiring filaments inside the cable strain relief?
Jeffrey Angus
> I really want to be able to condemn the mains lead.
You could, of course, tell him to take it elsewhere
because you're not going to be involved in him killing
himself.
Jeff
--
"Everything from Crackers to Coffins"
Wild_Bill
friend, even.
If the amp is so valuable to him, he should have it insured and not be using
it.. and buy a display case to protect it.
A proper step-down isolating transformer (not auto transformer buck types)
would allow 120VAC operation, just the way it was made.
Amp and guitar isolated.
As long as the users of the amp don't plug in any line-operated
accessories/equipment (patch to mixers etc) the amp should operate
flawlessly.
Any accessories (pedals etc) added between the guitar and amp should be
battery powered only.
Battery only.
No exceptions.
So.. a 5-6A? capacity (see the amp's fuse rating) 240 to 120 step-down
isolation transformer (no 3/third wire BS for the amp) with only 1 single,
2-blade 120VAC outlet.
The single 120VAC outlet is a factor because idiots will start plugging more
crap into it.
If the user has any problems (likely to be self-induced), he can take it up
with the manufacturer of the isolation transformer..
and he should be informed of this, as his only option.
Or.. pull the amp chassis out of the case, and install a properly grounded
240VAC amp chassis in it's place.
--
Cheers,
WB
.............
"N_Cook" <div...@tcp.co.uk> wrote in message
news:iuhfek$65a$1...@dont-email.me...
N_Cook
news:iuhnaq$idm$1...@dont-email.me...
A possible face-saving route. Release the tethered 2 part mains cable strain
relief, bend the cable back and forth at that strain point enough times and
let the owner feel the floppy section. Then 3 core can go in place.
Smitty Two
wrote:
Doesn't sound like you, deliberately sabotaging and destroying
customer-owned equipment, as a means of coercion. Either set it up the
way the customer wants, or walk away from the job based on your safety
concerns.
Phil Allison
"Wild Bullshit Artist
>
> A proper step-down isolating transformer (not auto transformer buck types)
> would allow 120VAC operation, just the way it was made.
> Amp and guitar isolated.
** But that is NOT how such amps work in the USA.
Note the switch and the 0.047uF cap in the AC line to the amp - this is
the " polarity switch" and it connects the chassis to one or other side of
the AC supply via the cap. Users are meant to select the less noisy
position, which equates to the neutral conductor.
To duplicate this set up , the isolation stepdown tranny must have one side
of its secondary linked to the supply ground.
The only thing left " un-American " then is the frequency of 50Hz - which
WILL cause the power tranny to get rather hot.
> As long as the users of the amp don't plug in any line-operated
> accessories/equipment (patch to mixers etc) the amp should operate
> flawlessly.
** It will work fine even with them - you posturing ass.
> Any accessories (pedals etc) added between the guitar and amp should be
> battery powered only.
> Battery only.
> No exceptions.
** Total lunacy.
The amp will always be safer if the chassis is grounded.
> So.. a 5-6A? capacity (see the amp's fuse rating)
** A 300VA isolation stepdown tranny would be plenty.
.... Phil
Wild_Bill
... and the whores you rode in on.
You know all of this because you personally designed or reviewed/approved
every fuckin piece of audio-related equipment that any idiot may attempt to
attach to an amp.
Well, it seems you haven't.. or you might have a GD clue.. many PROPER
isolation transformers DO have a side to ground thru a high-value resistor.
Wow.. a transformer that generates heat? You complete dumbass.
Overheat - NO.
Use all the space you need to list all the electrical devices that DON'T
generate heat.
>Shame how so many OPs post entirely in meaningless generalisations.
>Means that is how they are thinking too.
>..... Always BITCHING UNBALANCED Phil
--
Cheers,
WB
.............
"Phil Allison" <phi...@tpg.com.au> wrote in message
news:974nkn...@mid.individual.net...
Phil Allison
"Wild Bullshit Artist"
** WB is a raving, paranoid schizophrenic.
If he were not such a fucking asshole, one might feel a bit sorry for him.
------------------------------------------------------------------------------
N_Cook
shell. Just space to mould in the existing US plug and fix in a third pin.
All demountable leaving the original cable and plug untouched, if so
required. Then either black nylon spiral wrap or heatshrink over the green
wire along the original cable. Satisfying the original brief but would be a
lot cheaper for him just having 2 core cable replaced with 3 core and 3 pin
plug, retained in the cab for any , unlikely, future USA based user.
Mark Zenier
Don't you Brits use a 110 Volt (center tapped) system for construction
site power tools? On a lot of '60s vintage transformer powered tube
gear, the only connection between either side of the power cord to chassis
ground* was a small filter cap. So the amp may be perfectly happy running
that way as neither side of the power line was expected to be ground.
And, if something goes wrong, at 60 volts or so, it should keep your
customer from killing himself.
*Ground came from somewhere else, as the gear was floating at 1/2 the
power voltage at high impedance. (Made working on transistor circuits
with an old tube 'scope a learning experience. First lesson: always
hook up the ground lead first).
Mark Zenier mze...@eskimo.com
Googleproofaddress(account:mzenier provider:eskimo domain:com)
et...@whidbey.com
Since the owner wants the amp to be at least retrievable then why not
un-solder the old cord, coil it uo, and store it inside the amp.
Re-wire witha grounded cord. Then if he ever wants to return the thing
to stock someone can remove the cord from inside the amp and solder
it back in place. Probably my suggestion will not please your customer
though, you must have already suggested this.
Eric
Meat Plow
Why be a prick? Are your Ewes not in heat?
--
Live Fast Die Young, Leave A Pretty Corpse
Meat Plow
> "Wild Bullshit Artist"
We know you are.
Aliax
<news:pan.2011.07...@emutt.macspoofer.lmao>:
> On Fri, 01 Jul 2011 13:21:14 +1000, Phil Allison wrote:
>
>> "Wild Bullshit Artist"
>
> We know you are.
And we know yer a poor, lonely, stupid fuck who barely makes enough
money to put food on the table, keep his crappy car running, and make
rent payments.
Forget about those delinquent credit card bills... you haven't been
able to pay them for two years.
What a loser. And yer son's gonna grow up to be just like his daddy, a
low-rent loser. That fruit didn't fall far from the tree.
--
___ ___ ___ ___
/\ \ /\__\ ___ /\ \ /\__\
/::\ \ /:/ / /\ \ /::\ \ /::| |
/:/\:\ \ /:/ / \:\ \ /:/\:\ \ /:|:| |
/::\~\:\ \ /:/ / /::\__\ /::\~\:\ \ /:/|:| |__
/:/\:\ \:\__\ /:/__/ __/:/\/__/ /:/\:\ \:\__\ /:/ |:| /\__\
\/__\:\/:/ / \:\ \ /\/:/ / \:\~\:\ \/__/ \/__|:|/:/ /
\::/ / \:\ \ \::/__/ \:\ \:\__\ |:/:/ /
/:/ / \:\ \ \:\__\ \:\ \/__/ |::/ /
/:/ / \:\__\ \/__/ \:\__\ /:/ /
\/__/ \/__/ \/__/ \/__/
WHO IS MEATPLOW from Alt.Usenet.Kooks (AUK)?
The obese, abusive, ugly, snaggle-toothed, gay 'bear' biker retard
who likes to surf gay porn sites as 'BlancoBear' while wearing only
assless chaps:
William Malone Griffith, Jr. (aka Milt, aka MeatPlow, aka BlancoBear)
308 10th Street NE
North Canton, OH 44720-2023
Evidence:
--------------------
http://groups.google.com/group/alt.usenet.kooks/msg/5650f8e1e7dedefa
Message-ID: <fc5167ee7ad8e6f6...@rip.ax.lt>
http://groups.google.com/group/sci.electronics.repair/msg/e52ffbb346f5b764
Message-ID: <ac995ab01f76a177...@rip.ax.lt>
http://groups.google.com/group/alt.usenet.kooks/msg/a94a2a11df601e39
Message-ID: <f6ccd46e74bff6e9...@rip.ax.lt>
http://groups.google.com/group/sci.electronics.repair/msg/ef80aad2e7db945d
Message-ID: <2abe74de52d65b60...@rip.ax.lt>
--------------------
MeatPlow personal info:
--------------------
Birthdate: Oct 3, 1955
Amateur Radio callsign N8NCX
Technician Plus
(2 meter, 6 meter)
--------------------
Photo of MeatPlow in Belden Village Music store:
--------------------
(Note the guitars in the background, the planet-sized head,
the rotten-Chiclet teeth, and general look of retardation)
http://www.productwiki.com/william-malone-griffith-ii/lists/
http://images.productwiki.com/upload/images/william_malone_griffith_ii_avatar_1_0-150-150.jpg
He's got his father's nose and eyes:
http://www.legacy.com/guestbook/kentucky/guestbook.aspx?pid=2527782
http://mi-cache.legacy.com/usercontent/guestbook/photos/2005-09/6966764.jpg
--------------------
MeatPlow email addresses:
--------------------
http://web.archive.org/web/20010305113423/http://www.k1hk.org/ugb_archive3.html
"Bill N8NCX wgri...@neo.rr.com"
wgriffit at neo.rr.com (neo = North East Ohio)
mhywattt at yahoo.com
mhywatt at yahoo.com
--------------------
MeatPlow admits to being from Ohio:
--------------------
Message-ID: <pan.2011.05...@emutt.macspoofer.lmao>
Message-ID: <pan.2011.05...@emutt.macspoofer.lmao>
--------------------
MeatPlow's brushes with the law:
--------------------
1}
http://www.starkcountycjis.org/crim/crim_display_docket_main?pass_case_no=11543&pass_case_type=VBD&pass_case_year=2002&pass_first_name=William&pass_last_name=Griffith
2}
http://www.starkcountycjis.org/civil/civil_display_docket_main?case_year_no=2009-3533&litigant_txt=Griffith
--------------------
MeatPlow quotes:
--------------------
Message-ID: <pan.2011.05...@emutt.macspoofer.lmao>
"I have no shame here in Usenet."
Message-ID: <pan.2011.05...@emutt.macspoofer.lmao>
"I'd bet $200.00 of that Keiser money you still have that you will
leave before me."
Message-ID: <pan.2011.05...@emutt.macspoofer.lmao>
"You know i have a legal team who specializes in internet law. And I
won't hesitate to get them in on the action."
Message-ID: <pan.2011.05...@emutt.macspoofer.lmao>
"I haven't changed nor do I plan on it any time in the near future.
And yes I am bullet-proof as I have proved it."
MeatPlow visits a massage parlor for a Happy Ending massage.
But they refused to give him a Happy Ending his second time there.
That explains why he's gay, he can't even PAY for HAND JOBS from
women.
http://www.clreviews.com/forums/showpost.php?p=11679
"One time I got a HE, and the 2nd time I didn't. I was asked if I was
there both times and said I was. That's is why I didn't know if I said
something wrong the 2nd time which made me not get a HE."
Well, at least we know what he does with his weekends.
--------------------
Oh, William, what would yer family say if they learned yer secrets?
Mother:
..----------------------------.
Catherine & Angelo Griffith
4760 Echovalley St. NW
North Canton, OH 44720-7504
330-494-5785
'----------------------------'
Sister:
..----------------------------------------.
Pamela L. & Roger R. Werling
{ son Todd E. Werling (Ft. Wayne, IN) }
{ son Chris (Kennesaw, GA) }
{ son Keith (Ft. Wayne, IN) }
{ son Easton }
{ son Zakary }
{ daughter Camella }
7704 Bisque Court
Fort Wayne, IN 46825-3501
260-489-6086
'----------------------------------------'
Sister:
..----------------------------------------------.
Cheryl J. & Jason 'Sparky' Humberto E. Rivera
{ daughter Christina }
{ daughter Rosalio (North Canton, OH) }
{ daughter Maria (North Canton, OH) }
{ son Len Gray (Ft. Worth, TX) }
5225 Echo Valley St. NW
North Canton, OH 44720-9702
----------------------------------------------
Belden Village Music
6787 Wales Ave NW
North Canton, OH 44720
beldenvillagemusic.com
330-497-9292
----------------------------------------------
Rosalio B & Maria I Rivera
444 Wales Rd. NE
Massillon, OH 44646-5875
330-833-4291
----------------------------------------------
PO Box 35093
Canton, OH 44735
'----------------------------------------------'
Sister:
..---------------------------------------.
Carol L. & Ric A. Campbell
{ son Richard }
{ son Christopher (North Canton, OH) }
{ son Brandon († 30 May 1996) }
{ daughter Erin }
6794 William Tell Ave NW
North Canton, OH 44720-6546
330-497-7980
330-499-5107
---------------------------------------
PO Box 36473
Canton, OH 44735
'---------------------------------------'
Sister:
..----------------------------------.
Christine H. & Shelton M. Vick
{ son Matthew }
3915 Harvard Ave NW
Canton, OH 44709-1538
330-493-5645
----------------------------------
Re/Max Edge Realty
North Canton / Massillon / Canton
Realtor Christine H. Vick
6929 Portage St. NW
North Canton, OH 44720-6535
330-236-5100
888-830-6509 (fax)
330-904-0883 (cell)
www.MyOhioHomeFinder.com
MyOhioHo...@gmail.com
'----------------------------------'
Sister:
..----------------------------.
Angela C. & Mark Warshefski
11 SE 12th St.
Pompano Beach, FL 33060
954-785-4716
----------------------------
4760 Echovalley St. NW
North Canton, OH 44720-7504
330-942-0584
'----------------------------'
Cousin:
..-------------------------.
Eddy Dailey
Bergholz Super Mart
861 Washington St.
Bergholz, OH 43908
740-768-1018
-------------------------
Bergholz Financial Corp.
dba SuperMart
PO Box 545
524 Garfield St.
Bergholz, OH 43908
'-------------------------'
Cousin:
..--------------------.
Donna L. Dailey
524 5th St.
Bergholz, OH 43908
740-768-2416
--------------------
Bergholz Super Mart
861 Washington St.
Bergholz, OH 43908
740-768-1018
--------------------
Bergholz, OH EMT
'--------------------'
Cousin:
..-------------------.
Bill & Joyce Leas
{ son Billy }
243 2nd St.
Bergholz, OH 43908
'-------------------'
Niece:
..---------------------------.
Rachel & Adam T. Livengood
{ son Lukas }
{ daughter Lauren }
6342 Palmer Dr. NW
Canton, OH 44718
330-497-7754
'---------------------------'
Izzatchoo, or yer dead daddy?
..--------------------------------.
William M. Griffith
between 3rd and 4th St.
between Monroe and Lincoln Ave.
Bergholz, OH 43908
740-768-2539
'--------------------------------'
What would yer landlord for 308 10th St. NE,
North Canton, OH say if they learned yer secrets?
..----------------------------.
David S. and Joan R. Shaner
2095 Waterbury Dr.
Uniontown OH 44312
330-699-4042
'----------------------------'
What would the employees at yer family's
business say if they learned yer secrets?
..-----------------------------------------.
Ohio Kentucky Oil Corporation
aka Ohio Oil & Gas Exploration (defunct)
aka Ohio Kentucky Coal Company (defunct)
5112 Portage St. NW
Canton, OH 44720-6856
(330) 494-8810
(330) 497-7980
-----------------------------------------
110 E. Lowry Lane
Lexington, KY 40503
(800) BUY 4 OIL
(800) 289-4645
(859) 223-5656
(859) 223-5946
(859) 276-0699 (fax)
(859) 276-3500
(859) 276-4080
-----------------------------------------
http://www.ohiokentuckyoil.com
oils...@insightbb.com
ad...@ohiokentuckyoil.net
'-----------------------------------------'
----------
Oh, but wait, Ohio Oil & Gas Exploration is no longer incorporated in
Ohio:
Daddy Griffith's petrol exploration company (defunct):
http://www2.sos.state.oh.us/pls/bsqry/f?p=100:7:3376481605987832::NO:7:P7_CHARTER_NUM:384125
Nor are any of the other businesses yer daddy started. You let them
all fail:
Daddy Griffith's stables (defunct):
http://www2.sos.state.oh.us/pls/bsqry/f?p=100:7:3376481605987832::NO:7:P7_CHARTER_NUM:377966
Daddy Griffith's motel business (defunct):
http://www2.sos.state.oh.us/pls/bsqry/f?p=100:7:3376481605987832::NO:7:P7_CHARTER_NUM:377965
Daddy Griffith's drilling company (defunct):
http://www2.sos.state.oh.us/pls/bsqry/f?p=100:7:3376481605987832::NO:7:P7_CHARTER_NUM:347837
Daddy Griffith's metals business (defunct):
http://www2.sos.state.oh.us/pls/bsqry/f?p=100:7:3376481605987832::NO:7:P7_CHARTER_NUM:552193
And Ohio Kentucky Oil Corporation is on its last legs, inundated with
securities fraud lawsuits and EPA lawsuits. It's barred from
soliciting investors in Tennessee, it's under investigation in Ohio
and Kentucky, it owns no oil assets or wells, and it no longer does
any of its own drilling. It'll be gone soon, too.
And you've squandered everything Daddy Griffith earned from his
businesses, so yer now poor, adding insult to injury.
----------
You being poor is why you issued the following. You knew you didn't
have ten thousand dollars or so to defend yerself against yet another
lawsuit:
William Malone Griffith, II's grovelfest of an apology for being a
fucktard stauker:
==================================================
http://groups.google.com/group/alt.usenet.kooks/browse_thread/thread/8d753c94bd612f4e
http://www.freak-search.com/en/thread/3859383/meat_plow_exposed
http://groups.google.com/group/alt.usenet.kooks/msg/c9fccf0d1ab26ace
Message-ID: <3n4c2e....@news.alt.net>
Title: Apology to Charles Novins
The witnesses to this abject, groveling apology:
Angela Griffith = Angela C. Griffith-Warshefski, William Malone
Griffith, Jr.'s sister
Catherine Griffith = William Malone Griffith, Jr.'s mother
Julia M. Griffith = ?
Cheri Griffith = Cheryl J. Griffith-Rivera, William Malone Griffith,
Jr.'s sister
Justin Griffith = ?
Kristy Griffith = Christine H. Griffith-Vick, William Malone Griffith,
Jr.'s sister
-----
Questions yet to be answered:
Who are Julia M. Griffith and Justin Griffith?
Angela C. Griffith-Warshefski came all the way from Pompano Beach,
Florida to witness and sign MeatPlow's apology letter?
Or did William Malone Griffith, Jr. forge the witness signatures,
which would indicate some level of insincerity in the apology?
If William Malone Griffith, Jr. did indeed forge the witness
signatures, is his family cognizant of him using them in this way?
==================================================
The exit is -.
|
'-----.
.---. .-----. |
| | '---. | |
'-. `-----|-' |
| '---'
'------------->
thataway
Aliax
<news:pan.2011.07...@emutt.macspoofer.lmao>:
> On Fri, 01 Jul 2011 11:53:24 +1000, Phil Allison wrote:
Yer not in heat? That explains why he's such a prick lately, then.
Better just take one for the team, Willy, and let him work off his
aggressions on yer ass, like he usually does.
--
___ ___ ___ ___
/ /\ / /\ ___ / /\ / /\
/ /::\ / /:/ /__/\ / /::\ / /::|
/ /:/\:\ / /:/ \__\:\ / /:/\:\ / /:|:|
/ /::\ \:\ / /:/ / /::\ / /::\ \:\ / /:/|:|__
/__/:/\:\_\:\ /__/:/ __/ /:/\/ /__/:/\:\ \:\ /__/:/ |:| /\
\__\/ \:\/:/ \ \:\ /__/\/:/ \ \:\ \:\_\/ \__\/ |:|/:/
\__\::/ \ \:\ \ \::/ \ \:\ \:\ | |:/:/
/ /:/ \ \:\ \ \:\ \ \:\_\/ |__|::/
/__/:/ \ \:\ \__\/ \ \:\ /__/:/
\__\/ \__\/ \__\/ \__\/
N_Cook
news:iukv8...@enews1.newsguy.com...
Site transformers , tend to be bright yellow and start at 1000VA, so an
appreciable weight and industrial size connectors.
petrus bitbyter
"N_Cook" <div...@tcp.co.uk> schreef in bericht
news:iuhfek$65a$1...@dont-email.me...
IMHO the only way to solve all the problems that has been risen, is finding
a good, fully insulated 50Hz to 60 Hz converter. That way you can ground the
enclosure of the converter as well as one side of the 60Hz output. An
American outlet that matches the Fender plug can be build in the converter
so you do not need to modify that Fender at all. No need to say that the
converter has to provide a clean 60Hz sine wave as well as enough power to
satisfy the Fender all of the time.
petrus bitbyter
Phil Allison
"petrus bitbyter"
>
> IMHO the only way to solve all the problems that has been risen, is
> finding a good, fully insulated 50Hz to 60 Hz converter. That way you can
> ground the enclosure of the converter as well as one side of the 60Hz
> output. An American outlet that matches the Fender plug can be build in
> the converter so you do not need to modify that Fender at all. No need to
> say that the converter has to provide a clean 60Hz sine wave as well as
> enough power to satisfy the Fender all of the time.
** Massively silly idea.
50Hz to 60Hz sine wave converters capable of 300VA at 120 Volts AC are not "
off the shelf " items.
One would have to be custom built and there is simply no need.
Just use a normal 240/120 step down transformer and ground one side of the
secondary - perfectly safe and legal.
If there is any concern about how warm the tranny in the Fender Twin is
getting, just place a small fan behind the amp.
My god you fuckwits here know how to complicate simple matters.
.... Phil
spamtrap1888
> "Wild Bullshit Artist"
>
> ** WB is a raving, paranoid schizophrenic.
>
> If he were not such a fucking asshole, one might feel a bit sorry for him.
>
> ------------------------------------------------------------------------------
>
> > A proper step-down isolating transformer (not auto transformer buck types)
> > would allow 120VAC operation, just the way it was made.
> > Amp and guitar isolated.
>
> ** But that is NOT how such amps work in the USA.
>
>
> Note the switch and the 0.047uF cap in the AC line to the amp - this is
> the " polarity switch" and it connects the chassis to one or other side of
> the AC supply via the cap. Users are meant to select the less noisy
> position, which equates to the neutral conductor.
>
> To duplicate this set up , the isolation stepdown tranny must have one side
> of its secondary linked to the supply ground.
>
> The only thing left " un-American " then is the frequency of 50Hz - which
> WILL cause the power tranny to get rather hot.
At that point I would look into getting a 240V 50/60Hz power
transformer with the proper voltage taps on the secondary.
http://shop.amppartsdirect.com/Power_c4.htm
Phil Allison
"spamtrap1888"
"Phil Allison"
** Well, nothing on that page is any use.
The idea of changing any of the parts in this vintage pile of junk has been
excluded by the lunatic owner - I kid you not, some fuckwit collectors
expect techs to repair such amps while replacing nothing.
In any case, a 240 volt 50Hz rated replacement is physically larger ( goes
on export versions ) and will not fit the cut out in the chassis for the amp
in question.
... Phil
petrus bitbyter
"Phil Allison" <phi...@tpg.com.au> schreef in bericht
news:97aa96...@mid.individual.net...
You may be right, you may be wrong but I got 60Hz trannies fried on 50Hz
mains. I'd take no risk with a - at least in the owners eye - precious
Fender.
petrus bitbyter
Geoffrey S. Mendelson
> You may be right, you may be wrong but I got 60Hz trannies fried on 50Hz
> mains. I'd take no risk with a - at least in the owners eye - precious
> Fender.
It's not SUPPOSED to happen, but it does. A properly spec'ed 60Hz transformer
will happily work on 50Hz, right at the edge of where it was supposed to
be run. (20% overload)
However, quite often things sold in the US were not spec'ed properly, they
were designed to work at 60Hz, without a big change in frequency or current
draw.
I had a wonderful Phase Linear 400 watt per channel amp I had to sell when I
left the US because their transformers were well known not to be able to
stand 50Hz. :-(
Jeff Liebermann
<g...@mendelson.com> wrote:
>However, quite often things sold in the US were not spec'ed properly, they
>were designed to work at 60Hz, without a big change in frequency or current
>draw.
>
>I had a wonderful Phase Linear 400 watt per channel amp I had to sell when I
>left the US because their transformers were well known not to be able to
>stand 50Hz. :-(
It's fairly easy to build a 50Hz to 60Hz switching inverter. Start
with a 230V 50Hz power supply that produces 330VDC. Then run the
330VDC through a 60Hz chopper to get a 330VDC peak-to-peak square
wave. If your xformer is fails to appreciate square waves and
converts the harmonic energy into heat, then something more
sophisticated, like a step approximated sine wave switcher can replace
the chopper.
Well, maybe this is overkill (and inefficient):
<http://www.hzfrequencyconverter.com>
Also, I just downloaded the Phase Linear 400 schematic:
<http://www.schematicsunlimited.com/download.php?manu=phase-linear&file=phase-linear-400-power-amplifier-schematic.pdf>
and found that the xformer is just a full wave center tapped single
winding (other than the winding running the pilot lights). You could
possibly have found a 50Hz replacement for something that simple or
deviced another +75v/-75v power source. Oh well, too late.
--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558
Jeffrey Angus
> My god you fuckwits here know how to complicate simple matters.
Yeah but that's half the fun.
I'm thinking of a nice motor-generator set with a
common armature. ;-)
And a nice roll around cabinet. Tolex covering of
course with shiny brass fittings.
Phil Allison
"Geoffrey S. Mendelson"
>
> I had a wonderful Phase Linear 400 watt per channel amp I had to sell when
> I
> left the US because their transformers were well known not to be able to
> stand 50Hz.
** That is utter bullshit !!
I have personally seen 120 VAC Phase Linear 400s, here in Sydney running on
a step down tranny and doing fine.
..... Phil
Phil Allison
"petrus bitbyter"
> "Phil Allison"
>>>
>>> IMHO the only way to solve all the problems that has been risen, is
>>> finding a good, fully insulated 50Hz to 60 Hz converter. That way you
>>> can ground the enclosure of the converter as well as one side of the
>>> 60Hz output. An American outlet that matches the Fender plug can be
>>> build in the converter so you do not need to modify that Fender at all.
>>> No need to say that the converter has to provide a clean 60Hz sine wave
>>> as well as enough power to satisfy the Fender all of the time.
>>
>>
>> ** Massively silly idea.
>>
>> 50Hz to 60Hz sine wave converters capable of 300VA at 120 Volts AC are
>> not " off the shelf " items.
>>
>> One would have to be custom built and there is simply no need.
>>
>> Just use a normal 240/120 step down transformer and ground one side of
>> the secondary - perfectly safe and legal.
>>
>> If there is any concern about how warm the tranny in the Fender Twin is
>> getting, just place a small fan behind the amp.
>>
>> My god you fuckwits here know how to complicate simple matters.
>>
>
** Of course I am - thouasands of examples prove it.
> but I got 60Hz trannies fried on 50Hz mains.
** Yawnnnnnnn....
..... Phil
Phil Allison
"Jeff Liebermann"
>
> It's fairly easy to build a 50Hz to 60Hz switching inverter.
** Bollocks.
> Start
> with a 230V 50Hz power supply that produces 330VDC. Then run the
> 330VDC through a 60Hz chopper to get a 330VDC peak-to-peak square
> wave.
** What that produces is a 165 volts of DC.
Dickhead.
> Well, maybe this is overkill (and inefficient):
> <http://www.hzfrequencyconverter.com>
** ROTFL !!
>
> Also, I just downloaded the Phase Linear 400 schematic:
> <http://www.schematicsunlimited.com/download.php?manu=phase-linear&file=phase-linear-400-power-amplifier-schematic.pdf>
> and found that the xformer is just a full wave center tapped single
> winding (other than the winding running the pilot lights). You could
> possibly have found a 50Hz replacement for something that simple or
> deviced another +75v/-75v power source.
** The amp works just fine on a standard step down tranny.
Just like 99% of all amps made for 60 Hz power.
..... Phil
Jeff Liebermann
wrote:
>> It's fairly easy to build a 50Hz to 60Hz switching inverter.
>
>** Bollocks.
Correction. It's fairly easy for *me* to build a 50 to 60Hz switching
inverter.
>> Start
>> with a 230V 50Hz power supply that produces 330VDC. Then run the
>> 330VDC through a 60Hz chopper to get a 330VDC peak-to-peak square
>> wave.
>
>** What that produces is a 165 volts of DC.
Oops. I forgot it was for UK power. US power is 117Vrms
Pk-to-peak is 2 * 1.414 * 117Vrms = 330 V Pk-to-pk
Double that for UK power.
> Dickhead.
Judging by your typical acerbic remarks, I'll consider that a relative
compliment.
>> Well, maybe this is overkill (and inefficient):
>> <http://www.hzfrequencyconverter.com>
>
> ** ROTFL !!
Well, it is a bit large, noisy, inefficient, expensive, messy, and
overkill. But, it will do the job.
One could probably just slow down a 60Hz gasoline portable generator
to run at 50Hz, but that would be too easy. I don't think the
generator noise will be heard over the music belched by the typical
Fender guitar amp.
>> Also, I just downloaded the Phase Linear 400 schematic:
>> <http://www.schematicsunlimited.com/download.php?manu=phase-linear&file=phase-linear-400-power-amplifier-schematic.pdf>
>> and found that the xformer is just a full wave center tapped single
>> winding (other than the winding running the pilot lights). You could
>> possibly have found a 50Hz replacement for something that simple or
>> deviced another +75v/-75v power source.
>** The amp works just fine on a standard step down tranny.
> Just like 99% of all amps made for 60 Hz power.
The xformers that burn up are the one's that are operating close to
saturation at 60Hz. That's usually near maximum rated xformer load.
Run those on 50Hz, the core saturates and gets hot. The same xformer,
run with a much smaller load, works just fine.
Phil Allison
"Jeff Liebermann" <je...@cruzio.com> wrote in message
news:11o217hv1uunjji0i...@4ax.com...
> On Mon, 4 Jul 2011 12:17:12 +1000, "Phil Allison" <phi...@tpg.com.au>
> wrote:
>
>>> It's fairly easy to build a 50Hz to 60Hz switching inverter.
>>
>>** Bollocks.
>
> Correction. It's fairly easy for *me* to build a 50 to 60Hz switching
> inverter.
** Grandiose bullshit.
>
>>> Start
>>> with a 230V 50Hz power supply that produces 330VDC. Then run the
>>> 330VDC through a 60Hz chopper to get a 330VDC peak-to-peak square
>>> wave.
>>
>>** What that produces is a 165 volts of DC.
>
> Oops. I forgot it was for UK power.
** You forgot about the DC component - among other crucial errors.
Dickhead.
> Judging by your typical acerbic remarks, I'll consider that a relative
> compliment.
** No it ain't - fuckhead.
>
>>> Well, maybe this is overkill (and inefficient):
>>> <http://www.hzfrequencyconverter.com>
>>
>> ** ROTFL !!
>
> Well, it is a bit large, noisy, inefficient, expensive, messy, and
> overkill. But, it will do the job.
** Totally INSANE.
Like you.
> One could probably just slow down a 60Hz gasoline portable generator
> to run at 50Hz, but that would be too easy.
** Other way around - dickwad.
>>> Also, I just downloaded the Phase Linear 400 schematic:
>
>>** The amp works just fine on a standard step down tranny.
>> Just like 99% of all amps made for 60 Hz power.
>
>
> The xformers that burn up are the one's that are operating close to
> saturation at 60Hz.
** FFS - I know the actual amplifiers.
YOU do not.
Piss OFFFFFFFFFFFFFFFFFF
.... Phil
N_Cook
2-section Black & Decker lawnmower connector and looks almost professional.
Earthing pin set into the side , black epoxied and shrouded over, not quite
so pro looking.