Fault-finding a Yaesu FL-2100B, and source of 572Bs....?
G4KFK
Any FL-2100B experts here?
This one in front of me has one tube completely missing, and the other
is an unknown quantity.
Sorry if I'm waffling here, but here's what I'm seeing...
The DC conditions seem OK. Standing current is about 50mA, which is
probably about right with only one tube.
Driving it with 5W of FM from the FT-817, I get no increase in anode
current and no output at all on 80m or 40m
I can drive it to about 100mA anode current on 20m, 15m and 10m. The
anode dip isn't visible (even with the load set to minimum), but the
power output can be peaked. I doubt it's producing any more out than
I'm putting in, but the anode voltage is dropping visibly as the RF
output peaks.
The loading control does have an effect on the output power, so I
assume that proves the bandswitch contacts are still OK?
The FT-817 seems happy with the input matching - the SWR warning isn't
coming on.
Can a 572B be so duff that it only produces a couple of Watts out for
200W DC input?
To be honest, these things scare me s***less. Having once been on the
wrong end of the 600V anode supply of a 19 set's 807, I don't fancy
the 2.4kV in this thing :-)
Best price I've seen is £85 plus £5 postage for a new pair of 572Bs.
Anybody know of any cheaper sources. They don't even have to be new,
as long as they work well enough for me to get on with faultfinding.
73
Mike / G4KFK
Lurcherman
Mike, thats about right for a pair on new tubes, You do see them
cheaper on e bay. I have bought `Golden Dragon' brand direct from
China with no problems. Regarding what you are seeing, I do not
believe that you will see much at all with only one valve, the grid
and anode tuning will be all over the place, it does sound as if your
second tube is soft though. The PA Volts do drop as you draw current,
they are not the more sophisticated of power supply.
I no longer have my amp, but when they work they easily do the legal
limit and command fairly high prices for a 25 year old bit of kit. If
you want someone to sort it out Peter G3ZRS is doing amp repairs (Ad
in Rad Com)
Cheers Tim M0AFJ/G8GGP
G4KFK
>
> Mike, thats about right for a pair on new tubes, You do see them
> cheaper on e bay. I have bought `Golden Dragon' brand direct from
> China with no problems. Regarding what you are seeing, I do not
> believe that you will see much at all with only one valve, the grid
> and anode tuning will be all over the place, it does sound as if your
> second tube is soft though. The PA Volts do drop as you draw current,
> they are not the more sophisticated of power supply.
> I no longer have my amp, but when they work they easily do the legal
> limit and command fairly high prices for a 25 year old bit of kit. If
> you want someone to sort it out Peter G3ZRS is doing amp repairs (Ad
> in Rad Com)
Thanks Tim
It was G3ZRS' that I saw advertised at £85, and I think they were
Golden Dragons. I'll treat it to a pair of those, see what happens...
I've had a pair of Golden Dragon 6146s in the FT-901 for a few years,
and they've been OK.
73
Mike / G4KFK
Fuller Fan Club@sgt.co.uk.com Paul Georgeson
"G4KFK" <mike.ga...@googlemail.com> wrote in message
news:8310f150-e3d2-430b...@30g2000yqu.googlegroups.com...
Sorry for the on-topic post :-)
Any FL-2100B experts here?
Have you tried G4SDW, Mike?
G4KFK
wrote:
> "G4KFK" <mike.gatherg...@googlemail.com> wrote in message
Fortunately I have the manual :-)
Will
<<To be honest, these things scare me s***less. Having once been on the
wrong end of the 600V anode supply of a 19 set's 807, I don't fancy
the 2.4kV in this thing :-) >>
A wise man - the first sentence.
A ploy that will put you in good standing when working on these amps.
That said, sounds now like you are on you're way to a useful linear.
Remember GIYF, there's a lot out there and if find some of the "mods" people have done it'll show what was normal for these amps.
G4KFK
Thanks Will
This one seems to be unmodified, other than being short of one bottle.
Do you know if they can be persuaded to work on 30m easily? Easily =
without wrecking the front panel by drilling for additional switches.
Brian Morrison
G4KFK <mike.ga...@googlemail.com> wrote:
> To be honest, these things scare me s***less. Having once been on the
> wrong end of the 600V anode supply of a 19 set's 807, I don't fancy
> the 2.4kV in this thing :-)
Quite rightly. If you had been exposed to a direct 2.4kV belt then you
wouldn't be typing to us here.
--
Brian Morrison
Spike
Brian Morrison wrote:
A Radio Amateur friend of mine once fancied constructing a laser, and
during the early trials the home-made power supply shot 35 kV up his
arm - but he lived to tell the tale.
--
from
Aero Spike
Not a member of the RSGB since 1959
Lurcherman
The only way to do that would be to modify the 40M taps, you will
loose 40 though, you could get hold of a couple of vacuum relays to
swith in some extra L off the 20M section, with a switch on the back
panel. The FL2100Z just has more switch positions and extra taps on
the coils.
It is wise to take care, I was working on a 2500W Broadband Amp which
has 1400V at 12A capability on the anodes, looking for one of the
valves which had an intermittent grid short, lights off, HT on,
customer walks in the room, I caught the HT on my little finger, smell
of cooked flesh and a preminent scar!!, all good fun.
GI7B
list on there but will happily send to the UK.
I have a pair of these in a KW1000 linear and they work fine.
GI7B
Fuller Fan Club@sgt.co.uk.com Paul Georgeson
"GI7B" <OC...@yahoo.co.uk> wrote in message
news:hjc9bh$ip0$1...@news.albasani.net...
> If you look on ebay try ebay.com , most of the hong kong sellers only list
> on there but will happily send to the UK.
>
> http://cgi.ebay.com/MATCHED-PAIR-2-NEW-572B-TUBES_W0QQitemZ120454210817QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item1c0ba16501
>
> I have a pair of these in a KW1000 linear and they work fine.
>
liquid bottle, jam jar, rusty gate hinge and some toe-nail clipping...
Brian Morrison
It's volts that jolts, but mils that kills!
I had a belt off a 2.5kV 600mA-capable supply, but it wasn't at full
welly I'm certain as I was holding an insulating trim tool at the time.
I remember finding myself on the other side of the room I was in,
without being able to work out how I'd got to be sitting down in the
corner furthest from the bench the kit was on.
I've never forgotten that warning.....
--
Brian Morrison
Peter Day
> Brian Morrison wrote:
> A Radio Amateur friend of mine once fancied constructing a laser, and
> during the early trials the home-made power supply shot 35 kV up his
> arm - but he lived to tell the tale.
It's volts that jolts and mills that kills ....
luc...@eternal-flames.gov
Cl...@Sgt.co.uk.com> wrote:
>
>"GI7B" <OC...@yahoo.co.uk> wrote in message
>>
>> I have a pair of these in a KW1000 linear and they work fine.
>>
>A _Real Ham_ would easily construct those, using only an empty washing up
>liquid bottle, jam jar, rusty gate hinge and some toe-nail clipping...
With some sticky backed plastic and a small aubergine.
luc...@eternal-flames.gov
wrote:
>A Radio Amateur friend of mine once fancied constructing a laser, and
>during the early trials the home-made power supply shot 35 kV up his
>arm - but he lived to tell the tale.
I'll bet that made his eyes light up. :-)
Nick.
G4KFK
>
> I have a pair of these in a KW1000 linear and they work fine.
Thanks - but did you get clobbered for the import duty and VAT?
G4KFK
wrote:
> "GI7B" <O...@yahoo.co.uk> wrote in message
>
> news:hjc9bh$ip0$1...@news.albasani.net...> If you look on ebay try ebay.com , most of the hong kong sellers only list
> > on there but will happily send to the UK.
>
>
> > I have a pair of these in a KW1000 linear and they work fine.
>
> A _Real Ham_ would easily construct those, using only an empty washing up
> liquid bottle, jam jar, rusty gate hinge and some toe-nail clipping...
.... with gusto!
Fuller Fan Club@sgt.co.uk.com Paul Georgeson
>
> I have a pair of these in a KW1000 linear and they work fine.
Thanks - but did you get clobbered for the import duty and VAT?
Within the last four months, I've imported three items from the States, all
over �70 in value and they've all arrived without incurring VAT or Duty.
Seems it's not worth the paperwork involved...
GI7B
charged with vat on the way in but most low value items are probably not
worth the effort. Even with the vat and handling fee USA prices are
looking better than the UK dealers.
GI7B
Bill
Morrison <b...@fenrir.org.uk> writes
>I remember finding myself on the other side of the room I was in,
>without being able to work out how I'd got to be sitting down in the
>corner furthest from the bench the kit was on.
>
>I've never forgotten that warning.....
>
Had the same myself a couple of years ago Brian, that was only from 240V
ac mains! Apparently quite a spectacular, but short, flight.
PS if you hear a phantom whisperer on GB3BF it will be me, I've lost my
voice!
--
Bill
Ian Jackson
luc...@eternal-flames.gov writes
What? No belly-button fluff?
--
Ian
luc...@eternal-flames.gov
<ianREMOVET...@g3ohx.demon.co.uk> wrote:
>What? No belly-button fluff?
Never had one.
Nick.
G4KFK
> On 22/01/2010 14:52, Paul Georgeson wrote:> "G4KFK"<mike.gatherg...@googlemail.com> wrote in message
Thanks - I just ordered a pair. I'll let you know how I get one when
they arrive.
73
Mike G4KFK
Brian Morrison
GI7B <OC...@yahoo.co.uk> wrote:
> No import duty and the vat man missed them,
Well do remember that duty is zero rated on amateur radio related items.
There is some information on it available on the Flight Refuelling
amateur radio society web site, giving the relevant customs codes to be
used.
--
Brian Morrison
Brian Morrison
Bill <Bi...@birchnet.demon.co.uk> wrote:
> PS if you hear a phantom whisperer on GB3BF it will be me, I've lost
> my voice!
Damn careless of you, shall we send round a search party?
--
Brian Morrison
Brian Morrison
A laser? That'll be the "remaining eye" lighting up will it?
--
Brian Morrison
Ian Jackson
Morrison <b...@fenrir.org.uk> writes
number' on the shipping documents?
--
Ian
Len GM0ONX
I got a GS35B from Russia and a RF Power block from the USA without
being asked for duty or VAT. It just your luck as I know others that have.
Brian Morrison
Ian Jackson <ianREMOVET...@g3ohx.demon.co.uk> wrote:
> >Well do remember that duty is zero rated on amateur radio related
> >items.
> >
> >There is some information on it available on the Flight Refuelling
> >amateur radio society web site, giving the relevant customs codes to
> >be used.
> >
> Don't you need to ensure that the sender quotes the relevant 'magic
> number' on the shipping documents?
In theory yes, but I see the OP has placed an order already....
--
Brian Morrison
Bill
Morrison <b...@fenrir.org.uk> writes
It would be appreciated, St Bernard with large barrel would be fine,
thanks.
--
Bill
Brian Reay
news:OZoyT6ON...@birchnet.demon.co.uk...
A "Fisherman's Friend" is the best thing (seriously). Teachers are very
reliant on their voices and are also exposed to germ laden fomites in large
quantities ;-)
--
73
Brian G8OSN/W8OSN
www.g8osn.net
GI7B
> On Thu, 21 Jan 2010 16:15:47 -0800 (PST), G4KFK
> <mike.ga...@googlemail.com> wrote:
>
>> Can a 572B be so duff that it only produces a couple of Watts out for
>> 200W DC input?
>>
>> To be honest, these things scare me s***less. Having once been on the
>> wrong end of the 600V anode supply of a 19 set's 807, I don't fancy
>> the 2.4kV in this thing :-)
>>
>> Anybody know of any cheaper sources. They don't even have to be new,
>> as long as they work well enough for me to get on with faultfinding.
>
> A _REAL_ radio ham would use an 811A in place of a 572B. I couldn't
> swear to it, but I think they are pretty much drop-in interchangeable.
> I recently bought some 811A valves for about �15 each from a place in
> Bridgend, S. Wales. They are Chinese and seem fine. I use them in my
> Linear Amp UK 811H amp. Search on eBay for 811A and you will find
> them.
>
> 73 de G3NYY
>
The 572B can be used in place of the 811 but not the other way around,
the 811 is rated for about 1.5KV and will melt with 2.4KV.
If you put the 572B valves in your 811H amp they will last a lifetime as
they will be so under stressed (and take a bit of abuse when tuning).
If only I could find a cheap 3-500Z for my HUNTER for this sort of
money, it's just developed a cathode to grid short;c( , I'm running it
with a 4-250 tetrode until I can find a replacement....
GI7B
G4KFK
wrote:
> In message <20100122165032.00006...@surtees.fenrir.org.uk>, Brian
>
> >> No import duty and the vat man missed them,
>
> >Well do remember that duty is zero rated on amateur radio related items.
>
> >There is some information on it available on the Flight Refuelling
> >amateur radio society web site, giving the relevant customs codes to be
> >used.
>
> Don't you need to ensure that the sender quotes the relevant 'magic
> number' on the shipping documents?
I'll risk it - the chances of getting Mr eBay Chinaman to write the
correct commodity code on the invoice are pretty slim.
It's the VAT that's the bigger problem, anyway.
G4KFK
> On Thu, 21 Jan 2010 16:15:47 -0800 (PST), G4KFK
>
> >Can a 572B be so duff that it only produces a couple of Watts out for
> >200W DC input?
>
> >To be honest, these things scare me s***less. Having once been on the
> >wrong end of the 600V anode supply of a 19 set's 807, I don't fancy
> >the 2.4kV in this thing :-)
>
> >Best price I've seen is 85 plus 5 postage for a new pair of 572Bs.
> >Anybody know of any cheaper sources. They don't even have to be new,
> >as long as they work well enough for me to get on with faultfinding.
>
> A _REAL_ radio ham would use an 811A in place of a 572B. I couldn't
> swear to it, but I think they are pretty much drop-in interchangeable.
> I recently bought some 811A valves for about 15 each from a place in
> Bridgend, S. Wales. They are Chinese and seem fine. I use them in my
> Linear Amp UK 811H amp. Search on eBay for 811A and you will find
> them.
A _REAL_ radio ham would read the specs for the 811A first :-)
G4KFK
> On 22/01/2010 20:40, Walt Davidson wrote:
>
>
>
> > On Thu, 21 Jan 2010 16:15:47 -0800 (PST), G4KFK
.... and 811A's cannot be mounted horizontally, like what they is in
the FL-2100B.
Ian Jackson
<b86dd1fb-9188-4298...@l11g2000yqb.googlegroups.com>,
G4KFK <mike.ga...@googlemail.com> writes
>
>
>A _REAL_ radio ham would read the specs for the 811A first :-)
But a real RADIO AMATEUR never reads specs.
--
Ian
Len GM0ONX
Or loading up instructions for a valve PA!
Jimbo on the netbook ...
>as long as they work well enough for me to get on with faultfinding.
>73
>Mike / G4KFK
stick it on ebait....it is well sort after by CBrs like Len ......
doug
"Ian Jackson" <ianREMOVET...@g3ohx.demon.co.uk> wrote in message
news:0Z7oNpBU...@g3ohx.demon.co.uk...
A `real` radio amateur would concentrate on improving his/her antenna
system,instead of indulging in a `pissing` contest with this obsession with
QRO. Changed days indeed! When I got my callsign 50 years ago, normal
procedure then was to use as little power as possible to have QSO`s.!
Grumpy mode `off` now! Doug in sunny Glasgow
luc...@eternal-flames.gov
<mike.ga...@googlemail.com> wrote:
>A _REAL_ radio ham would read the specs for the 811A first :-)
A _REAL_ radio amateur doesn't need bucket loads of power. ;-)
Nick.
G4KFK
> "Ian Jackson" <ianREMOVETHISjack...@g3ohx.demon.co.uk> wrote in message
>
> news:0Z7oNpBU...@g3ohx.demon.co.uk...
>
> > In message
> > <b86dd1fb-9188-4298-a3dc-f8a3b2a61...@l11g2000yqb.googlegroups.com>, G4KFK
> > <mike.gatherg...@googlemail.com> writes
>
> >>A _REAL_ radio ham would read the specs for the 811A first :-)
>
> > But a real RADIO AMATEUR never reads specs.
> > --
> > Ian
>
> A `real` radio amateur would concentrate on improving his/her antenna
> system,instead of indulging in a `pissing` contest with this obsession with
> QRO. Changed days indeed! When I got my callsign 50 years ago, normal
> procedure then was to use as little power as possible to have QSO`s.!
A _REAL_ radio amateur is planning to drive this FL-2100B with his
FT-817, and even then, only when he needs it :-)
Len GM0ONX
No need to be nasty Jim. I reckon you'll have spent more time listing to
CB in an average year that I have in a lifetime by a factor of many times.
G4KFK
We all know of at least one Jeefaw who can't cope with a valved PA
stage. How long would it last in the hands of a CBer?
Jimbo on the netbook ...
>> stick it on ebait....it is well sort after by CBrs like Len ......
>
> We all know of at least one Jeefaw who can't cope with a valved PA
> stage.
>
i would have used the same ploy if i were selling dodgy gear on
ebait........like can't test it because i have no 13 amp sockets in my
house.......
G4KFK
Just a follow-up to this. The 572Bs from China (ebay qmall) arrived
yesterday. One of the "matched pair" was s/c from grid to cathode/
heater.
They have responded quickly to the complaint, but they want me to send
them back. So 5 weeks to get here, 5 weeks back to them (?), and
another 5 weeks for the replacements. Oh dear....!
Jimbo in the HF radio shack...
and get a pair? .....
Jimbo in the HF radio shack...
G4KFK
<jim.gm4...@ntlworld.com> wrote:
> Could you not just nip down to Bentley's elecrical department in Bracknell
> and get a pair? .....
Do you mean Bentalls?
Jimbo in the HF radio shack...
"G4KFK" <mike.ga...@googlemail.com> wrote in message
news:e3912556-5f92-4fcd...@e1g2000yqh.googlegroups.com...
yes sorry ...and what about that Indian fancy goods shop at the corner?
......
G4KFK
<jim.gm4...@ntlworld.com> wrote:
> "G4KFK" <mike.gatherg...@googlemail.com> wrote in message
They're well dodgy. They are selling 1.2GHz wireless video infra-red
cameras, transmitter and receiver kits for £39.99
No CE mark on the packaging, and I'm sure they're not legal.
Jimbo in the HF radio shack...
> yes sorry ...and what about that Indian fancy goods shop at the corner?
> ......
>They're well dodgy. They are selling 1.2GHz wireless video infra-red
>cameras, transmitter and receiver kits for �39.99
>No CE mark on the packaging, and I'm sure they're not legal.
yes...but what can you do?...can you pick one up for me?....no...it's OK I
will get my brother to get me one.....