Carver PM-1.5a amp
N_Cook
goo under the TO3 ," insulating" the pins as they were inserted through it
into the TO3 sockets, causing sparking and destruction of that socket and a
load of colateral.
Plenty of info out there
http://stomach.v2.nl/docs/Hardware/ServiceManuals/Carver%20PM-1.5a-PM1200%20
Service%20Schematics-1.pdf
eservice etc
But nowhere can I find the ,no load, quiescent draw from the mains. I have
bypassed / isolated the mains triac board and powering via metered variac to
the transformer direct at these preliminary stages of powerup. Running at 50
percent mains about 0.1 amp current draw and all monitored DC levels match
between channels and clean signal on output and ps rails half expected
values. Increase to 60 percent and draw climbs abruptly to 0.5 amp . So far
quickly returned to 50 percent and nothing obviously overheating. Anyone
happen to know the expected draw?
Meat Plow
Adaptive or commutating power supply. Adds more rail the harder it's
driven.
Rails don't like continuous sine waves. May provide some explanation to
what you are seeing. Also subject to back EMF. Wasn't my favorite amp,
lots of engineering revisions/bulletins.
--
Live Fast, Die Young and Leave a Pretty Corpse
Arfa Daily
"N_Cook" <div...@tcp.co.uk> wrote in message
news:i689pq$kpl$1...@news.eternal-september.org...
May not be a genuine problem that you're seeing. Like you, I always bring
suspect amps up with a variac, but on more than a few occasions, I've seen
amps that just do not like reduced supply input levels, and behave exactly
as you describe, but with no obvious signs of distress from the output
stages. If you (dare to) keep going up, suddenly, everything evens out, and
the input current returns to a more 'normal' level.
Arfa
Phil Allison
"Nutcase Kook"
> But nowhere can I find the ,no load, quiescent draw from the mains.
** When the PSU is operating normally, the AC rms current draw is about
400mA.
> I have
> bypassed / isolated the mains triac board and powering via metered variac
> to
> the transformer direct at these preliminary stages of powerup. Running at
> 50
> percent mains about 0.1 amp current draw and all monitored DC levels match
> between channels and clean signal on output and ps rails half expected
> values. Increase to 60 percent and draw climbs abruptly to 0.5 amp .
** In that mode, 140 volts rms is all you should apply - internal DC rails
will then be close to full rating at idle.
> So far
> quickly returned to 50 percent and nothing obviously overheating. Anyone
> happen to know the expected draw?
** So this vile, autistic cretin has not got a fucking clue what "
magnetising current " is.
Yawnnnnnnnnnnnn..............
..... Phil
Phil Allison
"Meat Plow"
>
> Adaptive or commutating power supply. Adds more rail the harder it's
> driven.
** Bollocks.
There is a triac "dimmer" circuit in the AC voltage feed to the power
ranny - it acts to regulate the ( multiple )DC rails under load.
This allows a very small AC tranny to be used with limitations on duty
cycle.
> Rails don't like continuous sine waves.
** More bollocks.
>May provide some explanation to
> what you are seeing.
** Ever heard of " I mag " with iron core transformers ????
Once the saturation level is reached, it tends to go ballistic.
.... Phil
Phil Allison
"Arfa Daily"
>
> May not be a genuine problem that you're seeing. Like you, I always bring
> suspect amps up with a variac, but on more than a few occasions, I've seen
> amps that just do not like reduced supply input levels, and behave exactly
> as you describe, but with no obvious signs of distress from the output
> stages. If you (dare to) keep going up, suddenly, everything evens out,
> and the input current returns to a more 'normal' level.
** The PM-1.5 will explode if you do this.
..... Phil
Meat Plow
> "Meat Plow"
>
>
>> Adaptive or commutating power supply. Adds more rail the harder it's
>> driven.
>
> ** Bollocks.
>
> There is a triac "dimmer" circuit in the AC voltage feed to the power
> ranny - it acts to regulate the ( multiple )DC rails under load.
>
> This allows a very small AC tranny to be used with limitations on duty
> cycle.
>
>
>
>> Rails don't like continuous sine waves.
>
> ** More bollocks.
Fuck off Phil
Phil Allison
"Meat Plow is a Vile Cunt "
>
>>
>>> Adaptive or commutating power supply. Adds more rail the harder it's
>>> driven.
>>
>> ** Bollocks.
>>
>> There is a triac "dimmer" circuit in the AC voltage feed to the power
>> tranny - it acts to regulate the ( multiple )DC rails under load.
>>
>> This allows a very small AC tranny to be used with limitations on duty
>> cycle.
>>
>>
>>> Rails don't like continuous sine waves.
>>
>> ** More bollocks.
>
> Fuck off Phil
** What a stupid, pig ignorant fucking MORON.
.... Phil
Meat Plow
> What a stupid, pig ignorant fucking MORON.
Yes you are.
Phil Allison
"Meat Plow Needs Shooting "
>
> Adaptive or commutating power supply. Adds more rail the harder it's
> driven.
** Bollocks.
There is a triac "dimmer" circuit in the AC voltage feed to the power
tranny - it acts to regulate the ( multiple )DC rails under load.
This allows a very small AC tranny to be used with limitations on duty
cycle.
> Rails don't like continuous sine waves.
** More bollocks.
>May provide some explanation to
> what you are seeing.
** Ever heard of " I mag " with iron core transformers ????
Once the saturation level is reached, it tends to go ballistic.
You fucking IMBECILE !!
.... Phil
Meat Plow
> There[SLAP]
What's the Aussie words for fuck off?
Oh yeah, fuck off Phil.
Phil Allison
"Meat Plow Needs Shooting "
** Bollocks.
** More bollocks.
You fucking, psychotic IMBECILE !!
.... Phil
Sjouke Burry
> On Thu, 09 Sep 2010 09:21:44 +1000, Phil Allison wrote:
>
>> There[SLAP]
>
>
> What's the Aussie words for fuck off?
>
> Oh yeah, fuck off Phil.
>
>
N_Cook
news:HFOho.57769$45....@newsfe29.ams2...
I had to check whether I'd connected mains to one 120V primary by mistake as
it was that sort of effect but without saturation noise from the
transformer. Will return to it later today and also try engaging the triac
section as I've not got my head around the on demand draw triac instead of
good load/bad load or brownout triac
Phil Allison
> But nowhere can I find the ,no load, quiescent draw from the mains.
** When the PSU is operating normally, the AC rms current draw is about
400mA.
> I have
> bypassed / isolated the mains triac board and powering via metered variac
> to
> the transformer direct at these preliminary stages of powerup. Running at
> 50
> percent mains about 0.1 amp current draw and all monitored DC levels match
> between channels and clean signal on output and ps rails half expected
> values. Increase to 60 percent and draw climbs abruptly to 0.5 amp .
** In that mode, 140 volts rms is all you should apply - internal DC rails
will then be close to full rating at idle.
> So far
> quickly returned to 50 percent and nothing obviously overheating. Anyone
> happen to know the expected draw?
N_Cook
rails and 50 percent values I'd not noticed a blown up and shorted
3900uF,50V electro in the ps. Another 20 minutes getting that sub-board out,
anything to avoid taking the whole amp apart with all those 24 TO3 sockets
demounted , frail soldered-in interboard "headers" etc
Meat Plow
> "Meat Plow Needs Shooting "
Aw, poor wittle Phil popped another aneurysm.
Meat Plow
You want to sodomize me?
Meat Plow
They were not my favorite amp to work on.
Phil Allison
"Meat Plow TROLL Needs Shooting "
** Bollocks.
** More bollocks.
You INSANE fucking IMBECILE !!
.... Phil
Meat Plow
> "Meat Plow TROLL Needs Shooting "
Aw poor queer Phil. Does your poosy hurtz?
David Nebenzahl
> On Fri, 10 Sep 2010 00:58:21 +1000, Phil Allison wrote:
>
>> "Meat Plow TROLL Needs Shooting "
>
> Aw poor queer Phil. Does your poosy hurtz?
You know, Meat Head, you're actually worse than Phil.
At least he has an excuse: he's off his meds. But you're just an asshole
who takes pleasure in calling others names.
--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.
- Comment from an article on Antiwar.com (http://antiwar.com)
Meat Plow
> On 9/9/2010 9:49 AM Meat Plow spake thus:
>
>> On Fri, 10 Sep 2010 00:58:21 +1000, Phil Allison wrote:
>>
>>> "Meat Plow TROLL Needs Shooting "
>>
>> Aw poor queer Phil. Does your poosy hurtz?
>
> You know, Meat Head, you're actually worse than Phil.
>
> At least he has an excuse: he's off his meds. But you're just an asshole
> who takes pleasure in calling others names.
KABOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM! Another irony meter
destroyed.
David Nebenzahl
"Irony meter"? You call what you were attempting to do *irony*?
I always thought you were an idiot, but not that big an idiot. I was
obviously wrong.
Meat Plow
> On 9/9/2010 11:50 AM Meat Plow spake thus:
>
>> On Thu, 09 Sep 2010 11:45:29 -0700, David Nebenzahl wrote:
>>
>>> On 9/9/2010 9:49 AM Meat Plow spake thus:
>>>
>>>> On Fri, 10 Sep 2010 00:58:21 +1000, Phil Allison wrote:
>>>>
>>>>> "Meat Plow TROLL Needs Shooting "
>>>>
>>>> Aw poor queer Phil. Does your poosy hurtz?
>>>
>>> You know, Meat Head, you're actually worse than Phil.
>>>
>>> At least he has an excuse: he's off his meds. But you're just an
>>> asshole who takes pleasure in calling others names.
>>
>> KABOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM! Another irony meter
>> destroyed.
>
> "Irony meter"? You call what you were attempting to do *irony*?
I call 'explosive irony' you crying about name calling and in the same
mewling gasp calling me "Meat Head". Get it? Didn't think so.
David Nebenzahl
Oh, that. That's the best you could come up with?
Hey, if the shoe (or nym) fits, wear it.
David Nebenzahl
That's it? That's all you've got?
Like they say, if the shoe (or nym) fits, wear it.
N_Cook
so re-engaged the triac cct
Now powering up via the mains plug proper, via the on-demand triac, the
mains current is stable at 210mA at 70 percent of 240V . No hotspots but
will take various voltages on ps and both ch, with loads on outputs, before
upping any more.