Carver PM-1.5a amp

[N_Cook]

Serious amount of damage on one ch from someone using handfulls of white
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 PM-1.5a-PM1200
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]

Serious amount of damage on one ch from someone using handfulls of
white 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 PM-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?

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.

 

[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"



** 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.




** More bollocks.

**** off Phil

 

[Phil Allison]

"Meat Plow is a Vile **** "

**** 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 **** off?

Oh yeah, **** off Phil.

 

[Sjouke Burry]

There[SLAP]

What's the Aussie words for **** off?

Oh yeah, **** off Phil.

Sodomize Meat Plow. ( you asked for that response

 

[N_Cook]

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

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]

"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

 

[Meat Plow]

"Meat Plow Needs Shooting "

Aw, poor wittle Phil popped another aneurysm.

 

[Meat Plow]

There[SLAP]

What's the Aussie words for **** off?

Oh yeah, **** off Phil.

Sodomize Meat Plow. ( you asked for that response

You want to sodomize me?

 

[Meat Plow]

Very awkward wrapped-up around itself amp to work on. With so many
supply 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

They were not my favorite amp to work on.

 

[Phil Allison]

"Meat Plow TROLL 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 INSANE fucking IMBECILE !!





..... Phil

 

[David Nebenzahl]

KABOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOM! Another irony meter
destroyed.

"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]

"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]

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.

Oh, that. That's the best you could come up with?

Hey, if the shoe (or nym) fits, wear it.