Question about Carver PM950 Amplifier
I have a Luxman LV 105 Amplifier that sudden gone dumb. It is one driven buy both tubes and FET's. I open it up with power on, I found:
the LED's on the board glow,
the heat sink warms up,
and the tubes, visible from outside, glow too,
no hissssssss from any input gangs (phones, tapes, aux...) even with volume control turned to max.,
Can anyone suggest to me what might probably gone wrong and where I should start to probe the problem?
Can anyone offer me a copy of the maintenance manual?
(note: this model is 220v. Version LV 105, not LV 105u of which I have a copy).
Hi: If the Amp has an audio output transformer, check for bad solder connections to the pc board, This are the wires from the transformer to the PC board. Another place to look is the earphone connection plug. If the jack has a bent contact inside of it, you will have all sound cut off. Good Luck.
Posted on Mar 13, 2008
Dumb questions first...
Is the Tape monitor on?
Speakers properly connected?
Less dumb questions..
The tubes have high-voltage on them . Upwards of 450VDC.
DO the proper voltages appear on the high voltage pins on the tube sockets?
AND WATCH OUT FOR YOUR FLESH coming in contact with HIGH Volts DC . It can cause death.
If the only difference between the LV-105 and LV-105U is the line-in volts then you can use the 105U schematic for everything after the power transformer.
Posted on Mar 10, 2008
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Posted on Jan 02, 2017
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Dec 04, 2010 | Carver PM950 Amplifier
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