HELP to ID push pull/Single Ende

makokoy · 27th June 2010, 05:02 PM

I purchased a vintage tube amp Columbia yesterday that need repair I need help to ID if this schematic push pull/Single Ended & power amp/integrated

thank you

mctavish · 27th June 2010, 07:28 PM

Tube amps can kill.

The high voltages required are deadly; start slowly and read the stickies first, that way you will have plenty of time to decide how to proceed with your amp.

tubelab.com · 27th June 2010, 08:00 PM

To answer the questions, it is a stereo push pull power amplifier that does not have its own volume control. It was intended for use as part of a larger system, probably a console stereo. The volume and tone controls were part of the matching tuner. It can be used stand alone with the addition of a volume control. It is probably 15 to 30 watts per channel.

This unit used a selenium rectifier in the bias circuit which can release a toxic stink when they fail, which is likely. The capacitors probably need to be replaced too. If this all sounds unknown to you, get the assistance of someone who understands. Just plugging it in will probably blow up some parts.

makokoy · 30th June 2010, 07:58 PM

thank very much tubelab and mctavish
the amp is dead now one channel was working when I bought it.

27th June 2010, 08:00 PM	#3
tubelab.com diyAudio Member Join Date: Jul 2005 Location: South Florida	To answer the questions, it is a stereo push pull power amplifier that does not have its own volume control. It was intended for use as part of a larger system, probably a console stereo. The volume and tone controls were part of the matching tuner. It can be used stand alone with the addition of a volume control. It is probably 15 to 30 watts per channel. This unit used a selenium rectifier in the bias circuit which can release a toxic stink when they fail, which is likely. The capacitors probably need to be replaced too. If this all sounds unknown to you, get the assistance of someone who understands. Just plugging it in will probably blow up some parts. __________________ Too much power is almost enough! Turn it up till it explodes - then back up just a little.

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27th June 2010, 07:28 PM	#2
mctavish diyAudio Member Join Date: Feb 2008 Location: Niederösterreich	Tube amps can kill. The high voltages required are deadly; start slowly and read the stickies first, that way you will have plenty of time to decide how to proceed with your amp.

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