Hoffman Amplifiers Tube Amplifier Forum

Amp Stuff => Tube Amp Building - Tweaks - Repairs => Topic started by: Captain chunkulus on April 30, 2021, 10:05:48 am

Title: Marshall 9005 stereo power amp issues.
Post by: Captain chunkulus on April 30, 2021, 10:05:48 am

So,  I picked up this 9005 stereo power amp. I need it had issues however I figured an output tranny or tube or something. Thus far I've  that it seems to have an after market power tranny. There is only 1 stand by switch wired. It. Looks like they wired the standbys to just one switch. Just trying to figure out the lay of the land how to put this back as a true stereo 50 watt aside power amp.

Title: Re: Marshall 9005 stereo power amp issues.
Post by: Captain chunkulus on April 30, 2021, 10:07:06 am

More pics.

Title: Re: Marshall 9005 stereo power amp issues.
Post by: sluckey on April 30, 2021, 10:10:24 am

My first step would be to find a schematic.

Title: Re: Marshall 9005 stereo power amp issues.
Post by: Captain chunkulus on April 30, 2021, 10:21:53 am

Here it is.

Title: Re: Marshall 9005 stereo power amp issues.
Post by: sluckey on April 30, 2021, 11:01:33 am

I see the problem. You're missing an entire channel!   :wink:

Title: Re: Marshall 9005 stereo power amp issues.
Post by: Captain chunkulus on April 30, 2021, 11:38:22 am

Lol. 

Title: Re: Marshall 9005 stereo power amp issues.
Post by: Captain chunkulus on May 10, 2021, 08:41:26 am

Got it sorted out.  Bad output transformer on the right side.