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 Post subject: Help identifying tube amp
PostPosted: Jun Sun 05, 2022 1:09 pm 
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Joined: Jun Sun 05, 2022 12:52 pm
Posts: 1
Can you help me identify this amp so I can get a schematic for it. It is marked 7621 1. Also has a small sticker that says 311. It has 3 tubes- one 12ax7 and two 50c5. I was told it came from a zenith phono


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 Post subject: Re: Help identifying tube amp
PostPosted: Jun Sun 05, 2022 9:02 pm 
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Joined: Jan Thu 01, 1970 12:00 am
Posts: 5891
Location: Macedon NY 14502
May be chassis 3A04, 3Z04 if mono, 3L04, 3L05 if stereo (two output transformers) https://www.radiomuseum.org/r/zenith_hf11l_ch_3a04.html

This is not isolated from the AC power line and an isolation transformer should be used when operating it outside its normal enclosure.

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 Post subject: Re: Help identifying tube amp
PostPosted: Jun Sun 05, 2022 10:05 pm 
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Joined: Jan Tue 31, 2012 12:55 am
Posts: 21841
Location: Bryansford Village. Ireland.
Attached below, Sams Photofact Set-346 Folder-20
for chassis 3Y04


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 Post subject: Re: Help identifying tube amp
PostPosted: Jun Wed 15, 2022 6:29 pm 
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Joined: Mar Sun 27, 2022 10:38 pm
Posts: 29
Location: Kennebunkport, ME
Be careful. This is a hot chassis, powered by line voltage directly. You should add an isolation transformer to protect any equipment you intend to plug into this amp.


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