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 Post subject: Ampex output transformers for DIY amp build
PostPosted: Jun Sun 02, 2019 6:55 pm 
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Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1157
Location: Albion, CA, USA, 95410
Hi All,

I am starting to gather up parts and pieces to build a stereo amp. I have a couple of Ampex 2010 suitcase amplifiers and I am looking at pirating the output transformers. Are these of decent quality? They are marked 58-0005-D. They are good to use with 6V6's and I have a few of those kicking around. They appear to only be rated for 10 watts, a little less than I might want but truly 20 watts of sound is more than I actually need.

Thanks!


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Sun 02, 2019 8:42 pm 
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Joined: Sep Tue 15, 2015 1:16 am
Posts: 532
Location: 18424 PA
Those ampex are worth about $200 each. You would be better off buying the transformer you need and selling those.


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Sun 02, 2019 8:57 pm 
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Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1157
Location: Albion, CA, USA, 95410
Hmm. Mine are a little beat up, or rather one is decent and the other not so much. I live in the middle of nowhere so selling them would be something for that auction site we all love. I'm not sure I want to deal with that but I might.


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Tue 04, 2019 12:06 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 8821
Location: Beaver Falls, PA. USA
If you want 20 watts, you might be better off using 6L6 tubes.

_________________
Tim KA3JRT


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Tue 04, 2019 1:35 am 
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Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1157
Location: Albion, CA, USA, 95410
Maybe I am not up on amplifier terminology. 10 watts per side would be a total of 20 watts, no?

Still curious as to the quality of these output transformers.


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Tue 04, 2019 1:33 pm 
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Joined: Jul Mon 08, 2013 2:48 pm
Posts: 349
Quality is average and you only have a single secondary, very likely for a 16 ohms speaker impedance. This transformer would be best suited for a guitar amp, there are many better OPT's available for Hi-Fi use. The 2010 circuit used a special global feedback network to compensate for speaker/enclosure/amplifier deficiencies and tailoring the sound.The transformers used on the little Ampex 6973 console amps are much better but it would be a pity to part out these amps.


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Tue 04, 2019 3:15 pm 
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Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1157
Location: Albion, CA, USA, 95410
Thanks for the information. I may have to reconsider my plan. However, I really don't know how I would get these back into the hands of someone who would use them. For sure "local pick up" isn't going to happen, I live 2-3 hours away from anywhere it might.

If I was to try to sell them, should I re-cap and get them going or sell as is? I am very unfamiliar with the audio market.


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 Post subject: Re: Ampex output transformers for DIY amp build
PostPosted: Jun Wed 26, 2019 11:51 pm 
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Joined: Aug Thu 20, 2015 3:09 pm
Posts: 1157
Location: Albion, CA, USA, 95410
OK, I couldn't bring myself to gut them. I re-capped one of them and it sounds pretty good. I bought the caps for the other but haven't dug into that one yet. Turns out these need line level input so not much good for a guitar unless you used a pre-amp. I think I'll use this one for parties out in the garden.


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