AudioClassics LTD needs your help identifying this! - AVS Forum
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post #1 of 8 Old 06-13-2013, 07:33 AM - Thread Starter
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Hi all,

We had an item a customer brought in and we believe it to be a Phono stage or Pre-amp of some sort but are a bit baffled. Can someone help giving us information for identification!? We'd really appreciate it.





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post #2 of 8 Old 06-13-2013, 09:36 AM
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Welcome ... I'm a big fan of your store. What are the connections on the back and are the transformers and switch part of the power circuit?

The lazy man finds the easiest way ... Ben Franklin
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post #3 of 8 Old 06-13-2013, 09:51 AM - Thread Starter
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Thank you for the kind comment! We always appreciate it.

The unit has gold RCA inputs. That's all we can see.

And yes - they are together. It seems like a separate transformer for each channel.
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post #4 of 8 Old 06-14-2013, 12:41 PM
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If you can find out what tubes it uses, that may give an indication of its use.....
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post #5 of 8 Old 06-15-2013, 04:09 PM
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I'm with you, my best guess would be a "variable" (?) phono preamp. It's hard for me to judge it's size but It seems overly large and robust. Is there any chance it could have sat under a turntable as a sort of stand. If not it looks like it was made to have something sit on it. Maybe a power amp that it was feeding. Looking at the cap's and having "gold" RCA's it doesn't seem really that old ... maybe 80's. Whoever built it knew their stuff judging from all the components they used. It seem fairly complex for a homemade job. They could have been copying a schematic of a factory made product hence the large layout. Without knowing what tubes it was designed to use you may never know for sure how it works / sounds.

If it had 2 sets of inputs and outputs I would have though it was a preamp / mixer for 2 turntables.

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post #6 of 8 Old 06-15-2013, 05:04 PM
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My guess is that it would use either 12ax7, 12au7, etc.. http://en.wikipedia.org/wiki/12AX7
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post #7 of 8 Old 06-17-2013, 06:55 AM - Thread Starter
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Thank you all for your input. We cannot figure out what kind of tubes it uses at this time. You all have been very helpful! Thank you!
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post #8 of 8 Old 06-18-2013, 01:28 AM
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Good grief!, now i'm obsessing on what the tube complement this thing was supposed to have........eek.gif
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