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In Reply to: Follow up on the sound of Pots. posted by tubesforever on October 4, 2005 at 15:41:08:
With the vintage of this preamp, it may be those are not Black Beauties in it. Is this a late 80's preamp?
Seems to my memory that the BB's hit the market in the early 90's. Before that the Blue Velvet's were the best Alp's available.
It is great that they designed the unit to use linear pots. Most who compare find they track much better than the normal log pots.George
Follow Ups:
This is a 25k ohm pot part number 952B "made in japan".I think these are the black beauty model. If you send me an email address I will shoot you over some pictures of them.
jim_howard_pdx@yahoo.com
Cheers!
They may be. Someone may have swapped them out. I though Precision Fidelity went out of business in the 80's. Maybe not. These were pretty high dolar pots for a mass produced item anyway. Most have a 3 dollar pot, not a 30 dollar.
One way to check the BB is the size, they are 40 mm square. I have a stereo one up in the attic, need to look at it.
The pot should be a log, and 25K is low for a tube preamp. Most tube preamps have a 50K or 100K. Reason is the loading on the phono stage. Most tube phono stages like a high load. Have a Croft Epoch that uses 1 meg pots. Thank is an extreme example.George
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