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RE: Bell 6060 Preamp Section

Posted by Eli Duttman (A) on October 10, 2014 at 21:22:52

In Reply to: RE: Bell 6060 Preamp Section posted by SteveBrown on October 10, 2014 at 12:48:15:

Steve,

Every now and then, tone controls can be of use. To avoid fouling the vast majority of recordings up, tone control circuitry needs to be 100% defeatable and (preferably) "unity" gain.

The attached Max Robinson design, a Baxandall implementation, is "unity" gain. As shown, it's not practical. 4X 12AX7s are needed for a stereo setup. :>( Fortunately, it's not particularly difficult to replace the cap. coupled 'X7 cathode followers with DC coupled ZVN0545A source followers. Now, the bottle count is 1/channel and the number of caps. in the signal path is reduced. :>)

BTW, AC heating should be fine, if the Sovtek 12AX7LPS is used in Max's setup. The 'LPS is a genuine 7025 equivalent that contains a hum bucking, spiral wound, heater.


Eli D.

• ZVN0545A Data Sheet   (Open in New Window)

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