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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: RE: Grounded cathode / no grid bias 6DJ8 ?! Schematic attached posted by Jim Doyle on March 28, 2011 at 16:49:49:
Jim,
I did not closely at the circuit you posted. If you "smell" overpriced, it probably is. The tweaked RCA circuit I posted employs cathode bias in the 1st gain block and grid leak bias in the 2nd gain block, specifically as a load lightener of the passive EQ network. I also put stopper resistors on both triodes, even though they're low gm. No prisoners taken here. Several "inmates" have built the tweaked RCA setup and the reported result is "highly satisfactory". A possible refinement is CCS loading of the 2nd gain block.
FWIW, the 6SC7 based design GE provided for use with their early mag. carts. uses grid leak bias in both gain blocks and an active RIAA network. That design also relies on the inductance of the cart. for HF roll off.
Eli D.
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Follow Ups
- RE: Grounded cathode / no grid bias 6DJ8 ?! Schematic attached - Eli Duttman 03/28/1117:53:20 03/28/11 (2)
- RE: Grounded cathode / no grid bias 6DJ8 ?! Schematic attached - Gingertube 20:07:21 03/29/11 (1)
- RE: Grounded cathode / no grid bias 6DJ8 ?! Schematic attached - Eli Duttman 17:28:19 03/30/11 (0)
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