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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: Chrome Cutie Preamps have .1 uf final cap; not .01...Hum is easily controlled... posted by Interstage Tranny on June 21, 2015 at 08:56:11:
That the schematic provided is favorably wrong is good news. The factor of 10 is important.
IMO, aside from using 7025 equivalents, to control hum, biasing the filament winding's CT off B+, instead of a direct connection to ground, is indicated.
Speaking of B+, replacing the wretched 1/2 wave rectifier with a low noise full wave bridge seems obvious to me. Other than the routine replacement of dried out electrolytic caps., the CRC PSU filter seems quite adequate.
FWIW, I still would not connect the Lafayette preamp to a SS line stage, without adding buffering between the 2 units.
Eli D.
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Follow Ups
- RE: Chrome Cutie Preamps have .1 uf final cap; not .01...Hum is easily controlled... - Eli Duttman 10:47:11 06/21/15 (1)
- RE: Chrome Cutie Preamps have .1 uf final cap; not .01...Hum is easily controlled... - jec@afo.net 14:32:31 06/21/15 (0)
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