RE: Dual 5AR4 input capacitance

Vintage Asylum

Classic gear from yesteryear; vintage audio standing the test of time.

In Reply to: RE: Dual 5AR4 input capacitance posted by Michael Samra on September 17, 2016 at 23:18:57:

Bringing the B+ rail voltage down is easy. Use 5R4s, instead of 5AR4s. Slightly "soften" B+ rise with a CL-90 between the rectifiers and the PSU filter.

Like the KB85, the original Mullard 5-20 employs self biased "finals". Replace R8 with a 10M45S CCS. McShane has New Sensor made 12AY7s.

BTW, Mullard's schematic does not show "death caps." and the KB85 does. The "death caps." must go and a proper, 3 wire, safety grounded, power cord installed.

Eli D.
GE 12AY7 Data Sheet (Open in New Window)

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Follow Ups Full Thread

Topic - Dual 5AR4 input capacitance - gkargreen 17:07:39 09/16/16 (7)

RE: Dual 5AR4 input capacitance - Eli Duttman 19:57:18 09/16/16 (6)

RE: Dual 5AR4 input capacitance - gkargreen 09:41:11 09/17/16 (5)

RE: Dual 5AR4 input capacitance - Michael Samra 14:44:17 09/17/16 (4)

RE: Dual 5AR4 input capacitance - gkargreen 15:21:25 09/17/16 (3)

RE: Dual 5AR4 input capacitance - Eli Duttman 17:12:33 09/17/16 (2)

RE: Dual 5AR4 input capacitance - Michael Samra 23:18:57 09/17/16 (1)

RE: Dual 5AR4 input capacitance - Eli Duttman 05:33:25 09/18/16 (0)

Follow Ups

RE: Dual 5AR4 input capacitance - Eli Duttman 05:33:25 09/18/16 (0)

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