Depends on the transformer winding resistance. Use PSUD from duncanamps.com to see if the repetitive peak current is within the tube's rating. With a wimpy transformer, 100 uF would be fine. With a low DCR 9considerably oversize...), 4 uF may be it.
Note that the 4 uf is a "typical operation" value not a maximum. In the RCA
receiving tube manual (1950) they have typical capacitance at 10 uF, but then
show a circuit for a 25W 6L6 AB1 amp which has a 5U4-G followed by 40 uF.
As was noted, the real maximum limit is the instantaneous current, which
for this tube is around 2.3 amps, so the real limit depends on the plate-to-plate
impedance through the transformer.
receiving tube manual (1950) they have typical capacitance at 10 uF, but then
show a circuit for a 25W 6L6 AB1 amp which has a 5U4-G followed by 40 uF.
As was noted, the real maximum limit is the instantaneous current, which
for this tube is around 2.3 amps, so the real limit depends on the plate-to-plate
impedance through the transformer.
alexg said:
Depends on how much current you're pulling, and how much ripple you can stand. Why use a 5U4G anyway? The 5U4GB has a much higher Isurge rating.
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