Hello, sorry if this is a bit stupid, i've got an old trio W-46 el84 valve amp with 4 el84's in it. there are .047uf caps that are in output capacitor positions and 3 0.05uf capacitors in there as well, 2 that are near the .047uf ones and attached to valve terminals and one that is elsewhere in the circuit. I have some russian T3 .047uf capacitors that i've replaced all the .047uf ones with. i am very tempted to replace the .05uf caps with T3 .047uf caps as well, but am not sure how critical it is to use exact values.
Can you safely replace 600v .05uf caps with 630v .047uf?
thanks
Can you safely replace 600v .05uf caps with 630v .047uf?
thanks
Go ahead and replace it with what you have. No problem-o. The tolerance on these things is beyond the small marked difference anyway.
The caps are probably +/-20%. One rarely sees +/- 10% in older equipment and +/-5% is virtually unheard of unless it is High End Audiophile.
Using the +/- 20% value would give:
0.05*1.2 = 0.06
0.05/1.2 = 0.0416
So you have a initial value range of roughly 0.042 to 0.60.
Hence, no problem substituting a 0.05 for a 0.47
Using the +/- 20% value would give:
0.05*1.2 = 0.06
0.05/1.2 = 0.0416
So you have a initial value range of roughly 0.042 to 0.60.
Hence, no problem substituting a 0.05 for a 0.47
You might be able to use any PP EL84 schematic to better understand your unit.
The capacitor leading to the grid of each EL84 valve is called a coupling cap.
Sometimes there is a .05uF cap connected between the RCA input and the first resistor.
Best from Tucson Arizona
Bob
The capacitor leading to the grid of each EL84 valve is called a coupling cap.
Sometimes there is a .05uF cap connected between the RCA input and the first resistor.
Best from Tucson Arizona
Bob
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