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In Reply to: Replaced 33pf 1500v with what posted by tnc on April 9, 2007 at 17:36:07:
These caps are likely just supressing ultrasonic instabillity. Just get modern ceramic replacements and do not worry about their sonic impact.
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Long Live Dr.Gizmo
Follow Ups:
...you coul dbe pleasantly surprised.And are they really being subjected to such high voltages - or is that what the manufacturer happen to have in his parts storage so he used them?
"Maybe it will work perfectly with them remove..."
You mean just put a piece of wire in place of the caps. That sound like a great idea since the caps are such small value anyway.... can it damage the amp in anyway. I may just do that if doing this wont cause any fire :-)
Remove means r-e-m-o-v-e, as in take out, unsolder and pull out - not short out with a wire!REplace a cap with a wire and smoke, flames and bad smells will arise...at the very least the music will die.
As Steve O says below - best you LEAVE IT ALONE untill you understand a LOT more than it seems you do now.
The very most you should be doing at this point is to CONSIDER removing the caps and not replacing them with anything. With all due respect to those who have provided advice so far, it's my opinion that shouldn't do anything at all till you understand EXACTLY what those caps are doing in your circuit. It's pretty clear that you don't really understand your circuit and you haven't provided enough details about your amp or its circuit for anyone else to give you sound advice.My concern arises from the voltage rating of the cap. 1500V is not a trivial value and it's extremely doubtful that this rating would have been specified w/o good reason. A couple of typical uses for a cap of this value and voltage rating would be 1. A corrective feedback compensation cap taken from primary of opt back to a low level stage, 2. As cap placed across 1/2 of a PP primary to equalize winding capacitance. In either case high DC voltages will be present and if high level AC signals are present, the peaks will be superimposed on top of the DC. Personal safety and/or component failure are at risk here.
Bottom line IMO is don't do anything till someone understands what the cap's function really is. Also, you may not achieve any improvement by replacing the cap. Depending on the type of ceramic (unknown at this time) it may not be as bad as the true believers would have you think.
NO - you need to look where they are in the circuit but they are most likely high frequency supression caps and need to be taken out completely (Replaced with an open circuit). If you just replace them with a bit of wire there is a BIG chance you WILL cause a fire.
Trace your circuit first.
Cheers,
Ian
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