30+ year old caps! Help

[jimbo6871]

Hi Guys and thanks for taking the time to read this from a complete novice and total newbie!

I'm working on an old amplifier and I'm stuck with a couple of caps.

Has anyone any ideas what these are and what I could replace them with (photo attached, caps ringed in red) C25 and C23 on the schematic.

I'm totally at a loss with these, I've now got four different value charts all giving different answers and some sites suggesting the meaning and layout of the colour bands has changed over the years!

All help really appreciated.

Thank you
Jim

[Gertjan]

Re: 30+ year old caps! Help

It looks like they are resistors.....
The upper one 10 or 100 Ohms, the lower one 100 kOhms.

Just try to measure them with your Oms meter.

good luck! Gertjan.

[SteveNielsen]

Re: 30+ year old caps! Help

Replace them with the value shown on the schematic, which is 100 pF for both of them. I doubt that it will matter what type cap you use as long as the value is correct.

Capacitor color codes are not as standardized as resistor color codes are.

[JASTECH]

Re: 30+ year old caps! Help

Jim, the 100pF Capacitor is correct via schematic. You could improve on the sound quality by upgrading the caps. To upgrade, Capacitance is only part of the equation. You will need to consider Phase, Magnitude and Impedance.

[stj]

Re: 30+ year old caps! Help

if those are not just part of the power circuits,
you could improve the sound quality by using polystyrene instead of ceramic types.