Replacing Bass Electronics

[Winetree]

This is a picture of the electronics of a Peavey T-40 bass.
I want to upgrade the capacitors.  The .01uf discs will be wimas.
The  components that look like resistors are shown to be capacitors in the schematic.
At first I thought they were resistors. They are .022 and .033ufs.
What type of caps would be a good replacement?

 

[pucho812]

why are you wanting to change the caps?

 

[Winetree]

That's a picture I took off the internet. When I disassembled mine I found one of the resistor shaped capacitors was removed and needs to be replaced. Also after their being 34 years old,  and disassembled, I thought I'd replace all 4.
 

 

[pucho812]

Fair enough...

The amp tone chasers swear by sozo caps Might sounds quite good in a bass

 

[Patrick from Davis]

I have never found that the different caps have too much effect on the sound in a bass or guitar.  Except I do not like ceramic caps, they tend to behave like a switch between pillow on the amp and no effect to my ears.  For fun I got some film caps (Tropical fish caps on eBay) and went through a bunch of values to see the effect.  I get more useable range with a smaller cap.  So in a guitar with humbuckers, 500K pots and a 0.018 uF are what sounds good to me.  The roll off of high frequencies is not nearly as sudden.  I have not messed around with a bass doing this, but I need to add a tone circuit to one of my basses.  So the easiest is to get some alligator clip leads and just find what you like. 
Patrick

 

[JohnRoberts]

Those Peavey caps were widely used inside Peavey because they could be machine inserted into PC boards side by side with resistors. They may have been film but wouldn't swear by it, could be ceramic.

If you want to replace polyester film should be decent, NPO or COG ceramic will be clean.

JR

 

[dmp]

I got a bunch of Gudeman PIO caps that sound very good in my experience. Tried them in a PBass and several telecasters and there's a very noticeable improvement over cheap ceramics.