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Pioneer SX-737 project...capacitor ID needed on control amp

spctrlhrmny

spctrlhrmny

New Member
Hey there. Attempting my first receiver rebuild on a Pioneer SX-737, and I am preliminarily checking components on the boards to the specs in the manual before I start testing, purchasing, and repalcing.

Ran into an issue on the control amplifier assembly board. Specifically, C1 + C2 and C23 + C24. These capacitors are listed as electrolytic, and according to the manual:
C1 - 1 uF 25V
C2 - 1 uF 25V
C23 - 2.2 uF 25V
C24 - 2.2 uF 25V

I have located them but they're unlike any I've seen before. C23+C24 are red and tan with a white spot and C1+C2 are orange/red, black, and tan with a white spot.
Can anyone shed some light on this? Pictures attached
20230907_134441.jpg20230907_134550.jpg
Thanks in advance :)
 
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Welcome to AudioKarma!

What is the issue? Are you wondering how to test them, or wondering if those are in fact capacitors? (they are).

PS - you will likely get more responses if you post this on the Pioneer forum.
 
Thanks!
The issue is that I'm not sure if they're electrolytic capacitors, and also how to properly identify the specs on them (since they're color coded without text)

Thank you! I will do that as well
 
Is there a key to identify this type of tantalum cap by color markings? I'm asking because I've already found a few differences between what is in the unit and the manual. Hard to know for sure without the words on the component!
 
Use film caps on the control amp board. Kemet, Wima are good brands. You can go up in voltage value and you don't have to worry about orientation.

3290.2.JPG.jpgs10-2200p01wj.jpg
 
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