C1 & C2 are a voltage Doubler. This doubles the B+ voltage to a higher voltage so the tubes can use it efficiently.
C3 & 4 are the MAIN FILTER CAPS. They are your HI VOLTAGE FILTERS from AC to DC after the rectifier.
- C5, C6 Phono section coupling caps
- C7, C8, Coupling caps from output of Phono section
-C13, C14 Coupling caps between sections of the tone section
- C25, C26, Output coupling caps
-C27, C28 Output coupling caps
- C33 snubber cap in the rectifier/voltage doubler
These are all either POWER SUPPLY CAPS, OR SIGNAL PATH COUPLING CAPS. These are the most important of any caps in the X-100-B. And probably the majority. One of the signal path caps goes BLEUWY and you lose a channel. Or if one of the Main Filter caps or one of it's sections goes out, you either lose the amp totally or most of it. They can also short and kill it. Plus the new caps have a higher heat tolerance than those in the early 60's. The one's in there have been cooked for going on 55-57 years so they could be pretty well ready for replacement. Electrolytics (filter can's) should be replaced every 20-30 years or when you notice them heating up more than the surrounding components.
Larry
C3 & 4 are the MAIN FILTER CAPS. They are your HI VOLTAGE FILTERS from AC to DC after the rectifier.
- C5, C6 Phono section coupling caps
- C7, C8, Coupling caps from output of Phono section
-C13, C14 Coupling caps between sections of the tone section
- C25, C26, Output coupling caps
-C27, C28 Output coupling caps
- C33 snubber cap in the rectifier/voltage doubler
These are all either POWER SUPPLY CAPS, OR SIGNAL PATH COUPLING CAPS. These are the most important of any caps in the X-100-B. And probably the majority. One of the signal path caps goes BLEUWY and you lose a channel. Or if one of the Main Filter caps or one of it's sections goes out, you either lose the amp totally or most of it. They can also short and kill it. Plus the new caps have a higher heat tolerance than those in the early 60's. The one's in there have been cooked for going on 55-57 years so they could be pretty well ready for replacement. Electrolytics (filter can's) should be replaced every 20-30 years or when you notice them heating up more than the surrounding components.
Larry