Ok, until we sort this out, do not turn it back on.
I'm writing a quick reply with images.
Here is a picture of one of a V4 that I recapped.
C18 and C20 are not in parallel as you have them wired, They are in series. i.e. the negative end of C20 goes into the positive of C18.
Additionally there should be 2 100k resistors, one going from positive terminal of C20 to positive terminal of C18 then one going from negative terminal of C20 to negative terminal of C18.
If you have 580V going across C18 and C20 right now, you're exceeding the voltage rating of those capacitors by a significant margin. They may be damaged.
![[Image: recap.png]](http://www.vintageampeg.com/wp-content/uploads/2016/05/recap.png)
I don't understand what you mean regarding the bias supply. When you say you " built a second bias circuit and altered R35, R36 into a 75k + 50k trim pot. " what does that mean? can you draw the schematic? If you use two bias supplies then you don't need a balance pot, so what is that circuit supposed to be doing?
I'm writing a quick reply with images.
Here is a picture of one of a V4 that I recapped.
C18 and C20 are not in parallel as you have them wired, They are in series. i.e. the negative end of C20 goes into the positive of C18.
Additionally there should be 2 100k resistors, one going from positive terminal of C20 to positive terminal of C18 then one going from negative terminal of C20 to negative terminal of C18.
If you have 580V going across C18 and C20 right now, you're exceeding the voltage rating of those capacitors by a significant margin. They may be damaged.
I don't understand what you mean regarding the bias supply. When you say you " built a second bias circuit and altered R35, R36 into a 75k + 50k trim pot. " what does that mean? can you draw the schematic? If you use two bias supplies then you don't need a balance pot, so what is that circuit supposed to be doing?