Regarding bias circuits in Fender amp designs

I finally finished wiring up my amp around 3AM Tuesday morning. I spent the rest of the day(after sleeping) building my bulb limiter and fixing my Variac to get the amp ready to rock. I have been trying to debug ever since, I have already gone through 5 times and still can't find the wrong I need to right. Its not as easy as just tracing the circuits. I have to desolder and move out of the way all the wires to the pots just to get the board up enough to see the preamp tubes. I have fixed a problem with my bias board, moved a couple of wires I had in the wrong place, and fixed found a solder joint I has left unsoldered in my Filter stage. Everything is where it should be now but I still get the bulb lighting when I turn the amp on. The only thing I can think of is maybe the MV wont work with the biasing I am using???? I have found that on the fixed bias amps Fender doesn't send the two .1 capacitors in the section to pins 1&6 like on the cathode biased amps. Instead they send the first .1 cap to pin 8(the cathode) then the second .1 goes to #6 then the .02 cap beside that one goes to #1. Any ideas on whats happening here, This is the Fender 5E4A Super Amp

I am looking at the 5D4 and 5E4 schematics and I guess I don't understand your question completely. The values are different in the coupling caps Cathode = .05 fixed = .1

What is the amp now doing ot not doing?

Did you use the bias model I sent you? What is the neg v at the wiper of the bias pot?

Is your MV like the model we had floating around here? If so that should work fine.

The fixed bias models don't hav the coupling caps in the bias circuit going to pins 1&6, they go to pins 6&8 and pin 1 goes to the .02 cap just to the right of the bias circuit. It seems that most of the fixed bias Fenders are doingthe same thing. Yes, I am using the MV model you sent me as well as the bias supply. After last night I am just flabergasted, I have literally poured over all the circuit and albiet found mistakes here and there that I have now corrected. I haven't taken any voltage readings as I am under the impression that I need to have all the shorts fixed first.

I keep looking at the schematic and am still confused. But I see you mentioned pin #1. Octal power tubes (6V6-6L6) are actually 6 pin tubes. On the socket itself pins 1 & 6 are unused. Look at the bottom of your 6V6's and see how many pins are present, usually it's 6.

If you look at Leo Fenders layout sheets he often used unused pins on the sockets as a tie point like a tag strip. He did just that on this when he used pin 6 as a splice point for the 1500 resistor comming from pin 5. Pin 6 has no function inside the tube.

This is one of the reasons why I never look at anyone elses layout sheet. It only reflects how the original builder put things together.

I am talking about pins 1&6 of the phase inverter tube. I only noticed it when I was looking at the diffrent Master volumes in the book I have where it shows the two legs of the bias circuit going to pins 1&6 of the phase inverter, but on the fixed bias amps thst is not happening.

In fact looking at the schematics and layouts of both the fixed bias and cathode biased amps The circuits are vastly different. This leads me to believe that this style master volume might not work with fixed bias amps. I am going to rewire it without the MV and see how it goes.