Need help w/ Fisher 500C 7591 socket wiring

[USOUNDS]

Hello.
I have a Fisher 500C that was wired for Sovtek 7591XYZ back in the 90s.
This was the first 7591 replacement tube sold and from what I have read has a 6L6 pinout.
The sockets were rewired and a 250 ohm/10watt resistor was added to pin 5.
I want to convert it back to using 7591 tubes but need help wiring the sockets as they were originally.
Here are some photos.
Thanks for any help with this.

 

[gadget73]

I think the only thing you really need to do is remove the 250 ohm resistors and the grey cap, and tie pin 5 to ground on each tube. I'd tie it to ground through a 10 ohm resistor so you can monitor current on the output tubes.

I sort of wish they still sold those tubes. They're perfect 7355 subs. Not much as a 7591 sub though.

I would probably advise adding the screen stability resistors while you're in here, replacing those two General capacitors, and the can caps as well if they're original.

 

[notdigital]

Here is a stock 800-c output area. If I have a 500-c pic I'll put it up too.

 

[larryderouin]

500c / 800c output area is for all intents identical.

 

[thornev]

usounds - Did you get what you need? I have a 500-C and the schematic for it is available online.

 

[Catmanboo]

If need be, I can send a pic of an unmodified 500c for reference.