Tweed to BF tone circuit output loss

[MikeT]

I changed a Fender tweed style Vol-Tone tone stack to a BF Fender style Vol-Treble-Bass tone stack and the power output is half of what it should be. The...

[MikeT]

Terry,

I can't check the voltages with the tubes in because the board starts smoking...not good! I have a feeling it is a problem underneath...

[MikeT]

I've got those manuals, but thanks anyway. I have a couple pics but I can't get this bb to upload them. I click on "Insert Image", navigate to...

[MikeT]

I just finished a JTM 45 kit from Mojo and there are issues. The b+ is near 500VDC at all b+ points with just the GZ34 in. Granted, the pre and power tubes...

[MikeT]

I brought it to a buddy of mine and it's in his bench. He's real good and very equipped. He seems to think it's a ground loop but I'll ask him to check...

[MikeT]

I built a 2204 from a combination of a kit and parts I had. I installed DC filiments. The amp is good but hum from v1 is nuts. I used shielded wire for...

[MikeT]

I don't like the C12Q Alnico either - C10Q does sound better to me. However, a nice 12" ceramic, like a Celestion of some sort does the trick. For...

[MikeT]

I'm Rebuilding a Champ with a 10" and a Princeton AA964 but circuit but cathode bias and thought to do the Paul C mod too. I was looking around and...

[MikeT]

I reworked the grounding and it is much quieter. I had all the pot backs connected and then once to the chassis. I removed it from the chassis and moved...

[MikeT]

I forgot to mention that rectification is by means of (4) 1n0007 diodes. OK, I'll rework the grounding ...I'll tear out the additional (5) 22@500's and start...

[MikeT]

It is set up as per your mod....each leg to tubes only and 100 ohm reference to ground on each leg at the pilot light. Still hums...................

[MikeT]

I rebuilt a champ to a (2) 6V6, long tailed driver, cathode bias, bf fender tone stack. The hum is not obnoxious, but it makes it almost unuseable. From...

[MikeT]

Thanks guys..........

Mike

[MikeT]

What is the theory behind this mod? Anyone got a schematic?

[MikeT]

This is the Stokes, Paul C and Rick E mods. Rick E has the effect of Stokes on steroids......

http://www.blueguitar.org/new/articles/blue...

[MikeT]

An OT with a lower primary impedence of 3000 or 4000 ohms like for 6L6s would probably work...

[MikeT]

Tubes..............

[MikeT]

Ahh... I get it now..Thanks!

[MikeT]

Thanks for the quick response...how are the (2) 100k plate resisters now parallel if they are replaced wirth 1 common 47k for both plates?

[MikeT]

Doesn't removing the 100k plate resister for plate 2 effect the plate voltage going to plate 1 because the voltage divider is gone?

[MikeT]

I stumbled on this and so far have done 2 builds with this spec with real good results...check it out.

http://online.physics.uiuc.edu/co...