Questions about modding a Tweedle Dee Deluxe

[Slim66]

Folks,

Let me state up front that I am a total newbie, so please forgive my ignorance. That being said, after I built a nice 5F1, I built a pair of 5E3's-a standard circuit, and the Tweedle Dee Deluxe hosted right here on the AmpGarage.
It sounds real good with a GZ34 and 2 5881 Tung-Sols (I used the proper transformers). I want to try the Rob Robinette 3 way negative feedback switch. I am confused because of the split cathode bypass caps/resistors. I wired the switch with the cap/resistor the goes to pin 3, but did not hear any differences at all. What am I doing wrong?
Also, I would like to separate the two volume controls (no interactivity), but following a scheme on Rob Robinette's page led to a big mess.

Any help would be greatly appreciated.

Thanks,

Slim

[sluckey]

I want to try the Rob Robinette 3 way negative feedback switch. I am confused because of the split cathode bypass caps/resistors. I wired the switch with the cap/resistor the goes to pin 3, but did not hear any differences at all. What am I doing wrong?

Sounds like you are trying to connect the switch to V1 pin 3. You need to connect the switch to V2 pin 3.

Also, I would like to separate the two volume controls (no interactivity), but following a scheme on Rob Robinette's page led to a big mess.

Give us a link to that scheme.

[Slim66]

Thanks, Steve.

Here’s a link: https://robrobinette.com/5e3_Modificati ... nteraction

Thanks,

Slim

[sluckey]

Are you trying to do the "Simple Volume Interaction Mod" or the "Eliminate Volume Interaction With a Dual Gang Tone Pot"?

I suggest doing the NFB switch mod first. When you are satisfied it's working properly, then tackle the other mod.

[Slim66]

Will do, Sir! Thanks again.

Slim

[Slim66]

Steve,

I can’t believe I made such a dumb mistake! I was rushing, and preoccupied with an upcoming small surgical procedure. It’s working fine now.

Doh!


Slim