grid stopper question

[87MJ]

Awesome site, I've learned a ton here just reading...

I'm converting a sort of Deluxe Reverb clone that I built into a sort of D-based clone. I guess I'm following #124, but not exactly. In the clean stage, the D's have a grid stopper, and sometimes a parallel cap, coming off of the volume into V1b, while the DR does not have one. What effect does the stopper (or lack of stopper) have on the clean and then OD sound? I notice some different values there, so it must do something...

I'm probably going to swap some in there to hear first hand, but wanted to maybe get some direction first. Thanks.

[Structo]

Awesome site, I've learned a ton here just reading...

I'm converting a sort of Deluxe Reverb clone that I built into a sort of D-based clone. I guess I'm following #124, but not exactly. In the clean stage, the D's have a grid stopper, and sometimes a parallel cap, coming off of the volume into V1b, while the DR does not have one. What effect does the stopper (or lack of stopper) have on the clean and then OD sound? I notice some different values there, so it must do something...

I'm probably going to swap some in there to hear first hand, but wanted to maybe get some direction first. Thanks.

Grid stoppers can be used to tame high end as well as provide a stable input.
The higher the value the resistor, the more top end it takes off.
The cap on gridstopper on V1b is a bypass cap used to brighten the tone somewhat.

With the Dumble amps it's all these things together that help define their tone.

[M Fowler]

Here is a link to a Princeton reverb to ODS conversion with schematic and photos that my help with your Deluxe.

https://tubeamparchive.com/viewtopic.ph ... ght=#16953


Mark

[87MJ]

With the Dumble amps it's all these things together that help define their tone.

I figured as much...

Thanks for the input guys. Time to start tweaking!

[renshen1957]

Awesome site, I've learned a ton here just reading...

I'm converting a sort of Deluxe Reverb clone that I built into a sort of D-based clone. I guess I'm following #124, but not exactly. In the clean stage, the D's have a grid stopper, and sometimes a parallel cap, coming off of the volume into V1b, while the DR does not have one. What effect does the stopper (or lack of stopper) have on the clean and then OD sound? I notice some different values there, so it must do something...

I'm probably going to swap some in there to hear first hand, but wanted to maybe get some direction first. Thanks.

Grid stoppers can be used to tame high end as well as provide a stable input.
The higher the value the resistor, the more top end it takes off.
The cap on gridstopper on V1b is a bypass cap used to brighten the tone somewhat.

With the Dumble amps it's all these things together that help define their tone.

Grid Stoppers can prevent grid rectification (which causes a flatulent sound) as well as being part frequency shaping attenuators (with caps or without caps).