Tweedle Dee is quite interesting but doesnt deliver any much new tones than a stock 5e3 but it does sound a little bit meatier (improved bass response) and has faster attack response and sounds like its a bit on steroids
Gee, Nik must be getting fat and lazy. In the old days, it would have taken two weeks for something to go from ampgarage thread to Ceriatone production model, not two years.
Well, six years later and I think a made a mistake with regards to one of the component values in the Tweedle Dee. After talking to Jelle a while ago and staring at my own photos I now believe that the grid leak resistor on the PI is a 10 meg rather than a 1 meg.
CW
Charlie Wilson wrote: ↑Mon Oct 05, 2020 1:38 am
Well, six years later and I think a made a mistake with regards to one of the component values in the Tweedle Dee. After talking to Jelle a while ago and staring at my own photos I now believe that the grid leak resistor on the PI is a 10 meg rather than a 1 meg.
CW
what effect will that have Charlie from an electrical and tone point of view?
I could of course try it but interested in the technical/theory side as well.
There's probably going to be a run on 10 Meg resistors... Someone will have to try it to see what tonal effect it has, but don't think there will be much impact. I'm guessing that the large value is to help isolate the feedback signal from the bias and cathode resistors.
martin manning wrote: ↑Mon Oct 05, 2020 2:21 pm
There's probably going to be a run on 10 Meg resistors... Someone will have to try it to see what tonal effect it has, but don't think there will be much impact. I'm guessing that the large value is to help isolate the feedback signal from the bias and cathode resistors.
I'm surprised that Dumble didn't knock off more bottom end with this amp. There's way to much when using it with a different cabinet/speaker. I've got 0.004uf in place of the 0.022uf caps and I think that makes for a well balanced amp tonally now. I don't suppose the 10M grid leak in conjunction with the cap would have any impact on reducing the low end?
norburybrook wrote: ↑Mon Oct 05, 2020 3:53 pmI don't suppose the 10M grid leak in conjunction with the cap would have any impact on reducing the low end?
martin manning wrote: ↑Mon Oct 05, 2020 2:21 pm
There's probably going to be a run on 10 Meg resistors... Someone will have to try it to see what tonal effect it has, but don't think there will be much impact. I'm guessing that the large value is to help isolate the feedback signal from the bias and cathode resistors.
Yeah that's what Jelle's theory was to decouple the grid from the cathode resistors. I imagine the signal is going hit the grid a bit harder. I don't have a Tweedle Dee build right now so I was hoping someone would try the 10 meg and report back. I am gearing up for a Tweedle Dee build and was looking at the photos when I realized I had made a mistake and I am pretty certain that is a 10 meg.
CW
martin manning wrote: ↑Mon Oct 05, 2020 2:21 pm
There's probably going to be a run on 10 Meg resistors... Someone will have to try it to see what tonal effect it has, but don't think there will be much impact. I'm guessing that the large value is to help isolate the feedback signal from the bias and cathode resistors.
Yeah that's what Jelle's theory was to decouple the grid from the cathode resistors. I imagine the signal is going hit the grid a bit harder. I don't have a Tweedle Dee build right now so I was hoping someone would try the 10 meg and report back. I am gearing up for a Tweedle Dee build and was looking at the photos when I realized I had made a mistake and I am pretty certain that is a 10 meg.
CW
Charlie,
Just done the mod. It makes a difference the breakup/OD is smoother now, more gainy OD I'd say. Not a huge difference but noticeable and preferable, a good tone with my filtertron tele I tested it with.
I tested with the amp in regular tweed mode and on the bright input, everything at 12 O 'clock so it should be as the standard Tweedle dee (my amp is modded with variable FNB and re-voiced standard channel).
The test is to put your guitar though a looper and switch between the two settings. That will provide the greatest evidence of the difference in timbre. It has been my findings that most people have a poor memory of timbre.
Personally, I find if I’ve owned the piece of equipment for quite a while then I’ll know it. Otherwise, I won’t be so sure. I video everything these days. It has really surprised me. Changes that I thought were barely noticeable were quite apparent when playing back a recording.