Search found 1004 matches

by Luthierwnc
Thu Jun 15, 2023 1:50 am
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Replacing the 270k/100k voltage divider with a 500k trimmer for fine tuning.

Nutha question; I'm not married to that dry/wet pot value. It's 25k now. bcook thought I might try a 250k in there when I was chasing the gremlin. Any other ideas on that or a different circuit? Thanks, sh
by Luthierwnc
Thu Jun 15, 2023 12:42 am
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Thanks Dan. I'm going to drop a 500k trimmer in there and season to taste. sh
by Luthierwnc
Wed Jun 14, 2023 1:32 am
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

I took the head downstairs tonight to replace the return (MV) pot with a push/pull version that will switch the Dumbleator in and out. It's on the back of the amp -- so not the best placement -- but if it works I'll consider more extensive surgery. I did have to order the pot. As it stands right the...
by Luthierwnc
Tue Jun 13, 2023 12:12 pm
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Thanks dbharris. I forget the voltage divider but think it was 100k to ground after a 270k. I'm coming to the conclusion that I like the D-Lator better as an effect than as an active loop. The FET I could live without so I may convert that switch to a p/p pot and steal the relay to make the loop swi...
by Luthierwnc
Mon Jun 12, 2023 1:29 pm
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Thanks Reeltarded -- been a while, By unity I meant the same sine strength at the end of the loop as going in. That's about noon on both pots. Since the loop recovery output pot is also the overall master, fiddling with that to get the loop levels right detracts from the overall performance. The TC ...
by Luthierwnc
Mon Jun 12, 2023 2:44 am
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

That was it. No ground on the cathode follower makes effects zesty! I made a couple other tweaks when I was in there. Great sounding amp and now the D'Lator is more than a final gain stage. I do have another issue: That TC Flashback II is a pretty good little delay but it is overwhelmed by the signa...
by Luthierwnc
Sun Jun 11, 2023 3:50 pm
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Preliminary report: Think I found the culprit. I tried to push the ground wire on the send pot out of the way for a better look and it moved too easily. Solid core wire broken inside the sleeve. All those ground were connected to the pre-amp bus bar. I'll put it through its paces later today. sh
by Luthierwnc
Sat Jun 10, 2023 3:11 pm
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Stephen1966; Don't remember. It's been a while since I've been in there. I'll get it downstairs and see what it looks like. You can see the pots and knobs on the left lower corner. My guess is the black wire coming from the second jack to the right is grounded on that barrier strip. FWIW, with nothi...
by Luthierwnc
Sat Jun 10, 2023 11:46 am
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Thanks Rootz, I'll have to take a look. Not sure when. I've attached the schematic (homebrew). The overall master is really the D-Lator recovery pot. And the clean master is bypassed in OD mode. A difference in the loop is the series/parallel pot. Honestly, I can't tell a difference. That might not ...
by Luthierwnc
Thu Jun 08, 2023 12:58 pm
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Re: Delay self-oscillation problem with Dumbleator

Will do when the household is up for joyous music!

Nearing 11 am: Removing the buffer made some difference but devices at 8:00 on the level knob start feeding back. I threw a NU-X Atlantic on there since I know it pads-down to +4 dB. Same thing. I'll just put it back on the board. Thanks, sh
by Luthierwnc
Thu Jun 08, 2023 1:41 am
Forum: Dumble Discussion
Topic: Delay self-oscillation problem with Dumbleator
Replies: 18
Views: 1878

Delay self-oscillation problem with Dumbleator

Hi All. I'm doing a bit of soldering after a long layoff. One project has been building a daughter-board for reverb and delay that sits on the amp to use in the onboard D'Lator so I can try a four-cable method without twenty extra feet of cable. The reverb works great. I also got an Empress Buffer P...
by Luthierwnc
Thu Jun 01, 2023 12:40 am
Forum: Dumble Discussion
Topic: Amp-top Midi switcher question
Replies: 1
Views: 224

Amp-top Midi switcher question

Hi All, I’m debating whether to sell my Dumble clone or play it. It has a built-in Dumbleator (tube activated loop). It would make sense to put the delay and reverb in that loop on top of the amp – which is where I could use a little advice. In a four cable setup we’re looking at another 20 feet (6 ...
by Luthierwnc
Mon Apr 25, 2022 11:24 pm
Forum: Dumble Discussion
Topic: OD/gain pedal for ODS clone?
Replies: 23
Views: 4417

Re: OD/gain pedal for ODS clone?

Thanks Stelligan, I had a chance to turn the amp up a little. The AC booster sounds good but it really isn't a tone I can use, for that amp anyway. Not sure I need a flanger or a chorus, much less both. An EQ seems like a good idea, though. I do like the Zendrive clone and I'm thinking I'll try the ...
by Luthierwnc
Sun Apr 24, 2022 3:22 pm
Forum: Dumble Discussion
Topic: OD/gain pedal for ODS clone?
Replies: 23
Views: 4417

Re: OD/gain pedal for ODS clone?

I made a new board to fit things -- and still got it wrong since I didn't allow for top-mounted jacks on one stomp-box. Sounds good. Once I'm sure of the pedal chain I'll tighten-up the cables and 9v connections. We've got: TU-2 > Xotic RC Booster > Xotic AC Comp > Aion Azimuth > volume pedal, > Ego...
by Luthierwnc
Mon Apr 18, 2022 12:08 am
Forum: Dumble Discussion
Topic: OD/gain pedal for ODS clone?
Replies: 23
Views: 4417

Re: OD/gain pedal for ODS clone?

The Bogner is interesting. Not many of them out there. Acquisitions like this give me OCD (not the pedal). There are hundreds of gizmos that would do a great job. You can't get them all. The trick is to not think you can make a better choice after the marginal value of research flat-lines. They only...