Search found 3791 matches

by Bob-I
Wed Mar 27, 2024 4:03 pm
Forum: Dumble Discussion
Topic: AA electronics PCB build
Replies: 0
Views: 68

AA electronics PCB build

I decided to rebuild the Bluesmaster I build several years ago. I’ve never been totally happy with it and when I saw these PCBs from AA I thought I’d give it a go. I recently did the same thing with my Super Reverb build and I’m happy with the results. These PCBs are well designed and good quality, ...
by Bob-I
Tue Mar 26, 2024 11:52 pm
Forum: Dumble Discussion
Topic: Signal resistor type
Replies: 6
Views: 266

Re: Signal resistor type

You guys are funny, I should come here more often.

My challenge was finding a vendor who stocked KOA of the values I needed, seems simple, but in the end I ordered Vishay's from AES.
by Bob-I
Sat Mar 23, 2024 3:40 am
Forum: Dumble Discussion
Topic: Signal resistor type
Replies: 6
Views: 266

Re: Signal resistor type

Thx Dan. I actually found that thread, and I appreciate all your hard work. It left my head spinning. I've used KOA before and like them, so maybe I'll grab some for the plates and see how it sounds. The good news is, these boards are built so solid you can desolder and resolder with almost no issues.
by Bob-I
Fri Mar 22, 2024 8:24 pm
Forum: Dumble Discussion
Topic: Signal resistor type
Replies: 6
Views: 266

Signal resistor type

Hi folks, it’s been awhile since I put together a Dumble style amp, I’m at it again. 10 years ago I used Vishay RN65 for plates and Xicon carbon film for everything else, cathodes, signal chain, etc. The RN65s weren’t all that when I last used them, and I’m looking for a consensus on what folks are ...
by Bob-I
Wed Mar 13, 2024 11:17 pm
Forum: Fender Discussion
Topic: Super reverb build, vibrato doesn’t work
Replies: 3
Views: 100

Re: Super reverb build, vibrato doesn’t work

Well scratch this…I shouldn’t just read the component value and measure it, I should check the schematic to make sure I have the right value first, had a .01 where a .02 was called for. That said, the trem worked but was very fast, unusable fast. I upped the ,02uF to .047 uF then.1 uF to get it unde...
by Bob-I
Wed Mar 13, 2024 6:38 pm
Forum: Fender Discussion
Topic: Super reverb build, vibrato doesn’t work
Replies: 3
Views: 100

Re: Super reverb build, vibrato doesn’t work

sluckey wrote: Wed Mar 13, 2024 6:28 pm That circuit requires a footswitch to enable the tremolo. Connect a footswitch or put a shorting plug in the VIB footswitch jack. Any joy?
Yes, I shorted the Jack with a jumper and the light comes on.
by Bob-I
Wed Mar 13, 2024 6:22 pm
Forum: Fender Discussion
Topic: Super reverb build, vibrato doesn’t work
Replies: 3
Views: 100

Super reverb build, vibrato doesn’t work

Hi folks. I re-built a Super Reverb using a PCB from AA Electronics out of the UK. Originally this was a 20 year old (maybe) Weber kit and some off the components were questionable quality. I decided that instead of using the original board and replace all the components, I’d try this PCB. FWIW the ...
by Bob-I
Wed Sep 06, 2023 1:47 am
Forum: Fender Discussion
Topic: Deluxe Reverb, one channel, no tremolo
Replies: 40
Views: 7583

Re: Deluxe Reverb, one channel, no tremolo

Ok, I’ll agree with that. I felt they were needed, but maybe not everyone does.

Either way, this is a great approach to a classic design. I don’t have use for the normal channel or the tremolo, so it suits my needs perfectly.
by Bob-I
Wed Sep 06, 2023 12:37 am
Forum: Fender Discussion
Topic: Deluxe Reverb, one channel, no tremolo
Replies: 40
Views: 7583

Re: Deluxe Reverb, one channel, no tremolo

Well, without the bass pot connection the bass control was ineffective. Yes, “need” is a strong word. As for the reverb plate. My build was humming like crazy until I moved it, now it’s very quiet, so I’d say that’s important.
by Bob-I
Tue Sep 05, 2023 11:15 pm
Forum: Fender Discussion
Topic: Deluxe Reverb, one channel, no tremolo
Replies: 40
Views: 7583

Re: Deluxe Reverb, one channel, no tremolo

This is a great thread on a great amp. I had a Princeton type chassis with an amp in it I didn’t like, so I decided to use this layout and schematic, I’m glad I did. I have the same xformers as in the schem. I fabricated the board, and the bias supply board was already in there so it was an easy bui...
by Bob-I
Tue Feb 22, 2022 11:28 pm
Forum: Dumble Discussion
Topic: What happens now?
Replies: 30
Views: 3750

Re: What happens now?

IMHO, the main thing that passed away when Alexander passed, was his ears, and his ability to connect sound with physics.

RIP Dr. D. I hope the folks in heaven appreciate your talent.
by Bob-I
Wed Feb 09, 2022 8:41 pm
Forum: Technical Discussion
Topic: Modded DR Too Much Filtering?
Replies: 44
Views: 2891

Re: Modded DR Too Much Filtering?

Looking at the voltages, something’s off. It’s hard to tell, because this is a modified circuit so I’m not sure the function of each tube. Do you have the schematic? If not, a description of the amp and tube function, I.E. V1 preamp, V2, reverb, etc. I’d suspect that one of the 12AX7s is incorrectly...
by Bob-I
Tue Feb 08, 2022 3:53 am
Forum: Dumble Discussion
Topic: I’ve been away, advise requested, rehearsal report added.
Replies: 40
Views: 4308

Re: I’ve been away, advise requested, rehearsal report added.

CHIP wrote: Mon Feb 07, 2022 11:44 pm As I recall, although I may be wrong , but I think #183 was biased on the cold side.
Scott Lerner suggested bias at about 35ma, but I’m not sure what amp he was talking about. I run my 4x6L6 blues master at 52ma. Unfortunately I can’t ever crank that amp up, which is why I built the little one.
by Bob-I
Mon Feb 07, 2022 1:03 am
Forum: Dumble Discussion
Topic: I’ve been away, advise requested, rehearsal report added.
Replies: 40
Views: 4308

Re: I’ve been away, advise requested, rehearsal report added.

Sounds WAY better, both in clean and OD. I don't know what power tubes you have but I find with new production you have to bias them up a bit to fill out the mids. All of the real Dumbles I have had my hands on were biased pretty warm by him. CW I originally built this amp for 6V6s, deluxe iron, bu...
by Bob-I
Sat Feb 05, 2022 10:03 pm
Forum: Dumble Discussion
Topic: I’ve been away, advise requested, rehearsal report added.
Replies: 40
Views: 4308

Re: I’ve been away, advise requested, rehearsal report added.

xtian wrote: Sat Feb 05, 2022 7:38 pm Bob! Nice!!! Great singer, too. Play that demo for me blind, I might not notice it’s a tribute band!
Well…the singer is gone. Great voice and stage presence but he couldn’t remember the songs.

Glad you enjoyed it, we work hard.