Search found 971 matches

by Guy77
Tue Apr 01, 2025 1:15 am
Forum: PCB Design
Topic: 183 Preamp PCB layout for 1U chassis
Replies: 6
Views: 590

Re: 183 Preamp PCB layout for 1U chassis

Hi. I was looking at your board in PCB-Way Gerber viewer. I wanted to ask if these ( yellow arrow) are screw in terminals for the wires connections to the pre amp tubes for example. Also what are the dimensions of your preamp board? ** Hey, Guy - those are connectors with a 3.5mm pitch from the Mol...
by Guy77
Sat Mar 29, 2025 3:18 pm
Forum: PCB Design
Topic: 183 Preamp PCB layout for 1U chassis
Replies: 6
Views: 590

Re: 183 Preamp PCB layout for 1U chassis

Hi.
I was looking at your board in PCB-Way Gerber viewer.
I wanted to ask if these ( yellow arrow) are screw in terminals for the wires connections to the pre amp tubes for example.
Also what are the dimensions of your preamp board?

Thanks!
Cheers
G
Capture.JPG
by Guy77
Tue Mar 11, 2025 2:29 pm
Forum: Dumble Discussion
Topic: Artifacts on F#
Replies: 14
Views: 1469

Re: Artifacts on F#

Make sure every single wire run that requires a shieled cable has one. Try using a chop stick to move the signal wires in the preamp section and see if the noise goes away.
Be very careful doing this since the voltages here are dangerous.

Cheers
G
by Guy77
Mon Mar 10, 2025 5:48 pm
Forum: Dumble Discussion
Topic: Dumble Bandmaster Gator UltraPhonix Build
Replies: 52
Views: 14309

Re: Dumble Bandmaster Gator UltraPhonix Build

That's great news! Congrats Ryan.
Soon you will have to start cranking out a bunch of these amps!

Cheers
Guy
by Guy77
Wed Mar 05, 2025 7:10 pm
Forum: Marshall Discussion
Topic: Calculating required transformer voltage specs for 100w marshall
Replies: 18
Views: 3074

Re: Calculating required transformer voltage specs for 100w marshall

Just as a reference point on the real world final B+ for the Hammond 290HX 100 watt power trans. I have used these on builds for 4x6L6 tube amps with 3 preamp tubes ( much like an older Marshall amp except the 6L6). I consistently get 463v on the plates of the 4 x 6L6GC JJ tubes with 120v wall volta...
by Guy77
Tue Mar 04, 2025 7:25 pm
Forum: Technical Discussion
Topic: Error 429 Too many requests
Replies: 14
Views: 1245

Re: Error 429 Too many requests

Strange that we were able to have over 1000 users on line in the past (2020) and now it can't handle a fraction of that.

Cheers
G
by Guy77
Sun Mar 02, 2025 5:35 pm
Forum: FAQs
Topic: Stereo power amp
Replies: 1
Views: 4080

Re: Stereo power amp

Hi. Any tips on where to find layout of a stereo power amp? Say 20-30watt? Hi, EL34World has a nice Stereo power amp project. I haven't tried it but the guys there build great projects! https://el34world.com/projects/StereoPowerAmp1.htm There are also several other Stereo power amp projects on ther...
by Guy77
Tue Feb 25, 2025 11:21 pm
Forum: PCB Design
Topic: Channel switcher PCB
Replies: 15
Views: 20902

Re: Channel switcher PCB

I made a new channel switcher using Arduino Nano Every. It's been years since I did any kind of programming but I tried to make the Arduino sketches as simple as possible. The same PCB can be used in an amp to control relays and in a pedal to remotely control the channel switching. Schematic channe...
by Guy77
Sun Feb 09, 2025 3:38 pm
Forum: Dumble Discussion
Topic: Another Dumbleator
Replies: 7
Views: 2641

Re: Another Dumbleator

Nice work with the Dremel. I used the same chassis to make mine yrs ago except I used the Hammond black powder coated steel chassis and it was a lot harder to cut the steel. Nice thing about the powder coating is that nowadays with the cheaper fiber lasers you can laser off the powder to label the c...
by Guy77
Tue Jan 28, 2025 10:41 pm
Forum: Dumble Discussion
Topic: Brownface bandmaster ultraponic build
Replies: 9
Views: 2447

Re: Brownface bandmaster ultraponic build

Love those brown face fender faceplates!

Cheers
G
by Guy77
Wed Jan 22, 2025 9:12 pm
Forum: Technical Discussion
Topic: Guitar Amp Wiring Notes
Replies: 17
Views: 1715

Re: Guitar Amp Wiring Notes

Over time, I wind up writing replies to questions on wiring inside amps. My time is sliced up into little sections, so I have started saving these bits and when I can, sanitizing and interlacing them into some kind of overall whole. Over a period of some months, that finally got linked up into a ba...
by Guy77
Wed Jan 22, 2025 2:32 pm
Forum: Dumble Discussion
Topic: AN Wonderland/JM 100w layout
Replies: 312
Views: 150065

Re: AN Wonderland/JM 100w layout

Love the suede finish. Congrats! I am also a fan of the Celestion G12-65 speakers for this amp. The EV12L and the Celestion V Type 70 also sound amazing with this amp. I see Dorrisant mentioned the Eminance 12N. I like that this speaker is lighter. I will have to give that one a try. It would be a g...
by Guy77
Sun Jan 19, 2025 6:21 am
Forum: Dumble Discussion
Topic: Steel String Singer #005 build
Replies: 55
Views: 9440

Re: Steel String Singer #005 build

As for my thread about the #002 build: I initially started this whole journey with the idea of building some sort of Steel String Singer. About half a year ago I stumbled upon this forum, found Erwin's thread and being the quick thinker that I am bought one of his chassis. Just a few weeks later I ...
by Guy77
Wed Jan 15, 2025 9:10 pm
Forum: Garage Talk
Topic: Chassis Maker Recommendations
Replies: 34
Views: 10037

Re: Chassis Maker Recommendations

An FYI: I just reached out to Seaside about a chassis and was informed that Terry had passed away in December. Very sad to hear - it seems like this was a vendor that offered great quality chassis work. Sorry to hear that. He built a small custom chassis for me last year & I was just thinking this ...
by Guy77
Sun Jan 05, 2025 5:16 am
Forum: Dumble Discussion
Topic: Cabinet questions
Replies: 6
Views: 1678

Re: Cabinet questions

Ok, so forgive this very primitive markup. :? :) Is this roughly correct? Screen set back apprx 8mm or 3/8” from front of cabinet. Chassis set back apprx 1 1/8” from front of cabinet, and about 1/4 from the cutout above it. I just want to be in the ballpark so it doesn’t seem completely off, LOL. H...