Search found 374 matches
- Wed May 08, 2024 8:52 am
- Forum: Garage Talk
- Topic: The rack is Back?! Maybe not for everyone, but at least for me !
- Replies: 9
- Views: 424
Re: The rack is Back?! Maybe not for everyone, but at least for me !
Found this gutshot that seems to show a tube on the left 12A_7 (PI? or preamp?) SYN2-Midi-fix_start_sm.jpeg And a thread that talks about the modules and found this schematic : SYN module Structure.jpg So they get 320V B+ DC from the power module (midi or amp I suppose). I like the old fashion eyel...
- Tue Apr 16, 2024 5:54 am
- Forum: Dumble Discussion
- Topic: My take on Eric Johnson's Steel String Singer #005
- Replies: 220
- Views: 115552
Re: My take on Eric Johnson's Steel String Singer #005
Good catch! Main objective was to lower the gain a bit. Why? The power amp has much more gain than the LTP+CF combination. The windows started to rattle with the master on 1. The amp did lose its wilder side though. Local feedback made it even cleaner, which was not what I was looking for. It did b...
- Mon Apr 15, 2024 6:14 am
- Forum: Dumble Discussion
- Topic: My take on Eric Johnson's Steel String Singer #005
- Replies: 220
- Views: 115552
Re: My take on Eric Johnson's Steel String Singer #005
And the schematic minus all relais. I think this amp would benefit from a deep switch instead of a mid boost, though that is subjective. No full layout. It's 90% SSS005 though. Hi Rootz, Nice amp and thanks for the schematic. I noticed you implemented a LNFB on V1b in this amp which AFAIK was absen...
- Sun Mar 24, 2024 5:39 pm
- Forum: Dumble Discussion
- Topic: New Project
- Replies: 26
- Views: 1299
Re: New Project
Nice!
What is this? Intrigued.
Best,
Electron
What is this? Intrigued.
Best,
Electron
- Sun Mar 17, 2024 7:04 am
- Forum: Technical Discussion
- Topic: Tweedle Dee PI - LNFB and trimmer
- Replies: 38
- Views: 2298
Re: Tweedle Dee LNFB
Hi Charlie, Now I am a bit confused. Is it a 10M or 1M? Best, Electron Well, six years later and I think a made a mistake with regards to one of the component values in the Tweedle Dee. :oops: After talking to Jelle a while ago and staring at my own photos I now believe that the grid leak resistor o...
- Sat Mar 02, 2024 9:26 pm
- Forum: Dumble Discussion
- Topic: Todd Sharp amp (121) some musings/ideas
- Replies: 3
- Views: 381
Re: Todd Sharp amp (121) some musings/ideas
Many thanks for your reply Charlie!
Indeed Ampeg amps might have been a huge inspiration for Dumble. I found this Ampeg V9 schematic and this is quite interesting.
https://el34world.com/charts/Schematics ... peg_v9.pdf
Thank you,
Electron
Indeed Ampeg amps might have been a huge inspiration for Dumble. I found this Ampeg V9 schematic and this is quite interesting.
https://el34world.com/charts/Schematics ... peg_v9.pdf
Thank you,
Electron
- Sat Mar 02, 2024 2:55 pm
- Forum: Dumble Discussion
- Topic: Todd Sharp amp (121) some musings/ideas
- Replies: 3
- Views: 381
Todd Sharp amp (121) some musings/ideas
Dear Ampgaragists, As you all know, Dumble ODS #121 is a rare specimen. Read up on the history of #121 and you will see that it was built for Todd Sharp and that it is covered in the Dumble book. Little to no information is available, but from the little information I derived a draft for a schematic...
- Tue Feb 20, 2024 6:54 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 56
- Views: 2469
Re: 2nd Gen Build
What components you planning on? Mostly piher resistors, a combination of el menco and Mallory brown drops and Sprague di-film caps. Some old mepco rn60e for v1 and v2 plates and old Dale 50k for v3 plates with a 5k trimmer. Cathode caps a mix of old bc Philips and new Sprague TE, cathode resistors...
- Tue Feb 20, 2024 6:52 am
- Forum: Technical Discussion
- Topic: LND150 MOSFET as first gain stage
- Replies: 21
- Views: 740
Re: LND150 MOSFET as first gain stage
And is the only possible source of this voltage whatever the user puts into the input? Yes - including scuffling across a carpet and then touching the end of the guitar cable to plug it in. Several kV is pretty common for things like that. Then there's the static electrical gradient, about 120V/met...
- Thu Feb 15, 2024 7:45 pm
- Forum: Dumble Discussion
- Topic: Yet another Dumbleator
- Replies: 9
- Views: 593
Re: Yet another Dumbleator
Really neat work! I love your rig. Once you go rack, you can never go back! First pic is with the 200w per side Class D stereo power amp, but I couldn't resist an all tube 20/20 rig in the end! The Palmer Macht does have some slam though, and I'm keeping it. Wow, that looks nice rogb! Did you tweak...
- Thu Feb 15, 2024 7:08 pm
- Forum: Dumble Discussion
- Topic: Yet another Dumbleator
- Replies: 9
- Views: 593
Re: Yet another Dumbleator
Thank you for your kind words Ian!ijedouglas wrote: ↑Thu Feb 15, 2024 7:02 pm Amazing work. I just love the look of those rackmount units. Great workmanship!
Electron
- Thu Feb 15, 2024 6:15 pm
- Forum: Dumble Discussion
- Topic: Yet another Dumbleator
- Replies: 9
- Views: 593
Re: Yet another Dumbleator
Schematic
- Thu Feb 15, 2024 6:14 pm
- Forum: Dumble Discussion
- Topic: Yet another Dumbleator
- Replies: 9
- Views: 593
Yet another Dumbleator
Fellow Ampgaragists, Forum member dbharris graciously provided me with a set of his very fine Dumbleator PCB sets. See his thread about his built: https://ampgarage.com/forum/viewtopic.php?f=4&t=36202&p=451296&hilit=Dumbleator#p451296 Apparently he still has some sets so I would encourage everyone t...
- Wed Feb 14, 2024 5:00 pm
- Forum: Dumble Discussion
- Topic: Revisit High-Plate Classic with a 5-piece chassis
- Replies: 41
- Views: 1875
Re: Revisit High-Plate Classic with a 5-piece chassis
Hi Ian, fantastic build again. Do you think grounding points in this chassis have something to do with the sound of the amp? Current flows can be a strange thing. Maybe I do a PM on this. Erwin Thanks Erwin, I'm convinced of it. If you look at the attention HAD paid in his amps to the grounds as we...
- Sun Feb 11, 2024 9:45 am
- Forum: Dumble Discussion
- Topic: Colgan’s SSS without reverb
- Replies: 11
- Views: 887
Re: Colgan’s SSS without reverb
Hi Eges,
I built a 002 clone without the reverb section but with an internal Dumbleator FX loop back in 2014. It sounds great.
Here is the schematic I recently upadated with the bipolar bias circuit as per Martin Manning.
Hope this helps.
Best,
Electron
I built a 002 clone without the reverb section but with an internal Dumbleator FX loop back in 2014. It sounds great.
Here is the schematic I recently upadated with the bipolar bias circuit as per Martin Manning.
Hope this helps.
Best,
Electron