Search found 12 matches
- Mon Apr 22, 2024 1:32 am
- Forum: Technical Discussion
- Topic: Friedman Naked Amp schematic?
- Replies: 10
- Views: 2149
Re: Friedman Naked Amp schematic?
Xenrelic, Thanks for posting that. Billy Howerdel has killer tone. So, no feedback resistor? Just the capacitive divider 1n->10n/4k7? Do you know if this is on the 4R tap, as shown? Thanks. No feedback resistor, just the 10k/4.7nF to GND with the 1nF straight to the speaker jack tip. It's not conne...
- Sat Apr 20, 2024 7:06 am
- Forum: Technical Discussion
- Topic: Friedman Naked Amp schematic?
- Replies: 10
- Views: 2149
Re: Friedman Naked Amp schematic?
The Naked MK1 amp is different from the long form schematic posted here. I'm assuming that is a schematic of a variant of the OD channel that someone made up. These are the specs you need to change for MK1. Power filtering: C1 & C22 16uF 500v Preamp: Add .01uF from ground of input to chassis Delete ...
- Tue Feb 06, 2024 5:56 am
- Forum: Dumble Files
- Topic: Vibroverb RI Dumble Hybrid Mod
- Replies: 1
- Views: 3819
Re: Vibroverb RI Dumble Hybrid Mod
Posted some updates to the schematic in the original post attachment if anyone wants the latest schematic of the Vibroverb Dumble Hybrid.
- Sat Nov 14, 2020 6:45 am
- Forum: Fender Discussion
- Topic: Fender 'The Twin' Red Knob Version Mods and Repairs
- Replies: 14
- Views: 18450
Re: Fender 'The Twin' Red Knob Version Mods and Repairs
Here's a different version of the mod that was applied to a similar Fender Red Knob Dual Showman Reverb Head. It's a bit less involved and for people that don't want to mod their clean channel, because they're pretty happy with it. I'd say this mod is more for people who like the stock clean channel...
- Fri Jul 03, 2020 12:30 am
- Forum: Dumble Discussion
- Topic: Popping again.....Cap across channel switch?
- Replies: 45
- Views: 8054
Re: Popping again.....Cap across channel switch?
You will always have pop when switching cathode resistors, one for another with a mechanical switch. You should try the J175 P-Channel switch as they work great for silent cathode resistor and capacitor switching, when you have the larger value cathode resistor always in circuit and switching in ano...
- Mon Apr 01, 2019 7:01 am
- Forum: Fender Discussion
- Topic: Fender 'The Twin' Red Knob Version Mods and Repairs
- Replies: 14
- Views: 18450
Re: Fender 'The Twin' Red Knob Version Mods and Repairs
Yep, that was a typo. C305 for the series screen supply filter was supposed to be C306. It was difficult to read from the schematic I was using. I fixed the O.P. above to reflect that change.
- Tue Dec 19, 2017 8:31 pm
- Forum: Dumble Files
- Topic: Dumbleator Layout
- Replies: 67
- Views: 78932
Re: Dumbleator Layout
Here's the Triad R-2C power transformer spec sheet with dimensions for the Dumblelator.
- Mon Mar 20, 2017 8:22 am
- Forum: Fender Discussion
- Topic: Fender 'The Twin' Red Knob Version Mods and Repairs
- Replies: 14
- Views: 18450
Fender 'The Twin' Red Knob Version Mods and Repairs
Thought I'd share some excellent sounding mods for the Fender 'The Twin' Red Knob Combo. The amp stands up to high dollar boutique amps after the following mods. - Power Supply Section: Bias supply filter C303 = 100uF 100v F&T C304 = 100uF 100v F&T C305 = 100uF 100v F&T C202 = 100uf 100v F&T Series ...
- Fri Dec 20, 2013 5:44 am
- Forum: Technical Discussion
- Topic: led lit faceplate...
- Replies: 18
- Views: 5118
- Mon Sep 30, 2013 4:16 am
- Forum: Dumble Files
- Topic: Vibroverb RI Dumble Hybrid Mod
- Replies: 1
- Views: 3819
Vibroverb RI Dumble Hybrid Mod
Here's a '63 Vibroverb Reissue with some Dumble Hybrid modifications. For those that love the AB763 style circuit with the clean channel capability of the ODS. This amp sounds amazing with the mods! The normal channel is set up with a little extra drive for nice pushed singing driven tones. Feel fre...
- Wed Jun 06, 2012 8:44 pm
- Forum: Technical Discussion
- Topic: 1M Reverse Audio Pot
- Replies: 22
- Views: 10935
- Thu Mar 15, 2012 1:29 am
- Forum: Technical Discussion
- Topic: Source for Magicparts Transformer???
- Replies: 13
- Views: 5138
Re: Source for Magicparts Transformer???
I have a used Dumble TF-170 output transformer that was removed to be replaced with a TF-135 years ago. If anyone wants it, hit me up.