Search found 264 matches

by mdroberts1243
Thu Apr 26, 2007 2:37 am
Forum: Dumble Files
Topic: D'Lite Schematic
Replies: 9
Views: 13166

Relay Power Supply corrected.

I corrected the power supply page of the schematic posting... the relay power voltage doubler runs off of the 5V secondary, NOT the center tapped heater secondary.
by mdroberts1243
Wed Apr 25, 2007 1:38 am
Forum: Dumble Discussion
Topic: Cathode Biased tone?
Replies: 6
Views: 665

Re: Cathode Biased tone?

Cathode bias warms up the sound of normal Fender type amps but is not needed on clone builds. I had a switchable one one the first clone project that I later removed and I've never looked back. The tone is in the preamp - the output section should be as clean as possible. If you must try one here's...
by mdroberts1243
Tue Apr 24, 2007 9:59 pm
Forum: Dumble Discussion
Topic: Cathode Biased tone?
Replies: 6
Views: 665

Re: Cathode Biased tone?

try it and see! I will be glad to do that, eventually. So far I've been building single-ended ultralinear amps and tube distortion pedals... I haven't yet got a push-pull platform to try it on. I'm gearing up for a PP build, and I think I've got a taste for the D'Lite design... but opinions and exp...
by mdroberts1243
Tue Apr 24, 2007 7:55 pm
Forum: Dumble Discussion
Topic: Cathode Biased tone?
Replies: 6
Views: 665

Cathode Biased tone?

Maybe a dumb question, but I see sooo many differing opinions, I'd like the Dumble forum to weigh in on this... How much 'tone' is attributed to the fixed bias output stages I see on the Dumble schematics? What about cathode biased as an alternative? What should I expect to be different in the sound...
by mdroberts1243
Sun Apr 22, 2007 11:51 am
Forum: Dumble Files
Topic: D'Lite Schematic
Replies: 9
Views: 13166

Error correction

I updated the schematics above to correct an error Drew found on the other forum... Power Supply resistor between C & D was 2.2K should've have been 22K.
by mdroberts1243
Sat Apr 21, 2007 2:33 pm
Forum: Dumble Files
Topic: D'Lite Schematic
Replies: 9
Views: 13166

PI plate resistors corrected

This has the panel & footswitch wiring and the power supply page. UPDATED: Minor tweeks and an error corrected... the 2.2K between power C & D changed to 22K. UPDATED: Corrected relay power supply. UPDATED: Corrected PI plate resistor values (swapped 82k and 100k around). UPDATED: Swapped blue & bro...
by mdroberts1243
Sat Apr 21, 2007 1:49 am
Forum: Dumble Files
Topic: D'Lite Schematic
Replies: 9
Views: 13166

D'Lite Schematic

I have seen a few requests for a schematic of the D'Lite... thought I'd give ExpressSCH a try and here is a (draft) schematic of the D'Lite with Relays from Normster's web page (the one I'd like to build someday). This is just the circuit proper, I haven't done the power supply and shown the relay c...
by mdroberts1243
Fri Apr 20, 2007 1:10 pm
Forum: Dumble Discussion
Topic: Umble pedal?
Replies: 53
Views: 7628

Re: Umble pedal?

For the convenience of those that don't want to search through 30 pages of 'confirm my order for $395 sight unseen' here is the the direct link to the clips... http://www.soundclick.com/bands/pagemus ... dID=662595
by mdroberts1243
Tue Apr 17, 2007 7:28 pm
Forum: Dumble Files
Topic: ODS-101-HRM LITE?
Replies: 4
Views: 2406

Eliminating an ODS-HRM tone stack.

This is an interesting question/problem to me. It is not clear to me whether or not you can get away with just the post distortion stack... Wouldn't the pre-amp tone stack alter the character of the signal enough that it would effect where and how the distortion kicks in? This is something I've been...