If so, stephenmartin17 at comcast dot net.
Thank you
Search found 16 matches
- Fri Jul 26, 2013 4:43 am
- Forum: Trainwreck Discussion
- Topic: Komet 60 Schematic...Accurate ?
- Replies: 209
- Views: 105912
- Sun Mar 20, 2011 9:10 pm
- Forum: Dumble Discussion
- Topic: Dumble SE
- Replies: 24
- Views: 4571
"fake PI"
.I thought it might've been a "fake" PI I think that the third stage is a filter. Here is my analysis. Using superposition: 1) short out the cathode and then the transfer function of the output network using the plate as the input is 470k/(Ztube+100k+(1/s*0.01uF)+470k). Since tube output impedance ...
- Sun Mar 20, 2011 7:43 pm
- Forum: Trainwreck Discussion
- Topic: Train wreck models
- Replies: 5
- Views: 5516
The Songwriter
Does anyone have a schematic of the Songwriter?
- Fri Mar 18, 2011 2:10 am
- Forum: Dumble Files
- Topic: Suhr Minimix II - complete schematic
- Replies: 26
- Views: 15582
If it sounds good, great. It can be improved.
Do you own a minimix II or have you tried one? If so, what hiss and what noise, are you refering to, the MMII is completely noiseless. Dont try to reinvent the wheel The relays are there in order for you to switch off parallel operation if you use eg a compressor Or eq in the loop. I agree that the...
- Thu Mar 17, 2011 12:49 am
- Forum: Dumble Files
- Topic: Suhr Minimix II - complete schematic
- Replies: 26
- Views: 15582
Poor Design
I cannot believe they put the relay in the summing node of the op amp. Any noise that couples in here will see the total open loop gain of the op amp. The input resistor should go between the relay and the op amp. The 49.8k's are probably the recommended load for the xformers. They could be wired as...
- Mon Mar 08, 2010 1:42 am
- Forum: Dumble Discussion
- Topic: Finished Dumblelator
- Replies: 73
- Views: 11760
Re: Finished Dumblelator
UltraHooked,
What a professional job. My stuff always looks like a science fair project.
What a professional job. My stuff always looks like a science fair project.
- Mon Mar 08, 2010 12:25 am
- Forum: Trainwreck Files
- Topic: Wanted: Two Rock Ruby schematic
- Replies: 16
- Views: 18747
Re: Wanted: Two Rock Ruby schematic
Thanks for the gut shot. I looks like the schematic is correct. My guess is it is a copy of the Dumblator return ckt. The Dumblator and Dumblator II schemes are the same as the Two Rock's implementation. Are the Dumblator schemes wrong (are they all based on a single reverse engineering job)? Did HA...
- Sun Mar 07, 2010 11:31 pm
- Forum: Dumble Files
- Topic: Dumbleator II
- Replies: 19
- Views: 18470
Re: Dumbleator II
Hmmm. I have the same concerns with this schematic that I had with the Two Rock Ruby scheme. Did Two Rock use a bad Dumble scheme? Did HAD make a mistake in his circuit (Leo Fender's mistakes are crucial to the development of the electric guitar tone--so this is not necessarily a bad thing)? My conc...
- Sun Mar 07, 2010 10:58 pm
- Forum: Dumble Discussion
- Topic: Will the real presence circuit please stand up!
- Replies: 10
- Views: 2974
Re: Will the real presence circuit please stand up!
Also the upper left and the one directly to the right of it are identical from an electrical point of view. The one on the right is the best practice. Connecting the wiper to the other tap prevents an open circuit if the wiper fails. The upper right and the lower left only differ in the type of cap ...
- Sun Mar 07, 2010 9:55 pm
- Forum: Trainwreck Files
- Topic: Wanted: Two Rock Ruby schematic
- Replies: 16
- Views: 18747
Re: Wanted: Two Rock Ruby schematic
There is a resistor missing between the return jack and the network feeding the return recovery stage. Otherwise the amount of voltage feedback from the 22M resistor would depend on the output impedance of the FX pedal plugged into the return jack. Some FX have a passive output where the volume cont...
- Sun Dec 23, 2007 5:04 am
- Forum: Dumble Discussion
- Topic: Dumble Acronyms
- Replies: 14
- Views: 2071
D'Lite?
So the D'Lite refers to a Dumble inspired 18Watt amp and not to anything that HAD designed?
- Thu Dec 20, 2007 3:53 am
- Forum: Garage Talk
- Topic: Schematic Heaven down
- Replies: 16
- Views: 5304
It's down again
SH has been down again for about week.
Maybe I am paranoid, but perhaps a post '70's amp company threatened him with legal action.
Does anyone know what is going on?
Maybe I am paranoid, but perhaps a post '70's amp company threatened him with legal action.
Does anyone know what is going on?
- Sat Dec 08, 2007 4:04 am
- Forum: Dumble Discussion
- Topic: just a few props!
- Replies: 6
- Views: 2261
Don't Completely Agree
I believe that Mat Mathias of Matamp was the first to: 1) Use voltage feedback around a single triode stage (like the Dumble stage with the 22M resistors) 2) Use a pot on the long tail pair to get the right ratio on the plate resistors. What is unique about Dumble: 1) The "snubber" caps 2) The Skyli...
- Sat Dec 08, 2007 3:49 am
- Forum: Dumble Discussion
- Topic: just a few props!
- Replies: 6
- Views: 2261
Don't Completely Agree
I believe that Mat Mathias of Matamp was the first to: 1) Use voltage feedback around a single triode stage (like the Dumble stage with the 22M resistors) 2) Use a pot on the long tail pair to get the right ratio on the plate resistors. What is unique about Dumble: 1) The "snubber" caps 2) The Skyli...
- Fri Dec 07, 2007 3:26 am
- Forum: Dumble Discussion
- Topic: Dumble Steel Singer schematics?
- Replies: 14
- Views: 6313
SS Scheme
I have this.