The actual problem as it turns out, after pulling main and tube pcb, there was some crud residue at the solder joints at each end of the ribbon cable causing a short between grid and plate. Cleaned crud. Amp works.
Thank you for responding
Search found 218 matches
- Wed Oct 28, 2020 4:42 pm
- Forum: Technical Discussion
- Topic: Extremely low plate voltage on v1 Blues Junior green board
- Replies: 2
- Views: 238
- Wed Oct 28, 2020 11:57 am
- Forum: Technical Discussion
- Topic: Extremely low plate voltage on v1 Blues Junior green board
- Replies: 2
- Views: 238
Extremely low plate voltage on v1 Blues Junior green board
Pins 1 and 6 both measure about 4vdc. Over 200vdc dumping across plate load resistors. 1-Changed plate load resistors,no change 2-Checked filament voltage between 4-9, 5-9. Normal 3-Checked continuity from tube socket to corresponding parts on pcb. All good. 4-Cathode resistors check out and are gro...
- Tue Dec 22, 2015 1:18 am
- Forum: Dumble Discussion
- Topic: Dot missing from schematic??
- Replies: 3
- Views: 1226
Dot missing from schematic??
Am I correct in thinking a dot is missing from this schematic to indicate a connection?
- Mon Dec 21, 2015 7:51 pm
- Forum: Technical Discussion
- Topic: Ampeg V4B Series Filter Cap Question
- Replies: 13
- Views: 2223
Re: Ampeg V4B Series Filter Cap Question
These are multisection can caps in the originals, so getting bleeders in the right place is non-trivial. If you use modern Mallory twist-lock caps, they no longer come with heavy black insulator sleeves, so the "top" cap case will sit at half the B+. You can't let it ground. If you touch it, it wil...
- Thu Oct 08, 2015 9:03 pm
- Forum: Dumble Discussion
- Topic: Want to Dumble mod a 1964 Fender Princeton with tremolo
- Replies: 6
- Views: 1910
Re: Want to Dumble mod a 1964 Fender Princeton with tremolo
what a terrible idea to take something that is a thing of vintage perfection and hack it. Really bad idea.
- Mon Jun 15, 2015 1:33 am
- Forum: Technical Discussion
- Topic: Friedman "Naked" Amp - Ideas?
- Replies: 21
- Views: 9236
Re: Friedman "Naked" Amp - Ideas?
not accuratemhartman wrote:Here's a schem that I found on the web a while back. I'm not sure if it is accurate or not, but it might be helpful to you.
- Sun May 17, 2015 11:57 am
- Forum: Dumble Discussion
- Topic: Hook Up Wire Voltage Rating (300v?)
- Replies: 23
- Views: 7244
- Tue May 12, 2015 5:41 pm
- Forum: Dumble Discussion
- Topic: Overdrive #124 in 16x8x3in Chassis
- Replies: 11
- Views: 4369
- Thu Apr 30, 2015 11:06 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546
Re: Posting shots of Quinn SDQ1, SDQ2 - ok?
I think it is sdo if there is such a thing or sdq
- Thu Apr 30, 2015 8:58 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546
- Thu Apr 30, 2015 8:57 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546
- Thu Apr 30, 2015 8:57 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546
- Thu Apr 30, 2015 8:56 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546
- Thu Apr 30, 2015 8:56 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546
- Thu Apr 30, 2015 8:55 pm
- Forum: Dumble Discussion
- Topic: Posting shots of Quinn SDQ1, SDQ2 - ok?
- Replies: 90
- Views: 13546