Search found 400 matches
- Sat May 11, 2024 5:14 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
New FET biased up easy. I set it for just under 3 for the Vdd/Vd ratio. It sounds good, but the volume is lower than the normal channel even with the FET trimmer wide open. I may bring the ratio closer to 2.5 and see if that helps. What are the voltages at the top and bottom of the drain resistor? ...
- Sat May 11, 2024 2:50 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
New FET biased up easy. I set it for just under 3 for the Vdd/Vd ratio. It sounds good, but the volume is lower than the normal channel even with the FET trimmer wide open. I may bring the ratio closer to 2.5 and see if that helps. I played the amp for a bit just to get a feel. It sounds very nice. ...
- Sat May 11, 2024 1:08 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
Hi Martin, I think you are correct and it is just varnish. This PT is old and looks a little funky. After I swapped in the JJs, there was still an odor. It seemed like a lot less strong, but at this point my mind may be playing tricks on me. Also, I could not get this J201 to bias in range. It wante...
- Sat May 11, 2024 11:54 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
Thanks guys. I'll leave the bias resistor alone for now. The other tube biased lower maybe around 55-57%. I pulled the tubes, sprayed compressed air, cleaned the sockets with deoxit and a toothbrush, looked for any leads that may be close and causing arcing, cleaned the female side of the socket, an...
- Sat May 11, 2024 11:40 am
- Forum: Dumble Discussion
- Topic: Robben Ford & His Dumble Overdrive Special
- Replies: 10
- Views: 265
Re: Robben Ford & His Dumble Overdrive Special
Very cool, thanks for sharing!
- Fri May 10, 2024 10:32 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
Preamp glass for now. V1 and V2 are RCA grey plate 12AX7A. V3 is RCA black plate 12AT7. PXL_20240510_164414227.jpg Power tubes are fender branded Sylvania short bottle 6L6GC with double top getters. PXL_20240510_164448700.jpg When I swapped the tubes I noted 2 things. First, with the bias set most n...
- Fri May 10, 2024 10:22 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
All good with the smoke test and forming the caps. Put my startup tubes in and biased the amp. All functions are working. Tone stack is not super effective, but I think that is just the design. Reserving tone impressions as I only played briefly and at low volume. But does strike me as more raw sou...
- Fri May 10, 2024 10:54 am
- Forum: Dumble Discussion
- Topic: A SSS Build
- Replies: 10
- Views: 244
Re: A SSS Build
Looks great!
- Fri May 10, 2024 10:51 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
Thank you! I have not used the Jupiter caps before. As the Spragues get harder to find in stock and always more expensive, these seemed like they might be a good alternative.
Orange and blue for my Florida Gators!
-Dan
Orange and blue for my Florida Gators!
-Dan
- Fri May 10, 2024 2:37 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
All good with the smoke test and forming the caps. Put my startup tubes in and biased the amp. All functions are working. Tone stack is not super effective, but I think that is just the design. Reserving tone impressions as I only played briefly and at low volume. But does strike me as more raw soun...
- Fri May 10, 2024 1:47 am
- Forum: Dumble Discussion
- Topic: My take on a 2nd Gen ODS
- Replies: 89
- Views: 2687
Re: My take on a 2nd Gen ODS
Hi Matt,
Some of those solder joints on the jacks look a bit dry, but may just be the photograph. Have you tried inserting a patch cable in the fx loop jacks?
-Dan
Some of those solder joints on the jacks look a bit dry, but may just be the photograph. Have you tried inserting a patch cable in the fx loop jacks?
-Dan
- Thu May 09, 2024 10:02 pm
- Forum: Dumble Discussion
- Topic: A SSS Build
- Replies: 10
- Views: 244
Re: A SSS Build
Hi Glenn, I'm excited to watch this build! I wanted to also drop you a note to thank you, because seeing your post reminded me I forgot to order those doohickeys for my two Erwin chassis.
-Dan
-Dan
- Thu May 09, 2024 8:34 pm
- Forum: Dumble Discussion
- Topic: My take on a 2nd Gen ODS
- Replies: 89
- Views: 2687
Re: My take on a 2nd Gen ODS
... 2. Is there any benefit to switching from the 2nd Gen Deep Switch to the to the version from the 4th/5th eras as this design does? From trying it when this amp would work, I was not that impressed with the 2nd Gen's function. ... You will find most 4th Gen amps that still have a classic tone st...
- Thu May 09, 2024 11:13 am
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 48
- Views: 2222
Re: 2nd Gen Build
All wired up! Just need to add fuses and run the startup procedure tonight.
- Wed May 08, 2024 12:36 pm
- Forum: Dumble Discussion
- Topic: My take on a 2nd Gen ODS
- Replies: 89
- Views: 2687
Re: My take on a 2nd Gen ODS
Sorry I misunderstood! Good luck tracking it down.