My math says over 1000% in ESR.
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- Tue May 14, 2024 11:46 am
- Forum: Technical Discussion
- Topic: Illinois brand capacitors still bad?
- Replies: 15
- Views: 732
- Tue May 14, 2024 11:26 am
- Forum: Technical Discussion
- Topic: Does a 'bright cap' really boost highs?
- Replies: 21
- Views: 4966
Re: Does a 'bright cap' really boost highs?
Correct. The cap is a bypass around the upper part of the resistive divider.
- Tue May 14, 2024 11:16 am
- Forum: Technical Discussion
- Topic: Does a 'bright cap' really boost highs?
- Replies: 21
- Views: 4966
Re: Does a 'bright cap' really boost highs?
I finally got a load of caps to try in my 5F1 based amp. Quick question: Do I put the bright cap between lugs 1 and 2 of the Volume pot, or between lugs 2 and 3? I've seen it mentioned both ways. Or doesn't it matter? Might depend on how you number the lugs. If lug 3 is the input, lug 2 is the wipe...
- Tue May 14, 2024 11:13 am
- Forum: Dumble Discussion
- Topic: ODS 102 with 2x KT88s and built-in Dumbleator
- Replies: 30
- Views: 754
Re: ODS 102 with 2x KT88s and built-in Dumbleator
So, I'm just looking at the FET circuit and the Relay power supply. If I use the Triad F-216X 12VAC supply, it looks like I use a FWB rectifier. I need a TO220 Regulator? Any recommendations? It just needs to regulate that 12VDC? LM7812 regulator as shown on the D schematics will be fine. Looking a...
- Mon May 13, 2024 6:25 pm
- Forum: Dumble Discussion
- Topic: ODS 102 with 2x KT88s and built-in Dumbleator
- Replies: 30
- Views: 754
Re: ODS 102 with 2x KT88s and built-in Dumbleator
Am I seeing right that I may be able to take my heater supply and use it to feed the power for the relay switching? Or is that generally more trouble than using one of these 12V transformers? I think it's simpler to use a separate transformer for the relays. You can use 12VAC and a bridge, or 6VAC ...
- Mon May 13, 2024 4:47 pm
- Forum: Dumble Discussion
- Topic: ODS 102 with 2x KT88s and built-in Dumbleator
- Replies: 30
- Views: 754
Re: ODS 102 with 2x KT88s and built-in Dumbleator
... and trying to figure out what transformer works well for the relay power... Raoul Duke posted a data sheet for this small Triad for relay power using a FWB: https://www.mouser.com/ProductDetail/Triad-Magnetics/F-216X?qs=b1anAsPanWyvCrSmsu4ZQw%3D%3D This Hammond is also a possibility for FWB: ht...
- Mon May 13, 2024 4:16 pm
- Forum: Dumble Discussion
- Topic: ODS 102 with 2x KT88s and built-in Dumbleator
- Replies: 30
- Views: 754
Re: ODS 102 with 2x KT88s and built-in Dumbleator
There's info on these in the ODS boards .pdf here https://ampgarage.com/forum/viewtopic.php?f=5&t=29630
- Sun May 12, 2024 8:46 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 56
- Views: 2560
Re: 2nd Gen Build
I did a bit of that and noticed it cleaned up well. If I can live with it that way and not have to alter the circuit that would be ideal. If not, the dual masters is a good plan. I never run two cabs anyways. The only bit of the circuit you would need to modify is between the OD2 coupling cap and O...
- Sun May 12, 2024 2:01 pm
- Forum: Technical Discussion
- Topic: Hypothetical Amp Discussion
- Replies: 9
- Views: 359
Re: Hypothetical Amp Discussion
I already have something like this set up on an HX Stomp on my board at the moment, and it does sound great, but we started laughing at the idea of having both loops being tube-driven... And joked that we might as well throw in a tube-driven reverb tank in there too. That's a lot of tubes! 4 preamp...
- Sat May 11, 2024 10:05 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 56
- Views: 2560
Re: 2nd Gen Build
Yes try changing the bias point. The gain should rise sharply at some point and then level off.
- Sat May 11, 2024 3:01 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 56
- Views: 2560
Re: 2nd Gen Build
What are the voltages at the top and bottom of the drain resistor?
- Sat May 11, 2024 1:08 pm
- Forum: FAQs
- Topic: Tube amp grounding article/info/links
- Replies: 26
- Views: 80532
Re: Tube amp grounding article/info/links
Thanks Dai.
Moderators, maybe this thread should be moved to the new FAQ area?
Moderators, maybe this thread should be moved to the new FAQ area?
- Sat May 11, 2024 1:00 pm
- Forum: Dumble Discussion
- Topic: Robben Ford & His Dumble Overdrive Special
- Replies: 15
- Views: 500
Re: Robben Ford & His Dumble Overdrive Special
To be fair, the Robben part of the video was a fraction of the overall time. He's talked about his Dumble amps and his introduction to and friendship with HAD many times before, but there always seems to be something new. I agree hearing different players and different guitars was really valuable, a...
- Sat May 11, 2024 12:25 pm
- Forum: Dumble Discussion
- Topic: 2nd Gen Build
- Replies: 56
- Views: 2560
Re: 2nd Gen Build
If that is just heater glow you are seeing through the hole in the tube base I wouldn't worry about it. Are you seeing that through the gap between the index pin and the socket? Might the odor be transformer varnish?
- Fri May 10, 2024 10:37 pm
- Forum: Dumble Discussion
- Topic: The Much Anticipated (?) Bluesmaster Build Thread
- Replies: 42
- Views: 1459
Re: The Much Anticipated (?) Bluesmaster Build Thread
I was trying to come up with a rationale, but in the end at 120V the current limit will be the same, Bulb Wattage/120