Search found 13127 matches
- Tue Apr 23, 2024 7:52 am
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 64
- Views: 1943
Re: Bluesmaster HRM question:
Either one would be fine. I don’t think the power stage voltage is all that critical, and you can adjust the first dropping resistor as needed. Maybe make the call based on source, cost, and shipping charges incurred?
- Tue Apr 23, 2024 7:35 am
- Forum: Technical Discussion
- Topic: Taming amp gain in single channel deluxe reverb build
- Replies: 51
- Views: 1017
Re: Taming amp gain in single channel deluxe reverb build
Would i still be changing the 820R to a 1.2k or could I just change the 47R to a 33R? Either way will work for you since there is no presence control. If there were, changing the PI tail resistor would change the frequency response of the feedback, which would require a change to the presence cap v...
- Mon Apr 22, 2024 11:04 pm
- Forum: Dumble Files
- Topic: SSS #002 REDRAW DRAFT
- Replies: 68
- Views: 12899
Re: SSS #002 REDRAW DRAFT
Yes, yours matches the hand-drawn schematic.
- Mon Apr 22, 2024 8:32 pm
- Forum: Technical Discussion
- Topic: Taming amp gain in single channel deluxe reverb build
- Replies: 51
- Views: 1017
Re: Taming amp gain in single channel deluxe reverb build
This comes up all the time. You can keep the same feedback resistor on the same tap, and put the speaker on whichever one it matches, or, move the feedback resistor to the tap the speaker is on, and adjust it's value by (New Spkr Tap/Old Spkr Tap)^0.5 Given the secondary hookup for the 1620, you wil...
- Mon Apr 22, 2024 8:29 pm
- Forum: Dumble Files
- Topic: SSS #002 REDRAW DRAFT
- Replies: 68
- Views: 12899
Re: SSS #002 REDRAW DRAFT
No problem, and it basically reduces the output 1 dB if the feedback goes direct to the grid. Other than that, I don't know.
- Mon Apr 22, 2024 7:23 pm
- Forum: Dumble Files
- Topic: SSS #002 REDRAW DRAFT
- Replies: 68
- Views: 12899
- Mon Apr 22, 2024 6:12 pm
- Forum: Dumble Files
- Topic: SSS #002 REDRAW DRAFT
- Replies: 68
- Views: 12899
- Mon Apr 22, 2024 5:48 pm
- Forum: Dumble Files
- Topic: SSS #002 REDRAW DRAFT
- Replies: 68
- Views: 12899
Re: SSS #002 REDRAW DRAFT
Hi Ryan, it's this. As drawn vs. the red. Your layout shows the red.
- Mon Apr 22, 2024 4:25 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 64
- Views: 1943
Re: Bluesmaster HRM question:
By the time you get to the preamp nodes it doesn't mater. If you keep the same dropping string, B+3 to 4, and B+4 to 5, the PI will fall into place.Raoul Duke wrote: ↑Mon Apr 22, 2024 12:32 pm I wonder how the layout’s dropping string values would interact with a Bassman spec PT? I realize the PI is different and that plays a part.
- Mon Apr 22, 2024 3:07 pm
- Forum: Dumble Files
- Topic: SSS #002 REDRAW DRAFT
- Replies: 68
- Views: 12899
Re: SSS #002 REDRAW DRAFT
The swap between the 10k & 2.2M was either a tip I received from someone (likely) or based on observation of other amps. The stability of the reverb was not great with 2m2 in series with the reverb send pot. I also realized that feedback made much more sense with 2m2 and the 10k in series with the ...
- Mon Apr 22, 2024 11:59 am
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 64
- Views: 1943
Re: Bluesmaster HRM question:
Re the voltages, most important is to get the V1 plates into line. As I said, I don't have any direct BM experience, and there aren't any voltages listed on the layout. The TF-130 PT was a Fender Twin replacement, so you should shoot for 440-450V B+1. I think I’m hung up on all the different color r...
- Mon Apr 22, 2024 1:42 am
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 64
- Views: 1943
Re: Bluesmaster HRM question:
Cheap, too!
- Mon Apr 22, 2024 1:36 am
- Forum: Technical Discussion
- Topic: Taming amp gain in single channel deluxe reverb build
- Replies: 51
- Views: 1017
Re: Taming amp gain in single channel deluxe reverb build
Gotta say, this is a really nice little amp! Love the look, too.sluckey wrote: ↑Thu Apr 18, 2024 4:43 pm I just installed a 100K master volume pot in my single channel DR. Lets you control how much signal is sent to the PI. Works fine for me. Take a look...
https://sluckeyamps.com/tdr/tdr.pdf
- Sun Apr 21, 2024 9:42 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 64
- Views: 1943
Re: Bluesmaster HRM question:
I have no idea why Fender wanted such high voltage on the reissue Bassman. The original 5F6-A voltage was shown at 450V. That OT look like the solution I think it is? Should be fine. I think you'd be good with the Black Bassman PT, or maybe Hammond 290DX. ...just trying to figure out the V1 resistor...
- Sun Apr 21, 2024 7:17 pm
- Forum: Dumble Discussion
- Topic: Bluesmaster HRM question:
- Replies: 64
- Views: 1943
Re: Bluesmaster HRM question:
The Bassman RI would produce a pretty high B+1 voltage, 490V on the '59 Bassman reissue schematic. You could use it and drop the PI and preamp voltages down as you have done before.