Search found 2551 matches

by dorrisant
Sun Feb 25, 2024 10:35 pm
Forum: Dumble Discussion
Topic: CF driver Va - Vk voltages in SSS consensus?
Replies: 76
Views: 4057

Re: CF driver Va - Vk voltages in SSS consensus?

Just thought I'd post this here... the way I have been setting this up. Of course this is just a section of an example.

No preamp board space taken by the components, easy enough to add to just about any layout.

Feel free to critique. Hope it helps.
by dorrisant
Sun Feb 25, 2024 9:44 pm
Forum: Dumble Files
Topic: Ultraphonix adventure
Replies: 200
Views: 212899

Re: Ultraphonix adventure

Nice sounds... I like the tweed head. Do you have any gunshots of this one?
by dorrisant
Sat Feb 24, 2024 4:13 pm
Forum: Trainwreck Discussion
Topic: 2xEL84 Liverpuddle
Replies: 14
Views: 5042

Re: 2xEL84 Liverpuddle

Very nice looking build!
by dorrisant
Wed Feb 14, 2024 2:09 pm
Forum: Dumble Files
Topic: Ultraphonix adventure
Replies: 200
Views: 212899

Re: Ultraphonix adventure

Sounds great Fred! Awesome job 👍
by dorrisant
Tue Feb 13, 2024 7:06 am
Forum: Technical Discussion
Topic: New F&T 100uf 350v caps: Tip Of The Week
Replies: 54
Views: 1806

Re: New F&T 100uf 350v caps: Tip Of The Week

Has anyone tried the MOD brand of caps?

I have been using them in everything for a while now. It seems that they are better (less shrill) than F&Ts.

Just wondering how they compare to what you've tested. I'm curious about how they stack up for the price.
by dorrisant
Wed Feb 07, 2024 5:50 am
Forum: Dumble Discussion
Topic: Replace Radio Schack 3v transformer with this????
Replies: 9
Views: 329

Re: Replace Radio Schack 3v transformer with this????

You will not need the doubler circuit, or you need a different TX.
by dorrisant
Wed Feb 07, 2024 5:07 am
Forum: Dumble Discussion
Topic: Replace Radio Schack 3v transformer with this????
Replies: 9
Views: 329

Re: Replace Radio Schack 3v transformer with this????

Do you have a schematic of what it is that you are replacing? Hard to tell without more clues.

If it is the standard Dumble relay supply, then yes - with modification to the circuit.

I've included a cropped image of #124 to show the connection. 6.3 v TX doubled with a 12 v regulator.
by dorrisant
Tue Feb 06, 2024 1:25 pm
Forum: Garage Talk
Topic: This illness is not a joke
Replies: 17
Views: 790

Re: This illness is not a joke

I hope you get well soon, buddy. :roll:
by dorrisant
Sun Feb 04, 2024 9:04 pm
Forum: Dumble Discussion
Topic: CF driver Va - Vk voltages in SSS consensus?
Replies: 76
Views: 4057

Re: CF driver Va - Vk voltages in SSS consensus?

I have built a few amps that are gigged and played quite regularly over the past 4-5 years. All of which were built or converted to Martin's bipolar supply. None of them have had any tube failures or any other failures. Loud, punchy and clear as a bell, they all get along lot of attention out in pub...
by dorrisant
Tue Jan 30, 2024 12:07 am
Forum: Technical Discussion
Topic: Parallel triodes
Replies: 19
Views: 14127

Re: Parallel triodes

... looks around for any evidence of something that once existed. This was not possible, since if anything was left at all, it was just a vapor. A vapor that was only noticable if looked for.

Haha. I guess I missed it. :shock:
by dorrisant
Sun Jan 28, 2024 3:20 am
Forum: Technical Discussion
Topic: Faceplate Materials
Replies: 20
Views: 6577

Re: Faceplate Materials

You can get the same result without electrolysis by using sodium persulfate or ferrochloric acid. Put it in a container and wait... Maybe a little bit of stirring/agitation.

Raja_Kentut, not to take anything away from your results. It looks fantastic!
by dorrisant
Thu Jan 25, 2024 1:26 pm
Forum: Dumble Discussion
Topic: 3rd Gen started
Replies: 93
Views: 7540

Re: 3rd Gen started

martin manning wrote: Wed Jan 24, 2024 11:25 pm An 8 ohm load on a 4 ohm output is going to be harder on the power tube screens, especially if you play at near full power.
Hey Martin, what is your reasoning for this?
by dorrisant
Tue Jan 23, 2024 10:56 pm
Forum: Garage Talk
Topic: F*cking clients
Replies: 23
Views: 1336

Re: F*cking clients

Yes, xtian, kudos for choosing clean response words. It makes you look as intelligent as you truly are. Also, great suggestions from the lot of you. I think you have done well with your responses, getting to the point quickly. You must feel some comfort with your messages hitting the target. The onl...
by dorrisant
Mon Jan 22, 2024 8:38 pm
Forum: Dumble Discussion
Topic: Overdrive Deluxe amp
Replies: 65
Views: 39738

Re: Overdrive Deluxe amp

Hello -- If someone wants to post the preamp board dimensions from a blackface or silverface [ ... ] From my 1964 AB763: Overall board dimensions are 14 5/8" x 2 1/2". There are just three bolt through-holes for mounting. These are slightly misaligned across the longer edge. Starting from the power...
by dorrisant
Sat Jan 20, 2024 6:28 pm
Forum: Technical Discussion
Topic: Faceplate Materials
Replies: 20
Views: 6577

Re: Faceplate Materials

That is where I take it another step... Spray it with black paint and then block sand it.