Search found 416 matches

by leadfootdriver
Fri Feb 02, 2024 2:16 am
Forum: Technical Discussion
Topic: Cap across PT Secondary..
Replies: 4
Views: 220

Re: Cap across PT Secondary..

Meh, can't wait forever.. I did both, 1st across the Secondary and together with Caps in parallel with the Diodes. I'm running a Two-Phase Rectifier with 2-pairs on IN4007's in Series. I recorded the noise without, with and with all and looped the recording, and with my dog ears :lol: I noticed the ...
by leadfootdriver
Thu Feb 01, 2024 8:53 pm
Forum: Technical Discussion
Topic: Cap across PT Secondary..
Replies: 4
Views: 220

Cap across PT Secondary..

Old topic I'm sure, but I can't really find a definite answer for a Tube Amp..

I have a 2 phase Rectifier. The Schematic has a 10n Cap across the Secondary for noise. Okay, cool, but I have a pack 20!

Is there any audible benefit to also running them in parallel with the Diodes??
by leadfootdriver
Wed Jan 31, 2024 7:57 pm
Forum: Technical Discussion
Topic: Mesa Boogie Simuclass bias?
Replies: 15
Views: 462

Re: Mesa Boogie Simuclass bias?

Great find!
Hoover dam levels of power reserve..
by leadfootdriver
Wed Jan 31, 2024 7:31 pm
Forum: Technical Discussion
Topic: Need Help with Combo Amp Transformers and Layout
Replies: 5
Views: 175

Re: Need Help with Combo Amp Transformers and Layout

Waiting for some lower voltage Caps to replace the Chunky ones, but it still works..

Image
by leadfootdriver
Wed Jan 31, 2024 4:10 am
Forum: Technical Discussion
Topic: Need Help with Combo Amp Transformers and Layout
Replies: 5
Views: 175

Re: Need Help with Combo Amp Transformers and Layout

Here's a Combo with the OT on the right where V1 is.

Image
by leadfootdriver
Tue Jan 16, 2024 6:54 pm
Forum: Technical Discussion
Topic: This other Flyback Protection..
Replies: 3
Views: 1142

Re: This other Flyback Protection..

Thank you.
Everything I could find pretty much reflects what you said except for the rolling off of the high end.
Electronic Forums talk about using a FBD on Motors or Solenoids..
by leadfootdriver
Mon Jan 15, 2024 12:33 am
Forum: Technical Discussion
Topic: This other Flyback Protection..
Replies: 3
Views: 1142

This other Flyback Protection..

Instead of 3-1KV Diodes like in a TW, there's 1-3KV, cool. But then there's the addition of a 47pfd Cap across it.
What does the cap do in this arrangement?

Image
by leadfootdriver
Wed Jan 10, 2024 7:57 pm
Forum: Technical Discussion
Topic: Output Transformer Impedance Mismatch 6L6 to KT88
Replies: 1
Views: 15519

Re: Output Transformer Impedance Mismatch 6L6 to KT88

I found a great post on the subject from Wilder Amplification back in 2009. https://www.marshallforum.com/threads/various-power-tubes-impedance-info-charts.17125/post-184531 "To find the "rough minimum" plate-plate impedance I square the B+ voltage, then divide that by the plate dissipation rating o...
by leadfootdriver
Sat Jan 06, 2024 3:50 pm
Forum: Technical Discussion
Topic: Output Transformer Impedance Mismatch 6L6 to KT88
Replies: 1
Views: 15519

Output Transformer Impedance Mismatch 6L6 to KT88

Probably another Topic cover many times, but lets keep it alive! :D My next project is building a Deliverance (60) clone with a JCA50 Chassis and Transformers.. I've really flip flopped on the Power Tubes I'll use given the original iron was meant for 6L6's.. A big part of that sound is the authorit...
by leadfootdriver
Sat Jan 06, 2024 3:26 pm
Forum: Technical Discussion
Topic: 6L6 vs KT66
Replies: 26
Views: 27026

Re: 6L6 vs KT66

Dunno.. I don't have it all together yet. But I'm flip flopping on Power Tubes.
I'll start another Topic..
by leadfootdriver
Sat Jan 06, 2024 2:41 am
Forum: Technical Discussion
Topic: 6L6 vs KT66
Replies: 26
Views: 27026

Re: 6L6 vs KT66

Would I use the same Screen and Input Grid Resistors from the 6L6 when switching to KT66?

The amp I have uses 470R for the Screens and 2.2K at G1..
by leadfootdriver
Wed Nov 29, 2023 1:08 am
Forum: Trainwreck Discussion
Topic: Changed the Input Grid Stopper to 68K
Replies: 6
Views: 2211

Re: Changed the Input Grid Stopper to 68K

I switched the Preamp Tubes to Baldwin labeled Sylvania's with the Fane Speaker.. More rich, less pointy..
I think I like these better..

https://soundcloud.com/midnightlaundry- ... e-sylvania
by leadfootdriver
Sun Nov 26, 2023 10:50 pm
Forum: Trainwreck Discussion
Topic: Express vs Asteroid? Komet?
Replies: 26
Views: 3453

Re: Express vs Asteroid? Komet?

^^^ LOL
by leadfootdriver
Sun Nov 26, 2023 10:01 pm
Forum: Trainwreck Discussion
Topic: Changed the Input Grid Stopper to 68K
Replies: 6
Views: 2211

Re: Changed the Input Grid Stopper to 68K

68k grid stopper will introduce hiss. Merlin suggests to use 10k and add a cap to obtain the desired high frequency response / RF rejection. http://www.valvewizard.co.uk/gridstopper.html I actually removed that very arrangement to add the 68K. For me the extended highs are to much glaze on the soun...
by leadfootdriver
Sun Nov 26, 2023 9:57 pm
Forum: Trainwreck Discussion
Topic: Changed the Input Grid Stopper to 68K
Replies: 6
Views: 2211

Re: Changed the Input Grid Stopper to 68K

Colossal wrote: Sun Nov 26, 2023 8:43 pm F70 for the win. Nice playing!
Cool. Glad you like it.. :D