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- Thu Jul 29, 2021 9:02 am
- Forum: Technical Discussion
- Topic: Rotary Impedance Switch Source
- Replies: 17
- Views: 3424
- Sat Jun 12, 2021 4:49 am
- Forum: Technical Discussion
- Topic: What is the most aggressive transformer you could put in a superlead, and why in your opinion?
- Replies: 27
- Views: 2562
Re: What is the most aggressive transformer you could put in a superlead, and why in your opinion?
You didn't say power or output transformer, but I'm guessing you meant output. Personally I think this is a fool's errand (no offense), and that changing a transformer out for one you already think sounds fine and is good quality is a lot of effort and expense for an imperceivable difference in soun...
- Sat Jun 12, 2021 4:41 am
- Forum: Technical Discussion
- Topic: Help calm the relay down
- Replies: 17
- Views: 1423
Re: Help calm the relay down
Yeah, I agree it's unacceptable as well, but Friedman hasn't been a "factory" for that long, being a "boutique" modder/builder for many years. Circuit flaws in the boutique world is often see excused as "quirks" rather than what they really are - bad design.
- Thu Jun 10, 2021 1:23 am
- Forum: Technical Discussion
- Topic: Help calm the relay down
- Replies: 17
- Views: 1423
Re: Help calm the relay down
The real amps do this too. It's a bad design tbh. Freidman changed later models to have a 2.2M in place of the 10M pull down resistor. There is also 10uF cap in series with a 100R resistor across the relay coil, which helps slow down the relay a little. I don't think you'll ever get rid of the pop c...
- Fri May 28, 2021 8:00 am
- Forum: Technical Discussion
- Topic: Twin Reverb RI buzzy undertones
- Replies: 9
- Views: 1208
Re: Twin Reverb RI buzzy undertones
May be helpful if it was the same noise I was hearing. https://music-electronics-forum.com/forum/amplification/guitar-amps/theory-design/932727-strange-solution-to-ugly-distortion Also try removing the reverb tube just to rule out the reverb circuit causing it. If you search you’ll find it’s another...
- Sat Nov 07, 2020 9:19 pm
- Forum: Technical Discussion
- Topic: Panasonic ECW/ECQ capacitors
- Replies: 11
- Views: 2768
Re: Panasonic ECW/ECQ capacitors
Those Panasonic caps are more than okay, and many people do use them for tube amps. It's not that they are cheap, it's more that they are not overpriced
- Mon Jun 29, 2020 5:08 am
- Forum: Technical Discussion
- Topic: dC on presence Pot
- Replies: 7
- Views: 1247
Re: dC on presence Pot
It’s normal for all Friedman amps - old school Fender/Marshall presence Control. It has a much better taper than the “new” type, and frequency breakpoint changes depending on setting (in a good way).
- Wed Aug 28, 2019 8:10 am
- Forum: Technical Discussion
- Topic: Effect loop level
- Replies: 8
- Views: 2269
Re: Effect loop level
There are lots of good ways to do an effects loop. Even passively buffered ones (using a simple voltage divider to knock down the voltage and get a low-ish impedance) like in Cornford amps seem to do a fine job. If you have any volume control before the loop then it's acting like a send level contro...
- Mon Aug 26, 2019 4:48 am
- Forum: Technical Discussion
- Topic: Effect loop level
- Replies: 8
- Views: 2269
Re: Effect loop level
I think the point you are missing is the recovery stage. You do need to drop the level way down to instrument level for FX pedals, but then you need to boost it back up to where it was (this can be done with a tube gain stage or more transparently with a transistor). The loop in the 800 reissue is g...
- Sat Aug 24, 2019 9:15 am
- Forum: Technical Discussion
- Topic: Favorite Ways to Control Compression
- Replies: 59
- Views: 5425
Re: Favorite Ways to Control Compression
Just to play devils advocate, I think my approach would be a non expanding compressor pedal with a blend control before the amp or even in the effects loop. All these other methods are valid, but will only work when the amp is cooking at a certain level. I've had the best results control screen volt...
- Wed Apr 03, 2019 8:29 pm
- Forum: Marshall Discussion
- Topic: Friedman Butterslax with popping noises in effects loop
- Replies: 25
- Views: 6951
Re: Friedman Butterslax with popping noises in effects loop
That's strange. 15 seconds seems more reasonable. There is DC until C2 charges up, which shouldn't be that long since C2/R1 are not too large.
- Wed Apr 03, 2019 1:34 am
- Forum: Marshall Discussion
- Topic: Friedman Butterslax with popping noises in effects loop
- Replies: 25
- Views: 6951
Re: Friedman Butterslax with popping noises in effects loop
Did you ever get this resolved?
- Thu Oct 04, 2018 7:40 am
- Forum: Technical Discussion
- Topic: Need schematic drawing program
- Replies: 15
- Views: 4122
Re: Need schematic drawing program
Dr. Z asking is asking us for cheap schematic software recs? I am so confused.
- Tue May 15, 2018 8:09 pm
- Forum: Technical Discussion
- Topic: Cliff Jack Issues
- Replies: 12
- Views: 1890
- Wed Apr 26, 2017 12:09 am
- Forum: Technical Discussion
- Topic: Presence Pot 5K vs 25K
- Replies: 67
- Views: 12079
Re: Presence Pot 5K vs 25K
Just dropping in to say the 5K scratchy pot is much better in every way except the scratchy pot part Next best is the nonscratchy arrangement with a 10KA pot ala Sunn Model T.