Search found 2416 matches

by soulsonic
21 Jun 2023, 03:03
Forum: DIY Projects
Topic: First Time Member...Help with wiring up a Newmarket Transistor amplifier circuit
Replies: 2
Views: 543

Re: First Time Member...Help with wiring up a Newmarket Transistor amplifier circuit

I'd like to add that it's wasn't accurate for them to call it a "Deacy" amp. The Deacy amp circuit uses two small transformers: one to drive the push-pull output transistors, and the other is the output transformer. You see this alot in old transistor radios. If I had this, first thing I'd...
by soulsonic
25 May 2023, 02:14
Forum: Modern Stompbox Effects (1975 - ...)
Topic: BOSS DS-1W waza craft [schematic]
Replies: 10
Views: 4004

Re: BOSS DS-1W waza craft [schematic] [schematic]

I can tell you from experience that you can solder the 880 to the footprint for a SOT-23, but you have to be very careful. Don't sneeze on it. :lol:
by soulsonic
24 May 2023, 00:45
Forum: Modern Stompbox Effects (1975 - ...)
Topic: BOSS DS-1W waza craft [schematic]
Replies: 10
Views: 4004

Re: BOSS DS-1W waza craft [schematic] [schematic]

Thank you for your work! An early birthday present for me! :D It's exciting to see 2SK880 being used in a commercial guitar pedal. This is the first time I've seen it used in a pedal outside of my own designs. I started using them a few years ago when 2SK117 became impossible to get, and I really li...
by soulsonic
21 May 2023, 20:11
Forum: Amplifiers
Topic: Fake 6l6gc's
Replies: 5
Views: 2436

Re: Fake 6l6gc's

Yo! I have the "Mullard" version of these! "Factory matched" pair in original boxes. I got them in the late 90's from a hi-fi shop in Chicago I used to work at - they were just hanging out in the stock room and looked pretty old even then. The boss was not a big tube fan, so we d...
by soulsonic
17 May 2023, 01:12
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Maxon - PH-350 Rotary Phaser
Replies: 22
Views: 16614

Re: Maxon - PH-350 Rotary Phaser

Sorry, I had taken these photos back in 2009 when I had worked on one of these to modify it for true bypass. Completely forgot about it.
I didn't take any photos of the board with the controls, sorry. :oops:
DSC01722.JPG
DSC01723.JPG
by soulsonic
05 May 2023, 12:46
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Harley Benton - PA100 Power Attenuator [schematic]
Replies: 41
Views: 43837

Re: Harley Benton - PA100 Power Attenuator [schematic]

Something that I don't like at all in the PA100 and what I don't like is that the volume for the line output is the same as that of the attenuator, that is, the attenuator is at 1 and the line volume potentiometer is at 10. .. listen with very little volume connecting it to a sound card. I mean, I ...
by soulsonic
02 May 2023, 22:54
Forum: DIY Projects
Topic: Ammo Can Reactive Load
Replies: 20
Views: 7253

Re: Ammo Can Reactive Load

It won't let me edit the original post with the new schematic, so here it is:
AmmoCanLoad_rev1_1.JPG
by soulsonic
02 May 2023, 15:15
Forum: DIY Projects
Topic: Ammo Can Reactive Load
Replies: 20
Views: 7253

Re: Ammo Can Reactive Load

UPDATE: I found why the transformer was reversing the polarity. The mistake was in the schematic drawing from Edcor. The diagram they provided showed Pin 5 being Hot and in 7 being ground, but it is actually supposed to be the opposite of this. I will update my schematic with the correct pin numbers...
by soulsonic
02 May 2023, 13:15
Forum: Pedal Debugging & Troubleshooting Support
Topic: Cili War Big Muff clone - pedal dies and produces weird static noises
Replies: 1
Views: 269

Re: Cili War Big Muff clone - pedal dies and produces weird static noises

Does it get better or worse if you wiggle the transistors in their sockets? The synth noise when you roll down the drive is going to be some kind of oscillation. Oscillations in high gain pedals are nearly always caused by layout issues. You said it wasn't making that sound when it was outside the b...
by soulsonic
30 Apr 2023, 18:28
Forum: DIY Projects
Topic: Ammo Can Reactive Load
Replies: 20
Views: 7253

Re: Ammo Can Reactive Load

Got to thinking, A good budget approach, or at least easy if you don't want to start from scratch, could be to mod a prebuilt cheap attenuator, like a Harley Benton PA-100, with the reactive parts? But i guess it could be hard to fit? Problem is there's no reactive parts in that thing. The inductor...
by soulsonic
26 Apr 2023, 15:13
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Harley Benton - PA100 Power Attenuator [schematic]
Replies: 41
Views: 43837

Re: Harley Benton - PA100 Power Attenuator [schematic]

Interesting conversation about the HB Pa 100, I just received one, I opened it, and the first question I ask myself is, is it possible to increase its power, I mean, if now it only supports 100w, ok. How to modify it so that it supports more power? For example: if I connect a 200 or 300w amplifier,...
by soulsonic
24 Apr 2023, 17:39
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Harley Benton - PA100 Power Attenuator [schematic]
Replies: 41
Views: 43837

Re: Harley Benton - PA100 Power Attenuator [schematic]

Interesting conversation about the HB Pa 100, I just received one, I opened it, and the first question I ask myself is, is it possible to increase its power, I mean, if now it only supports 100w, ok. How to modify it so that it supports more power? For example: if I connect a 200 or 300w amplifier,...
by soulsonic
24 Apr 2023, 02:29
Forum: DIY Projects
Topic: Ammo Can Reactive Load
Replies: 20
Views: 7253

Re: Ammo Can Reactive Load

Back to the attenuator. I found the Edcor transformer is the cause of both the reversed phase and the distortion at low frequencies. That's a bummer. I checked and double-checked that my wiring on the transformer was correct - it must be a matter of them having wired the pins wrong. I don't know wha...
by soulsonic
24 Apr 2023, 02:18
Forum: Electric Guitar/Bass Wiring
Topic: Preventing audio bleed in a stereo output
Replies: 7
Views: 1380

Re: Preventing audio bleed in a stereo output

Looks like what I suggested won't work, because you have both channels sharing the same ICs. Each channel would need to have its own for what I suggested.
And maybe sharing the same ICs amongst both channels is the cause of your problem in the first place.
by soulsonic
17 Apr 2023, 21:59
Forum: Electric Guitar/Bass Wiring
Topic: Preventing audio bleed in a stereo output
Replies: 7
Views: 1380

Re: Preventing audio bleed in a stereo output

That imgur thing does not work for me. Please upload all images here as attachments.
by soulsonic
17 Apr 2023, 13:10
Forum: Amplifiers
Topic: Traynor YVM-1 Issues
Replies: 7
Views: 1227

Re: Ammo Can Reactive Load

Remember electrons flow to the Highest voltage potential. :hmmm: Any power Valve would burn through the screen rapidly if the Plate voltage ever falls lower than Screen voltage. As the amp is old the plate pin might be arcing across the socket somewhere which will pull plate voltage down. And I wou...
by soulsonic
17 Apr 2023, 00:33
Forum: Electric Guitar/Bass Wiring
Topic: Preventing audio bleed in a stereo output
Replies: 7
Views: 1380

Re: Preventing audio bleed in a stereo output

If you insert a simple RC filter in series with the power going to each preamp, this could decouple the two channels from one another well enough to stop the problem. I would try a 150ohm resistor with 100uF electrolytic cap to ground. You'd split the line coming from the power and feed each channel...
by soulsonic
17 Apr 2023, 00:15
Forum: Amplifiers
Topic: Traynor YVM-1 Issues
Replies: 7
Views: 1227

Re: Ammo Can Reactive Load

Oh dear, As the Amp has already had Screen grid issues then the sockets may have hair line carbon traces (which you can't see) and once that happens it's likely the new tubes will arc again along the same path, in which case it's a Socket replacement. Also worth note is that EL34's are notorious fo...
by soulsonic
16 Apr 2023, 22:44
Forum: Electric Guitar/Bass Wiring
Topic: Preventing audio bleed in a stereo output
Replies: 7
Views: 1380

Re: Preventing audio bleed in a stereo output

Does each preamp have it's own power filtering/decoupling? It might be the signals are getting mixed together via the power circuit. More filtering and decoupling can solve that if that's the cause.
by soulsonic
16 Apr 2023, 20:27
Forum: Amplifiers
Topic: Traynor YVM-1 Issues
Replies: 7
Views: 1227

Traynor YVM-1 Issues

I'm feeling reassured that the Ammo Can load wasn't responsible for my amp blowing a tube. I stuck another set in there (EL34s this time), rebiased, checked all voltages, etc... Biased at 70% dissipation, I ran a sine wave directly into the phase inverter and got a very nice clean symmetrical since ...