Hello all, I haven't been here in a long while.

I have an idea and was wondering if anyone has some input.

I got an idea bouncing around in my little mellon...

I was to build an All tube Diezel VH4 Channel 3 preamp.

I came across a supposed VH4 schematic in the deep dark corner of the web... not sure if it is accurate.

The thing that makes me wonder about the schematic:

-The tone Stack BASS is wired (or drawn on the schematic) Oddly
-367VDC on the 12AX7 Plates is pretty cooking...

Hi! I have an interesting device. I started working on drawing his schematic. Everything is clear. Give me time and I'll draw a diagram. If someone already has a scheme, we will cooperate. :horsey:

Anybody know what causes what seems to be an energization problem with these PDS pedals? The pedal will turn on instantly and light up, but the effect doesn't function until maybe 10 or so seconds. Switch to a different delay timing, and the issue starts all over. I've replaced all the aluminum caps but the issue pertains. One PDS pedal in the past had the same issue yet corrected with new caps. I have another chorus pedal of a different brand that has the same issue, but the caps are also...

I was having issues with a parallel looper design and asked for advice a while back to help eliminate switch popping and circuit noise. The attached file shows a pop-free version; the switch popping finally disappeared after removing all pulldown resistors. The guitar signal was too quiet, though, and the circuit had a high noise floor. Although the schematic doesn't show it, I was using a voltage doubler.
The second file was a redesign using lower noise op amps and other changes. The...

I'm posting this here for the benefit of the community. It's my own idea of what a Rockman headphone amp should be like, made with modern, easily available components. It is intentionally not an exact clone of any specific Rockman model, because my aim right from the beginning was to make it better. I'd say it's closest to an X100 without the Echo part, but with a nice feature from the Soloist (the Doubler mode), and another really nice feature from the Ace series: single 9V battery power. I...

PDF: 1979-4 Guitar Expander - Electronics Today International.pdf

1979-4 Guitar Expander - Electronics Today International 1.jpg 1979-4 Guitar Expander - Electronics Today International 2.jpg 1979-4 Guitar Expander - Electronics Today International 3.jpg 1979-4 Guitar Expander - Electronics Today International 4.jpg

this is wha should be its pcb.
it is described as based on a fuzz face.
3 transistors...mmm
anyone has schematic? maybe some tonebender variation?

Hey guys,
I ran a small outlet on ebay in 2020 and finished up early last year. For those who supported me back then, a big thank you.
I have had several people contact me over the last year asking when I'm coming back. I will be back within the next 2 weeks.
For those who purchased a PCB and need the BOM just shoot me a message and I will be more thank happy to help.

Hello.
I have analyzed the schematic of a TBCFX mep3 pedal I have on hand.
The FET was unknown.

I will share it with you since I have it.

I am using translation software for this text.
Please forgive me if the text is strange.

I'm working on VERO layouts for the Blade VSC preamp and I'm also trying to create one for only the Mid-boost part of the preamp which I think is very nice!
Since I'm a beginner I'm learning as I'm going, working with bread board layouts and schematics and trying to create veroboard layouts from there.
It would be great if I could get some help with the layouts I'm creating!

The schematic for the Blade VSC preamp:

I've created this vero layout for it. I've verified the mid-boost part for...

I'm seeking for this pedal since a while. I only know it's a relative of the Roland AF100 BeeBaa (fuzz only, without the booster).
I was able to find a gut shot on reverb, and by roughly comparing it with a regular Roland BeeBaa schematic, I came to the conclusion that it shall be something like this.
PCB is double sided, so I can 't properly tell all the connections.
What do you think?

just wanted to give a heads up of a scam on eBay.

A guy who runs a component shop in Devon, UK, was selling bags of 400 NOS germaniums,.. some sold for over £600.
If you bought these, or know who bought these, PLEASE check them with a professional transistor tester that can detect internal shorts and bi-polar leakage (not a cheap tester off eBay), as one buyer has reported 41% were duds.
Anyone who did buy these can still talk to ebay (who are currently investigating) via the chat at...

PDF: Hobby-Electronics-1979-06-S-OCR Tremolo Unit.pdf

Hobby-Electronics-1979-06-S-OCR Tremolo Unit.jpg

A few years ago I posted the actual hfe of Q1-Q4 from a 1974 Rams Bead Big Muff with FS36999 transistors as measured using a Peak DCA55. They were: Q4: 163, Q3: 214, Q2: 171, Q1: 160.

Since that time I've worked on three more pre-1975 Rams Head Big muffs. Two had FS36999 trannys and one had 2N5133 trannys. Guess what...they all measured less than 200 hfe, lol. The one with 2N5133 trannys were as follows: Q4: 132, Q3: 117, Q2: 145, Q1: 128. I also noticed Kit Rae posted some of his own...