We all know that it is an EchoPlex pre (I don't know wich one). But whats the deal with the 3 ways EQ switch?

Calling all Neil Young fans :lol:
Here is the BAJA 5E3 Deluxe 9v overdrive pedal for you :wink:
I designed the vero layout first using forum member bancika's excellent DIY PCB creator software, before building this pedal and it worked first time - lol.
Here is the schematic, vero layout and vero cutting guide (viewed from the track side :wink: ). I bought some vero clone board from a supplier on Aliexpress - a bit cheaper than the genuine vero and it works extremely well too!
enjoy :thumbsup...

Here is the second installment of my bass amplifier series - the Ampeg SVT in 9v pedal friendly format.
Plug this pedal into any high wattage power amplifier and experience the Super Valve Technology sound without tubes :wink:
This design is based on the original Ampeg SVT but with the 5 frequency bands mid boost / cut rotary switch used in the later SLM MkII model.
I left the bass cut option in the ultra bass switch control out as well just as they did in the MkII :wink: However I modeled the...

Would some pics help this thread ?
Here's some guts shots of the Chuck Collins repro which is supposed to be true to the original design:-

Schematic

:horsey:

This is the new standard in quality bass amplification. The thunderfunk 750-A is based off of the origional AMP BH420 , Gibson GB440 amplifiers from the 80's and 90's. In fact, if you look at the amplifier board, it is IDENTICAL to Gibsons' Gb440, and later EDEN bass amplifiers. Since they use the same Sanken 2SC3264 and 2SA1295 Output transistors. Earlier models used the 2SC3858 and its counterpart.

The pictures in this first batch are dumbed down a little much. I can never tell...

I got one of these cause they seemed cool. It sounded alright when I played it so I ended up tracing it to see what was going on under the hood. Going off the other pedals by this brand I'm pretty sure its a clone, not sure exactly what it's a clone of but there are some familiar elements. A TS style soft clipper with switchable asymmetry into a two-band Baxandall followed by a JFET buffer. (Yes, I know there's a gate resistor 'missing' from the buffer, it is not a tracing mistake, and the...

I sent a bunch of pics to AG a while back, but I know he has a lot more important things to worry about these days...

Unfortunately I dont have wiring photos (and I can't remember the name of the guy who sent these pics to me....) , but these should get us close. We'll just have to make an educated guess about the pot values and wiring.

I already flipped the trace side photo.

Have fun.

.. the tittle of this thread being an attempt to play with words, although English is not my mother tongue. :P

I've already posted the explanations below in some long tedious posts or threads in other forums... But it should make more sense here. I'll just keep it relatively short for a first topic. :-)

The Tube Pilot is a cheap tube overdrive, apparently inspired by Butler / Chandler / Tube works Tube Drivers.

Problem: the Tube Pilot doesn't host any tone control nor tone correction for...

I have both a 80s BK garage made Tubedriver and his latest reissue. After trying countless tubes I have discovered the NOS Telefunken ECC81 to give the best results. I have 3 of these tubes and they are extremely consistent providing great tone, mojo, and character to these pedals. To my ears the difference is astounding in both pedals. Yes, they are expensive but do not disappoint. Has anyone else discovered the same result?

There's a few people offering mods for this eq, I dont own one but wondered what kind of thigs they were 'fixing'? higher spec parts? value changes?

Hi
I'm trying to fix a JEN Motorphaser, but I don't have a schedule, does anyone here in the forum have something they could share.

//sven

Here are guts of the original
:thumbsup

anyone have one of these they can open up?

the original 1176 is crazy expensive these days. i thought it'd be pretty elaborate, but looking at the original 1176 schematic, seems like a couple JFETs and a some BJTs. presumably the pedal removed the 5532 differential input. and the marketing doesn't mention any transformers so i guess they skipped that too. runs on +30V and -10V, nothing too crazy.

they're charging $359 for a pedal clone, and i bet most of that price is just based on the...