Input transformer for Grampian 636 preamp

[Urskov]

Posted in another thread in the Drawing Board subforum, but seeing as the experts of iron are most likely in this subforum, I'm reposting some of it.

Me and an internet partner are making a clone of the Grampian 636 preamp that has a transformer with (at least to me) unclear specs.

Does anyone have a suggestion for a suitable transformer based on these schematics and specs?

Schematic: https://soundgas.com/wp-content/upl...pian-Reverberation-Unit-Type-636-DEST4328.pdf
Technical docs https://soundgas.com/wp-content/uploads/2019/01/Grampian-Reverberation-Unit-Brochure_p1.pdf

 

[bobober]

Did you ever get anywhere with this mate?

 

[Urskov]

No, I didn't! And no wonder no one replied - the schematic link don't work.

But a guy named Jahlousie contacted me and is looking into it.

If anyone else is interested in this very intriguing circuit that according to afficionados work excellently as a saturation box, too, here's the real schematic:
https://soundgas.com/wp-content/upl...pian-Reverberation-Unit-Type-636-DEST4328.pdf

 

[soundsactive]

I reached out to Soundgas at the beginning of the pandemic trying to do this distortion circuit and never heard from them.

A friend hooked me up with a Gates AI-10426T / + AI-10426C to use at the microphone input to this. I never got anywhere with the project, happy to join ya and see if we can concur it!

 

[Jahlousie]

Still on Board, but changed my Job, so i didnt find much time to build up the testcircuit. But when i ive done it ill post you the mesearuments.

Greeetings to the new comrades in arms

 

[manulaudic]

@Jahlousie hey mate, did you edn up building the testcircuit? I'm intrigued !