Quadrafuzz (Anderton)

[gordo]

It's a bit of design exercise for me but I'm dropping the original Anderton Quadrafuzz into Eagle to see what kind of layout options I can come up with.  I built the Blue Monster and never really warmed up to it and may have a similar response to this thing, but like I say, just flexing my layout skills here.  Or lack of them.

Is there any reason not to replace the RC4136?  I mean, there's an Anderton legacy and since I started with EPFM in the first place is there a sonic difference not to move over to a more modern op amp?

Im kinda having fun just doing the schematic portion of this using the PAIA schematic so it's a nice mind workout.

[alanp]

The 4136 has a... unique... pinout, so you might want to design for a more standard TL074 pinout. Depends whether you want lo-fi or not (the 4136 is basically four 741 opamps.)

[davent]

Shocked to see Mouser still stocks them, i guess for all those people building Anderton circuits.
dave

[gordo]

Yeah, maybe I'll go with the 074.  I don't recall ever thinking "gee, if only it sounded like a 741..."  That and I have ONE RC4136 and would need more.

Thanks

[ChainsawFuzz]

The TL075 is a TL074 with a 4136 pinout. For what THAT'S worth.

The 4136 is substantially lower noise than a 741. It's not much faster, though.

If you crank it enough that the filters are clipping and not just the clippers, the opamp will affect the sound quite a bit. Below that level, the clippers themselves obscure most op-amp differences.

Good luck with it.

[gordo]

ChainsawFuzz coming out of the gate hot!!  Thanks for the input!  And welcome aboard.

[alanp]

The TL075 is a TL074 with a 4136 pinout. For what THAT'S worth.

Thanks muchly for that, Chainsaw -- I'm working on a Buchla 208 clone that has 4136 everywhere.

[davent]

The TL075 is a TL074 with a 4136 pinout. For what THAT'S worth.

Thanks muchly for that, Chainsaw -- I'm working on a Buchla 208 clone that has 4136 everywhere.

Mouser & Digikey have hundreds of 4136's ready to ship at $1.50us per, quantity discounts start with 10 pcs.

https://www.digikey.ca/product-detail/en/texas-instruments/RC4136N/296-9649-5-ND/380283?cur=USD&lang=en
https://www.mouser.com/ProductDetail/Texas-Instruments/RC4136NE4?qs=%2Fha2pyFaduguj9Ift3tCqjLf8YyqXpvZSPoYsWnwMUfR69ndszOWeA==&utm_source=octopart&utm_medium=aggregator&utm_campaign=595-RC4136NE4&utm_content=Texas+Instruments
dave