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colganr / tr-jm-signature

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Isolated RCA? #1

Open timrobertson100 opened 2 years ago

timrobertson100 commented 2 years ago

Awesome GH repo again @colganr

I was under the impression the SSS and this suffered hum unless you had isolated RCA jacks. On the Fairfield BOM, it looks like you're using rear-mounted Switchcraft, which aren't isolated. If you use shoulder washers and know which, can you please add them to your BOM?

RCA jacks are a bit of a minefield, and often the front-mounted ones are too tall even for 15mm standoffs (touch the board). I've just ordered these which I think (hope) will fit the Amp Nation chassis without drilling.

colganr commented 2 years ago

Good callout! I just updated the BOM with the same jack as well as recommended isolation washers (both from AmplifiedParts). How is your build going, Tim?

timrobertson100 commented 2 years ago

How is your build going, Tim?

Slowly (only due to work travel, kids etc)

Another thing on the BOM - I see 750pF on the BOM but 75pF on the return pot - both seem a long way from the wonderland layout Taylor posted. Can you please confirm which you used @colganr?

timrobertson100 commented 2 years ago

Another thing on the BOM - I see 750pF on the BOM but 75pF on the return pot - both seem a long way from the wonderland layout Taylor posted. Can you please confirm which you used @colganr?

Answering this myself. I see you had 75pF on the overlay you did on TR / Wonderland differences graphic but used 750pF on the Fairfield.

colganr commented 2 years ago

Good question.. to be honest I'm still 50/50 which is the correct value although I am leaning more towards the 750pf. (Mine is built with 750pf and the reverb is phenomenal)

The reason for my hesitation is that the marking on the REAL JM Sig I poked around in, the cap markings was "750" which either means 75pf or 750pf depending on the capacitor "code" to follow with the last number as zero.

On Sat, May 7, 2022, 11:09 AM Tim Robertson @.***> wrote:

Another thing on the BOM - I see 750pF on the BOM but 75pF on the return pot - both seem a long way from the wonderland layout Taylor posted. Can you please confirm which you used @colganr https://github.com/colganr?

Answering this myself. I see you had 75pF on the overlay you did on TR / Wonderland difference but used 750pF on the Fairfield.

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