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TC Phono-Pre Reverse-Engineering/Mods/Tweaks

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OJneg:






More to come

Marvey:
Replace C2 with higher quality cap. It's an electrolytic. It probably doesn't need to be 10uF.
Replace C8 with a bigger and higher quality cap.
Bring in power to right after R16. No need for D1, R16, C10, C9. (Note both C10 and C9 are marked incorrectly. Boom! if they were actually installed like that.)
Play with C1 and/or R2 depending on your cart.

Mr.Sneis:
Very interested in how this ends up.  What's the goal with the mods?

OJneg:

--- Quote from: Mr.Sneis on September 01, 2015, 12:11:44 AM ---Very interested in how this ends up.  What's the goal with the mods?

--- End quote ---

Do silly audiophile things. See if they make a difference

Solderdude:
On top of Merv's recommendations may I add the following suggestion.
(Although that may change the actual RIAA correction)

I would change point where the RIAA feedback comes from, from B Q3 to E Q3.

Reason: the output R of Q2 is rather high (and is why Q3 is there).
For low frequencies the load of the RIAA is no problem but for the highest frequencies the load drops to around 3k which results in a different gain for Q2.
On E Q3 the output R is MUCH lower and the difference in load is moot.

Should the RIAA be designed to take this into consideration it may be off in that case.
A simple matter of measuring the response

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