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ghichtin 20th January 2012 10:10 PM

TCC TC-754 Schematics & Mods
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Hi everyone.
Finally I managed to reverse-engineer the pre-phono board.
I have attached an image of the schematics.
Maybe there are some errors...

This page contains some suggestions for better performances.

Now some questions on the matter.

1) He suggest to bypass the caps near the output (C6 C7 C18 C19 in the schematics). What if I want to get rid of all the MUTE circuit? I'm not interested to put the preamp in standby using SW1. Do you guys think that it's possible to do it?

2) Translated from the page:

Another important modification is the substitution of the phono section input and output capacitors (10mf 50v (sic) and 4.7uF 25V) with some metallized polypropylene 2.2uF
I figured out that they may be C5 & C24 and C12 & C23, even if there are no 10mF caps on the board... (Most likely a typo) Am I right? What about changing the value from 10uF & 4.7uF to 2.2uF?

3) Translated from the page:

To complete the work I've substituted various electrolytics with liquid tantalum capacitors, bypassed some others with polyester of bigger capacitance and substituted the RIAA capacitors with some silver-mica
Is it worth all the trouble (and the cost)?

Comments, advices and suggestions are very welcome.
So long

Henry666 27th November 2012 10:18 AM


Did you do any of the mods?
If so, were they worth the time?


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