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Improve a Rotel amp THD by 20dB!
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Old 29th June 2019, 09:18 PM   #361
StewartH83 is offline StewartH83  England
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Hi Chris

Much appreciate your advice again. I'll leave that capacitor alone then as it don't seem worthy and only wanted to see if anything benefits the sound.

I've been reading this post again to be clear. Takes alot to soak in learning new things as I get older haha
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Old 29th June 2019, 09:23 PM   #362
anatech is offline anatech  Canada
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Improve a Rotel amp THD by 20dB!
Hi Stewart,
Quote:
Takes alot to soak in learning new things as I get older
It's the same for all of us. No worries.

-Chris
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Old 16th July 2019, 10:44 AM   #363
AngelP is offline AngelP  United Kingdom
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Originally Posted by AngelP View Post
Anyway, here's two "before and after" pics. Cosmetically you could call it "barn find" to "concourse level" - but regarding audio quality it is more like "beam me up".
Per

One interesting thing in the "before" picture in post #356 is the manual addition of a R-C filter between the LTP bases in this late RA-930AX production amp. Note the sharing of the LTP base pcb holes with the filter components. Would probably have been tricky in mass production.


Anyway, this filter was implemented in all later Rotel models and for good reasons. There is a nice TI article that explains the basis of such an input filter at:

http://www.ti.com/lit/an/slyt631/slyt631.pdf
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