RCA Caps

@geoffkait - I guess subtelty is not my strong suit :) Thanks for the award.
After my long time ownership and factory tweaking of the SP-10 preamp, my continued contact with ARC was mainly due to maintenance and refurbishment of my Dual 75a, which is now dormant again, but I bought a whole host of parts for it to be refurbished a few times, the last right before the company got sold. I used to deal with Leonard-- they were always pretty nice to me, and followed up.

@bdp24 Thanks for the pointer, I'll check out the shorting plugs...

whart, it's always a cause for concern when the original owner of a company sells it. Even more so when the owner was deeply involved in the design of his company's products, as was Bill Johnson in ARC's. I know some hardcore tube guys who feel ARC lost their way when they went hybrid (the SP-10 to the SP-11, in particular), and their products were more Rich Larsen's designs than Bill Johnson's. That an amp as old as the D75a, originally introduced in 1973 iirc, is still worth keeping running is a testament to the amp's design, that of Bill Johnson alone.

Just a follow up on my endeavors where RCA shorting plugs are concerned.....

I’ve obtained and installed these:

https://www.amazon.com/Viborg-Audio-Stopper-Plated-Protector/dp/B017DH76VS/ref=sr_1_1?ie=UTF8&qi...

I *cannot* detect a difference in the way my Musical Fidelity noise floor emanates the slightest "hiss" (no music source but volume cranked past 12) with or without the shorting plugs. So I’ll leave them on for "theoretical advantage".

I *can* detect a difference when I put them on the LFE input of my Golden Ear Triton Reference speakers. The otherwise (without caps) slight "wind tunnel breath of air) sound that is typical of speakers with internal amps does not seem to be present or if present has been lowered.

My assumption is that whatever benefit could be obtained by shorting inputs is the same regardless of whether or not the amp is class B or D, correct?

All good in any case :)

Happy New Year everyone!!

I use the Cardas on my Ayre.....absolutely no difference.   I suppose if you need them you do......