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NOS ECC82 and ECC83 tubes for Unison Research amps

Can anyone share his experience in replacing the stock Electro Harmonix ECC82 and ECC83 tubes in Unison Research amplifiers with NOS tubes?
Are Electro Harmonix decent tubes or it's better to use NOS tubes? Do ECC83 tubes influence the sound?

As regards ECC82/12AU7 tubes, I have Mullard CV4003, GE 5814 three mica grey plates and RCA 6189 three mica black plates.

I'm just hesitating to start the tube-rolling race. The amp sounds fantastic very dynamic and clean, if a bit dry and cold as compared to Cary SLI-80.

Any advice will be appreciated!
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Showing 1 response by paturalski

paturalski
1 posts
 
hi there,

I've also got UR Unico Nuovo and has replaced Electro Harmonix with NOS (late '50s) RCA CONN clear top. My speakers are Triangle Magellan Duetto mk2. The system has acquired much more detail, punch, air and the feeling of presence what I'm finding very positive. Unfortunately the top frequencies are way to agressive...

Can anyone advise which tubes should I buy to keep the resolution, air, punch and presence offered by RCA CONN Clear top, but more relaxed, refined and more "sweet" trebles?

My music is most frequently: jazz, symphonical, opera.

Thanks!!!
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