KT120 tubes in AudioResearch ref 300 MK2



Hi

I own the ARC ref 300mk2 mono-amps and i wonder if someone have any experience with replacing the powertubes for the Tungsol KT120.

More specific: Is there enough room because the KT 120 is a bit bigger?
Does it gives problem with the heat?
Is it necessary to replace the filament-transformer,
because the Tungsol needs more current?

What is the soundexperience?

beersum8

Showing 2 responses by bifwynne

Beersum, I own an ARC VS-115 amp and replaced the 6550 "Winged C" tubers with KT-120s. IMO, the KT-120 are a better tube: more head room, better and tighter bass; just better!

Here's the rub. Not all ARC amps are set up to take the switch. Call Calvin at ARC before doing the switch.
That's a shame, but better you asked first. If you ever change out the Ref 300 mkII for another ARC Ref amp, e.g., the new Ref 250, the KT-120s come standard. In any case, I'm sure the Ref 300 sounds great. I hope you continue to enjoy it for years to come.