audio Research REF 110 and KT 120 tubes

Hi

I have a REF 110 with 6550C tube
i'm looking for someone who heard the REF 110 with new tubes KT120
(i know it's possible to change them, Kalvin from ARC confirmed it)

If yes, how the REF 110 sounds ?

Patrice

atarifr01-14-2011 11:12am

Showing 2 responses by smoffatt

smoffatt Details Discussions Posts This discussion Message User 205 posts 01-15-2011 at 12:24am Copy Comment URL Report Comment Edit Delete I am due for new tubes in my Classic 120's. Wonder if the KT120 would be a drop in as well. It seems that the SED 6550C Winged are really getting scarce. Not too many tube sellers have them anymore and i would need 2 sets of matched Octets. I will call ARC and find out.
smoffatt Details Discussions Posts This discussion Message User 205 posts 01-15-2011 at 10:32pm Copy Comment URL Report Comment Edit Delete Thanks Lostbears. I know. I had to replace one resistor near the pot when i changed tubes from KT90 to 6550C a few years ago as i did not have enough "play" on the pot to bring the bias down to .65ma. The lowest i could go was approx. .70ma. The Classic 120's operate in triode mode vs the REF110 is Ultralinear. The KT120 may not be suitable for the CL120's. I shall confirm with ARC. Thanks again.

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