STEP UP TO THE 100 CAYIN
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Have you tried tube rolling? I have this amp and put Genalex Gold Lion KT88 tubes in it. I like the combo.
Also, the amp will accept 6550 tubes, but you have to reset the bias. Some owners prefer the sound of 6550's to KT88's
I also replaced the 6SN7 and 6SL7 tubes with NOS Sylvanias. This did improve the sound, but not to the extent that replacing the power tubes did.
Agree with Catama about trying some tube rolling. I also use the Genelex Gold Lion reissues and they made a marked difference to the sound - bottom end tightened up, more forward in the mids and overall a more balanced sound. Also tried NOS Sylvania 6SL7GT/VT229 and some NOS Amperex 6SN7's. The Amperex also made a big difference - more so than the 6SN7's.
Having said all of the above, if there is a power mis-match with your speakers, look at the more powerful Cayin (A100-T) or perhaps the Rogue amplifiers.
As far as the impedance goes, it is 8ohms nominal, dipping down as far as 6.5, and 90db/w.
Thanks for all of the suggestions. I was considering some tube rolling, but figured I wouldn't mind a bit more juice, no matter what. Looking at around 60 watts or more. The preamp tubes have already been rolled, but I wasn't using the pre section, only the amp. As it worked out, I found a great deal on an Atma-Sphere M60, so I am going to give that a shot in my system and see how it compares.
I think the M60s are close to the best amplifiers I have ever used; should be interesting to get your impressions - I love them and I have been through a lot of gear - they were the first amps that got me to sell my CAT JL2s without looking back, then again my speakers (Merlin VSMs)are very OTL friendly. Good luck. Oh, by the way, I don't think you will have any bass issues with the M60s:)