Are you using a standard 6550 C tube in power stage or have you found other solutions? I'm using 6L6GC at the moment. My humble opinion is that sound is better with 6L6GC (better resolution with same musicality). Any other ideas?
Mkilpi, what do you think of the Tung-Sol 6550? Is it a Tung-Sol original (50-60's version) or a recent version? I've heard some say that a original Tung-Sol 6550 from the 60's is the way to go, though I haven't experimented yet on my own.
Interesting subject. Any thought on Frank's question on the 6H30 tube regarding the audible sonic differences of manufacturer/dating of the tubes? Also applicable to the 6550C?
I need to replace tubes later this year. Would be very interesting to know if a potential audible improvement on the already great (glorious) performance of the ref3 is possible!
I replaced the stock 6550C tube with a NOS Tung-Sol black plate (1950's) with wonderful results. Have not replaced stock 6H30 tubes. NOS tube did take alittle break-in to sound it's best. Nice improvement to an already great line stage.
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