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Replacement for SED 6550C Winged C

 I am now using SED 6550C winged C from 2008.  I really love the tone texture of these tubes.

I am having some trouble with my set (4) of these tubes and would like to get a replacement, however I am not finding the exact replacement, made in St. Petersburg, at a reasonable price from a trustworthy dealer.  I could get a set from  Russia but I prefer to try domestically first.

Consequently, I am asking if any of you, having experience with this tube, if you know of another tube that has such tone and texture.  I focus primarily on vocals.

chinook9
vegasears
1,173 posts
 
I switched from SED 6550C Winged "C" to Gold Lion-KT-88's for my VTL amps many years ago.  They are a bit warmer with better bass. I enjoy them so much I've not considered trying another brand of tube.
williampowell
23 posts
 
Also use NOS JAN GE 6550. Winged C 6550 do come up from time to time from US Resellers. 
chinook9 OP
68 posts
 
The SED Winged C 6550 (c I believe) made in St. Petersburg is my favorite tube, but I was unable to find a quad that worked.  I purchased a quad from a US vendor and they each red-plated to one degree or another.  The vendor replaced them, but the second quad did the same thing and I received a full refund.

I gave up on the Winged C and tried a set of Psvane KT88-TII. I like them enough that I am sticking with them, but I would buy a set of Winged C in a heartbeat if I could find a good set.
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