2. amps-preamps
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Best KT88s (specifically for VAC Auricle Musiblocs)

I'm using a KT88 based amp for the first time - the VAC Auricle Musicblocs. I just had them serviced but one of the cheap Svetlanas blew, probably from my biasing it too high, and its been replaced by a used Genalex Gold Lion for the moment. The amps sound very good as it is, but I'd like to get the best out of them with a good matched Quad of something decent.

Ideally I would like a little more mid-range luxury and presence without sacrificing too much bass control. However lower bass is not so much of an issue because my speakers have powered subs with an active crossover (Vaughan Cabernet One).

I'm in the UK, and valve selection here is a bit limited. Nobody seems to have Svetlana Winged Cs anymore, and I've read reports of dubious quality in the later batches. Genelex Gold Lion are easy to get from good dealers who can match and measure, so that is the obvious choice. But would I be better of with some Chinese valves such as the Shuguang KT88-98? Are they going to be a bit warmer in sound to the Genelex?

I've read great reports about the Psvane KT88 T2 but they are very expensive. Also the Shuguang Treasures. The riskiest option is to buy these from Mable Audio in China, who have them up for a good price:

http://www.mableaudio.com/en/

From what I have read Kevin Hayes supplied the Auricles with the Shuguang KT88-98. These are very affordable, but I suspect that Kevin only supplies selected ones. 

I could also buy from the US, and I'd appreciate any recommendations for the best source.


andreweast

Showing 2 responses by wrm57

wrm57
985 posts
 
I tried the Gold Lion KT-88s in my 300.1a and did not like them at all--very detailed but too mechanical and hard. The Shugang KT-88SC are much better to my ears, with more bloom and texture along with plenty of detail. But VAC can no longer source them, so they've shifted to the GL. 

Fortunately, after a long search, I found KT-88SC at The Tube Store, labeled as their "Preferred Series."  After six months of steady use, thet have proven far more reliable than the ones VAC was selling toward the end of their supply (I had 4 tubes out of 8 new ones from VAC blow within 6months of light use). Much less expensive than the VAC SC, too.

I like these tubes so much I bought six matched quads. Meanwhile, the GLs (2 matched quads from Jim McShane) sit in a drawer with all of 50 hours on them, unlikely ever to be used. Of course, YMMV.
wrm57
985 posts
 
You are most welcome, andreweast. No, I have never tried the 88-98.
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