How two 6550 tubes compare

I have used both the Winged C and TS in my VTL ST-150. In my system I found that the TS had a more robust bass response and the Winged C has a more extended top end. The midrange in both was about equal. It seemed that I got more hours out of the TS before a tube failed. With the Winged C my B+ fuses would blow every now and then. That being said I could live with either happily.

Cheers,
Jim

Camerio,

You can use KT-88s in the ST-150 no problem. Bias to the same range as with the 6550s. I ran the Gold Lion KT-88s in mine for a year and really liked the sound. I did have some tube failures with the GLs, I only had one Tung Sol fail and the SED "Winged C" I never had a fail but they would blow the fuses now and then. Ultimately I went back to the Tung Sols due to the expense of GL and my experience with their reliablity. They were simply too expensive for me to take a chance of trying them again.

I sold the amp before I had a chance to try some of the Shuguang KT-88s but I have read that they sound very good as well.

Cheers,

Jim