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Will Vincent st-70 upgrade

I just purchased a used beautiful Will Vincent upgraded st-70 power amp. This is my first tube power amp so I am somewhat of a novice when it comes to these units. On the top of the amp between the power supply transformer and output transformer there is a toggle switch. What does this toggle switch do? I don't want to mess with it not knowing its function.
ces4x4
exocet954
98 posts
 
Ces4x4,

I have Gold Lion KT66 tubes. The soundstage just blew the doors open with this amp vrs the EL34's. Have yet to try KT77's Will Vincent recommends bias at 1.40 for EL34/KT66
tubes. Will is a great guy and his amps are awesome. He can be reached at 208-746-9650.
ces4x4 OP
16 posts
 
Thanks exocet954. I currently have the bias set at 1.35 on the KT77's. I believe I will try a set of Gold Lion 66's. So far I am enjoying this tube amp immensly, I have a Mac C220 tube amp running the input side and a pair of B&W CDM9NT's as my monitors.
exocet954
98 posts
 
I've only heard great reports on the Gold Lion KT77's. I switched to Gold lion KT66's several months ago and have been very impressed with the results on the Will Vincent
Stereo 70, Quicksilver Mid Monos and Quicksilver Mono 60's...All the best!
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