2. amps-preamps
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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

Showing 3 responses by ces4x4

ces4x4 OP
16 posts
 
Thanks for the info Marakanetz, curious since it is not labled is it ok to switch between modes while the amp is on?
ces4x4 OP
16 posts
 
Thanks exocet954, I talked to the previous owner and he confirmed its a ground disconnect. Just out of curiousity, have you done any tube swapping? I'm currently using the kt77's and 7199's and what I think is a gz34 as it has no markings. I have a set of el34's but have not tried them. Also, what do you have the bias set at if I may ask? Thanks
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.
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