Search found 3 matches

by GibBFG
Mon Jan 30, 2017 12:19 am
Forum: Series One
Topic: S1-45 Bias PR1
Replies: 6
Views: 14533

Re: S1-45 Bias PR1

Either way, I prefer to take measurements directly from the tubes. That allows me to get the exact plate voltage measurements as well as bias readings as the tubes "see" it...not across other components. Also remember that as you adjust bias, the plate voltage will change. So you need to repeat the...
by GibBFG
Mon Jan 30, 2017 12:08 am
Forum: Series One
Topic: S1-45 Bias PR1
Replies: 6
Views: 14533

Re: S1-45 Bias PR1

The recommended voltage which I got from Blackstar today is: CON1: 50mV Adjust with PR1 on the powersupplyboard. The PR1 on the preampboard shall be just in the middle IF your new tubes are matched. Otherwise, adjust until hum is gone. The Mesa EL34 sound amazing by the way :) /Espen First off why ...
by GibBFG
Wed Jan 25, 2017 1:59 am
Forum: Series One
Topic: S1-45 Bias PR1
Replies: 6
Views: 14533

Re: S1-45 Bias PR1

I am looking to do mine as well and was wondering the same. Please let me know how you make out.Good luck!