Reducing the mains input probably wouldn't make any difference to tube life. Regarding the bias setting, changing this would only shift the class of operating the finals a tad from the design spec if any. Can't see much to be gained from doing either. Why not just use the rig and enjoy it? JB
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Michael A. Kelly Sent: Saturday, 12 November 2011 1:54 PM To: [email protected] Subject: [Drakelist] Bias Adjustment on TR4CW Question 1: Would tube life be extended if I ran my TR4Cw at 108-110 Volts AC instead of 120VAC? (All of the 21 tubes, not just the transmitting tubes?) I have access to a variac and could do it easily. Has anyone else done this? Obviously output would suffer a bit, but I typically run 90-100 watts maximum anyway. Aside from less possible total power output, is there a downside here? Question 2: When you adjust the PA Bias to 0.1 what exactly is that doing, decreasing the voltage similar to a variac? Does it affect all tubes, or just the finals? If so, again, why not turn it down to say 0.009 instead of 0.1 and again extend tube life? Thanks, Michael Kelly N4MAK _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
