subject:"\[Drakelist\] Drakelist Digest, Bias current Low"

Re: [Drakelist] Drakelist Digest, Bias current Low

2011-07-05 Thread Garey Barrell

Fred - The first thing that comes to mind is that ONE of the PA tubes is DEAD. You can check by measuring the voltage across R32 or R33 in TUNE. Other possibilities are an open Screen or Cathode resistor (R30, 31, 32 or 33) Another possibility is that the HV power supply (AC-4), isn't.

Re: [Drakelist] Drakelist Digest, Bias current Low

2011-07-04 Thread FJMelick

Bias and plate current is low on Drake B Line. Adjustment on back of AC 4 is turned up full. Plate current is only .210 mills. Bias is .04 on plate meter. Any ideas where to start to look for a cure. Thanks 73 de Fred WD8ADG ___ Drakelist