Stew,
Interesting situation there. Not sure I have ever come across a situation like that. Too, you might want to check the grid current meter circuit, it is far more critical than the plate current. And to make things complete, checking the HV calibration is a good idea too. 73, Evan, K9SQG -----Original Message----- From: GALE STEWARD <[email protected]> To: Drake Reflector <[email protected]> Sent: Tue, Feb 19, 2013 1:34 pm Subject: [Drakelist] L4 Plate Meter I have suspected for a number of years that the plate meter in my L4 was reading a bit low. Today I had the amp opened up to make a minor repair and I decided to check. Using a variable power supply, a series resistor, and a DMM in series, I've determined that the L4 meter does indeed read a bit low. As an example, when I adjust the power to give me 400ma on the DMM, the drake plate meter reads ~360ma. The schematic shows the meter to be a 1.0 amp movement and does not appear to have any external shunt resistors. BTW, the meter was disconnected form the amplifier circuitry when I took the current readings. There obviously does not seem to be any way to tweak this but I thought I would ask. This slightly lower reading is not a problem for me but I thought I'd check with the Drake brain trust before buttoning the the amp. TNX & 73, Stew K3ND _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
_______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
