Working on JCM 800 heater voltages vary across the tubes ?

S

screamindemon

Well-known member
Hey guys, working on a 100watt JCM 800 2203.
Checking voltages across the tubes and the heater voltages on pins 2 and 7 seem to vary a lot from tube to tube.
Voltages are as follows. They seem to vary a lot wondering if this is a problem ? Thanks

V4 V5 V6 V7
P2 3.09 3.10 3.12 3,15
P3 465 465 465 465
P4 457 457 457 457
P5 -40.5 -40.5 -40.5 -40.5
P6 463 463 463 463
P7 3.07 3.09 3.12 3.16
 
6.16, 6.19, 6.24, 6.31

So 0.03, 0.05, and 0.07 are your delta voltage drops for both wires, or 0.015, 0.025, and 0.035 for each wire, which, given summation of the currents involved, don’t seem unrealistic if your PT heater tap feed begins at V7.
 
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