Voltage Readings Question

[surfsup]

I have a 12at7 in v1 and v2 of my amp

For V1, the readings look weird because using the readings I get a big current value for each triode of 1mA and 1.6mA:
V1, Value, Pin, Node, Current (mA)
Pin1, 220k, 38, 261, 1.014
Pin6, 100k, 96, 261, 1.650

For V2 they look better with I=0.53mA:
Pin1, 100k, 235, 288, 0.530

There is a VVR scaling the whole amp on on V1 I have the two extra caps and 1Meg resistors. Does that somehow create a lot of extra current draw?

[surfsup]

Okay I answered my own question, I see the ECC81/12AT7 does draw quite a bit more current, but I find it strange that V2 only draws 0.5mA and V1 draws 2.7mA

pin 1 voltage of 38VDC threw me off.

[rdjones]

If you can swap one socket's 12AT7 for the other, try that to see if currents follow.
Readings will vary amongst tubes but if it's a large amount a tube may be going soft.

I like to take preamp triode current reading off the cathode, after measuring the cathode R.
For one reason the voltage reference (ground, 0V) stays put.

rd

[rdjones]

[surfsup]

I've got a 12ax7 in there now and get 138v at pin1 but I moved the 12at7 to a diff spot so I will remeasure my voltages next time I pull out the DMM. Thanks for that tip.