6s33s on uTracer

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Hi guys,

I had just done my first test with 6s33s on my u-Tracer using obviously external DC PSU.
I set mesurments for 120V at 150 mA, -45V Ug1.
The curves seams to be nice but doing the fast testing, I was not abble to set plate resistance (120ohms) and target mu(amplification factor) so obviously errors occure especialy for gm which for me is the criteria in matching those tubes.

What shall I do?
 
Some pictures of my tracer:
 

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Wow, the differences are quite large! What happens if you put them in the actual circuit, do the current really differ by that much?
This is only one tube at difrent Vg (-50, -46, -44 V) and the corespondent gm(see the doted curves.
Prior to finish that tracer, I use a primitive banc to check al the tubes I have at the actual OTL values (150V, 200mA, -50V) and the result was promising
 

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