Test results for these tubes vary wildly, it appears. I am using these as an input/driver tube, so level-matching is fairly important. So, would it be better to match for transconductance or plate current?
Quality of sound depends from plate current, IMO.
One tube with different currents sounds different.
One tube with different currents sounds different.
If you build a test rig and sample the DC voltage on the cathodes, that will give you an indication of current flow. It may be of use to vary the control grid voltage and anode voltage. Using a 1M resistor feeding the control grid will allow you to determine the grid current.
Indeed! One day I want to buy and build the uTracer to match tubes.
The uTracer, a miniature Tube Tester / Curve Tracer.
Hi!
The easiest and cheapest way is to match the tubes in the actual circuit.
Measure current and gain.
Thomas
The easiest and cheapest way is to match the tubes in the actual circuit.
Measure current and gain.
Thomas
The uTracer looks very nice. I will add that to my project list.
Guess I will use the circuit for matching. What is the best way to measure gain? Just AC in vs. AC out?
Guess I will use the circuit for matching. What is the best way to measure gain? Just AC in vs. AC out?
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