Transistor VBE-matching circuit is ready and
working. Here is a picture of my measurement setup. The desk fan creates
a stream of room temperature air for transistors and the meter.
Transistors are moved with tweezers otherwise the finger-temperature
would ruin the measurements. I let the setup stabilise some 15-30
minutes before measurements. After the transistor is inserted to circuit
I wait also some 1-2 minutes until the voltage stabilises. With my
multimeter I can match the VBE to +/- 1mV. I hope this is enough. I read
that in original ARP-2600 the transistors were not matched at all so
this can not go wrong anyhow.
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