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Transistor Matching - Dragonfly Alley
https://www.dragonflyalley.com/synth/images/TransistorMatching/ianFritz-transmat0011_144.pdf#:~:text=common%20method%20of%20matching%20transistors%20is%20to%20use,errors%20causedby%20temperature%20variations%20in%20the%20ambient%20surroundings.
Matching Power and Driver Transistors - The Audio Pages ...
https://sound-au.com/transistor-matching.htm
Gain matching should be done at a range of collector currents to ensure that the transistors share the load equally. It is the nature of bipolar transistors that the one that takes the most load (because of higher gain or lower V be) will get hotter, and this will increase gain and lower V be even further, causing it to take even more of the load. Use of a common heatsink ensures that …
Transistor Matching – Trevor's Repair Café
https://therepaircafe.wordpress.com/2021/02/26/transistor-matching/
Transistor Matching. When you get into synthesizers (or any other analog audio related topic), you quite quickly come across designs like VCAs with long tailed pair (LTP) input stages or the famous ladder filters that require you to have so called “matched” transistors. Transistors are usually quite variable (just measure some Hfe (beta) of some to find out), but …
Matching transistors | diyAudio
https://www.diyaudio.com/community/threads/matching-transistors.229190/
If you match the hfe within 10% the most is good. If You in addition match the Vb-e at the same time within 20mV You are even better. I always match mine within just a couple of millivolts. As for Hfe matching I am very careful to match transistors in differential configuration. The numbers You are having there looks fine+ •••
Is transistor matching really necessary for sound ...
https://www.eevblog.com/forum/projects/is-transistor-matching-really-necessary-for-sound-amplifiers/
Matching is needed for an amplifier's front end, the diff amp. In circuit theory, a diff amp always has perfectly matched transistors. Otherwise you get DC offset and higher distortion. Douglas Self shows mismatch above 2% for the collector currents in the front end increases that stage's distortion.
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