Hi everyone, doing some repairs at the moment, and have came across something odd. On the amp pcb there are a few pairs of transistors, that have been placed face to face with the flat part of each case touching, and then held together with a piece of heatshrink.
I thought they may have been optical phototransistor couplings, but after looking at the schematics, they just appear to be standard transistors in darlington pair configurations. It even shows on the schematic what pairs are placed together, and in what configuration.
What is the reason for this? Is it for thermal reasons? Capacitive? Electromagnetic? All else I can think of is to prevent vibration relative to each to help reduce noise.
Any thoughts would be appreciated.
I thought they may have been optical phototransistor couplings, but after looking at the schematics, they just appear to be standard transistors in darlington pair configurations. It even shows on the schematic what pairs are placed together, and in what configuration.
What is the reason for this? Is it for thermal reasons? Capacitive? Electromagnetic? All else I can think of is to prevent vibration relative to each to help reduce noise.
Any thoughts would be appreciated.
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