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Old 24th Nov 2021, 3:48 pm   #15
dave cox
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Join Date: Jan 2009
Location: Bristol, UK.
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Default Re: Wireless World April 1969 Amplifier Kit. 2N3055 Transistors.

A finger on the output transistor(s) will tell you if your heat-sink is up to it. If you can keep your finger on it for, say 2 seconds it's easily OK. You should be fine up to 70C case temperature (mild ouch!), even 80C or 90C (mild curse!) on a blisteringly hot day. You will need to allow time for it to get up to a working temperature in an environment similar to where you want it to finally reside (maybe 10mins minimum).

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