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RE: Heathkit IG-18 mods 2008?

Posted by ironbut (A) on December 21, 2008 at 13:28:25

In Reply to: RE: Heathkit IG-18 mods 2008? posted by PhilH on December 21, 2008 at 12:57:01:

Thanks Phil, here's the info related to the 40408;
The added circuit is a simple emitter follower.The transistor I used isn't too critical, so long as it has a Vceo greater than 45.
Regarding the 2n5687;
I increased the current gain of Q3 by converting it into a compound pair/adding another transistor.It should be a high hfe, low noise device with a Vceo of not less than 45V and must be a pnp.

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