[GreenKeys] Flesher TU-170 Loop Key Transistor

[Bob kb8tq]

Hi

A pair of NE-2 neon bulbs in series across the “load" used to make a pretty good “fix” 
for the problem.  They also gave you a nice visual indication of activity on the circuit ….

Bob

> On Oct 30, 2020, at 11:20 PM, Harold Hallikainen <harold at mai.hallikainen.org> wrote:
> 
> 
> I'm looking at the manual for the TU-170 and see that it keys the loop
> with an MJE340 which has a maximum Vce of 300 V. 152950 loop supply has a
> loaded output voltage of 125 V. Can the MJE340 take the inductive spike
> when it opens the loop, or should a clamp be added?
> 
> Thanks!
> 
> Harold
> 
> 
> 
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