Mesa Throttle Box

The only problem (in my opinion) is inductor. Not very popular value, not easily available. But it's possible to replace inductor with op amp gyrator.

T.
 
You mean replacing 250mH with 250uH? According to the ltspice simulation 250uH inductor equals to no inductor.

From left ro right - 500mH, 250mH, 100mH, 50mH, and three overlapping traces - 1mH, 250uH, inductor shorted.

1579639075187.png
 
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I think you'd be effectively disabling that control by using 250uH, that would increase the cutoff frequency by a factor of 1000.
 
You should hear a difference using 50mH inductor, and that's only 1/5 of the required value. Of course you need "proper" inductor to hear the difference :)
 
Easier to dial in with genuine transistors. So rather stay away from to92 package J201's.

T.
 
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