开云体育

Replacement of nuvistors with JFET's (specifically, MPF102 JFETs) in the
422 scope vertical amplifiers has been accomplished by "Kurt" and was
documented several years ago in his blog. I believe this is also
described at www.w140.com, under the "422" scope webpage. However, the
plate voltage in the 422 scopes is about +25 volts. The plate voltage
of the nuvistors in the vertical preamps of the 453 scopes (early S/N's)
is about +75 volts, so I suspect this would likely zap a MPF102. There
might be other JFETs that have adequate drain-to-source voltage rating
to serve as replacement for the nuvistors in the 453 (early S/N) scopes.

Mike Dinolfo N4MWP