[Milsurplus] [ARC5] Hello Smart People Again:

[Richard Brunner]

Transistor vibrator replacement:
I have used a simple version of this circuit many times which works
without fail, usually when I have tried to restore a vibrator and have
damaged it beyond help.  Two 2N3055 type transistors with collectors
connected to the ends of the LV transformer winding, two 5000 Ohm
resistors connected base to opposite collector, emitters grounded, + LV
to the transformer center tap.  The other parts in the referred diagram
are superfluous.  Buffer capacitors installed in the power supplies may
contribute to stability, for example in the DY-105 there is a .047
across the primary, and .008's across each half of the HV winding.  The
base drive resistors are not critical, and a little experimenting is in
order - if too large it won't start, and if too low the transistors are
driven hard.  This circuit is slightly more efficient than a vibrator.

Richard, AA1P