3 Valve S/Het with Xtal Filter

[Skywave]

For those who may be interested:
Cct. is as per the A.R.R.L. Handbook, 41st. edition, 1964: p.116 - p.119.
An earlier version is in the same publication, 36th. edition 1959: p.119 - p.123.

Al. / Skywave.