"kontiki" wrote in message
...
I noticed an 829B tube in the final which was commonly used for
VHF frequencies of that era in a push-pull configuration. It may
be an early FM broadcast transmitter (88 - 108 Mhz), but I doubt it
because it appears to have a modulator (which an FM transmitter would
not have).

If it is VHF it could be an ILS or localizer transmitter.