Echo Communications "Range King" uses two 6JG6 tubes in GG mode at 850VDC and 6BQ5 keyer.
Covers 25-40MHz.
Input power 120VAC.
Safe output rating: 17W AM, 68W average, 80W PEP SSB.
(Note: Due to the peculiar HV keying arrangement, these have a nasty failure mode of putting a momentary 350V spike on the input coaxial line from the transmitter when the keyer releases. Although it might not damage a tube tranceiver it can fry a solid state one.)
not for sale. not for use on CB band. for educational display only.
I thank a corresponent for writing:
"I have the mobile version. Transistors in question are Delco 2N1522. In this model there is no tube used for the key circuit. The unit looks exactly like the Range King, but Manufactured by a company called Biggs Electronics Inc. Peru Illinois. I believe that it was built by one company and than relabeled at points of sale."
The frequency range of the amplifier is shown to be wide, but in order to achieve this range efficiently, it is necessary to tap the PI-network coil. It can be put on 6M, but efficiency will suffer and the RF current pilot lamp coil should be reduced to 2 turns.