Anybody ever tried connecting both sections of the tube together and
using this device on HF instead of VHF? Its cheap and is good for 100W
max output with 1kV anode potential

Gonzo wrote:
Anybody ever tried connecting both sections of the tube together and
using this device on HF instead of VHF? Its cheap and is good for 100W
max output with 1kV anode potential


Yes, the Amperex 5894 tube (equivalent to the Mullard QQV06-40A)
was used in the Eldico SSB-100 series of 100W output HF transmitters,
which first appeared in 1956.

73,
Ed Knobloch

And, it is a modern version of the 829, a dual tetrode used in radar service
in WW II.

During the Korean war, the 4D32 that was used in the Viking I and a few
other rigs was grabbed up by the military and none were available for
civilian sale. So, the 829 was stuck in its place. I still have an 829 in
mine. Many came from the factory that way.

The 5894 is a good tube. Besides use in parallel for the rf, it can be used
as a modulator.

73, Colin K7FM

Thanks for the tip Ed. Have down loaded schematic for Eldico rig to see
how it was done. In Europe this tube was used in a Fish Phone rig
(2-4MHz) made by Salor Radio of Denmark. I know it can be done, but
with four tubes in parallel ? Best 73

Edward Knobloch wrote:
Gonzo wrote:
Anybody ever tried connecting both sections of the tube together and
using this device on HF instead of VHF? Its cheap and is good for 100W
max output with 1kV anode potential


Yes, the Amperex 5894 tube (equivalent to the Mullard QQV06-40A)
was used in the Eldico SSB-100 series of 100W output HF transmitters,
which first appeared in 1956.

73,
Ed Knobloch

Thanks for the info Colin.

Best 73

COLIN LAMB wrote:
And, it is a modern version of the 829, a dual tetrode used in radar service
in WW II.

During the Korean war, the 4D32 that was used in the Viking I and a few
other rigs was grabbed up by the military and none were available for
civilian sale. So, the 829 was stuck in its place. I still have an 829 in
mine. Many came from the factory that way.

The 5894 is a good tube. Besides use in parallel for the rf, it can be used
as a modulator.

73, Colin K7FM