A receiver preamp that straps :)

[WQ9E]

For those of you trying to avoid getting an energy star rated shack, this is the VHF preamp for you!  It probably draws around 300 watts total between filaments, fan, B+ needs, transformer loss, etc.

[Bill, KD0HG]

For a long time I've had a project in mind, a regen receiver using an 833-A.
Maybe, finally this winter.

I did once build a GG preamp for FM broadcast using a WE 416 I got out of some surplus C-Band telephone gear, it worked great, yeah, prolly pulled 50 watts.

Thanks for the posting.

[WB2EMS]

Reminds me of when I worked for a company that built some of the hardware for the LAMPS anti-submarine warfare system. The sonobouy receivers festooned on the P3 Orion's had a pretty rough RF environment to work in. To operate without being driven non-linear by nearby transmitters they had a 2N3866 transistor, more commonly used as a final amp in 2 meter HT's, as the first RF preamp. It had about 150 ma of standing current running through it, and a heat sink as I recall. Not as hairy as a 2C39, but still pretty stout.

[Opcom]

I like it, good front end protection too.

[KM1H]

He must have run that into a SCR-522, any other radio would have blown its input stage.

And dont try it ahead of any SS.

[WQ9E]

For a long time I've had a project in mind, a regen receiver using an 833-A.
Maybe, finally this winter.

Bill, 

I look forward to seeing results and photos from that project.

Are you going to write an ER article on choosing the best transmitting tube for a regen? 

[vincent]

About the use of the 2C39A tube also as a low noise receiver amplifier.
The Boonton 230A (later HP230B) uses 3 of these tubes.

[k4kyv]

In the early days of VFOs, right before WW2, some people tried using transmitting tubes like the 211 as the oscillator tube.  The idea was that a transmitting tube had so much dissipation rating relative to the power of the oscillator circuit, that when running as a low powered oscillator (real VFO, not a one-tube self excited oscillator transmitter), the tube's temperature would not change significantly.

I suspect the results were disappointing, since after the initial warm-up most VFO drift results from rf heating the coil and capacitors in the tuned circuit, not from rising tube temperature. The normal warm-up of a 211 would likely cause much more drift than that of a 6C4.

Solid state VFOs tend to be more stable mainly because the oscillator usually runs at a lower power level than that of a tube type oscillator.

[Opcom]

About the use of the 2C39A tube also as a low noise receiver amplifier.
The Boonton 230A (later HP230B) uses 3 of these tubes.

I had one of those. The one I had called for a special version tube with a smaller anode radiator.