Unknown sub assembly.

[Till Eulenspiegel]

Bought this strange piece of equipment yesterday on Ebay. It was only £3.99 so I though it was worth buying, just for the multi-plug and socket alone.

Any ideas what it is?

Till Eulenspiegel.

[bassoonbloke]

Hi Till,

Interestingly I was watching that, it just looked 'Interesting'. I couldn't make out what the tubes opposite the valves were, I assumed that they were a set of coils.
Should be easy to put 6.3v for heater and a bit of HT and see what it might do !!
I have no idea what it came from though. Googling a few numbers on the chassis might come up trumps.
Oh well, something to mess around with......

Cheers,
Alan.

[Till Eulenspiegel]

Hi Alan,
It's certainly not a piece of civilian equipment, I'd reckon it's from military communications gear. As soon as it arrives I'll set about tracing the circuit. You never know there might be some useful task for for it to do.

More pictures.

Till Eulenspiegel.

[turretslug]

Disc-seal triodes in the "chimneys? Looks like annular contact fingers inside, BNCs on the outside for in/out coupling. Something UHF-ish, maybe a mixer head?

[GlowingAnode]

Disc-seal triodes in the "chimneys?

2C39A's by the look of it. 18 W @ 3,000 MHz.
Could be a high level mixer or distributed amplifier.

Rob.

[Till Eulenspiegel]

Read about the development of high frequency tubes including the 2C39 in fig 5.6 here: http://www.ase-museoedelpro.org/Museo_E ... quency.pdf

Till Eulenspiegel.

[davegsm82]

Did you ever work out what it is till?

Dave.

[Till Eulenspiegel]

Hi Dave, It arrived last week. When I return to the shop later today I'll unpack it and let you know about my findings.

Till Eulenspiegel.

[Till Eulenspiegel]

Last night I finally got around to unpacking the unit. Here are my findings: The disc seal triodes are missing. The three valves present in the unit are; an RCA 6J4 UHF triode, an M8100 VHF pentode, similar to the 6AK5 and EF95 and a Ratheon CK5670 double triode. The whole assembly is constructed on a 7" X 5 1/4" plate. It's unlikely there is any practical use for this unit, however, I'm sure there are many useful spares to be gained from it.

Details of the valves: http://www.radiomuseum.org/tubes/tube_6j4.html http://www.radiomuseum.org/tubes/tube_m8100.html http://www.radiomuseum.org/tubes/tube_ck5670.html

Till Eulenspiegel.

[Till Eulenspiegel]

Another version of the CK5670 twin triode: http://www.radiomuseum.org/tubes/tube_ck5670-wa.html

Till Eulenspiegel.