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What are the most interesting vacuum tubes in your collection?

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Proud Mary

Wed Feb 08 2012, 07:18PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

PMT FeU-29

This handy photomultiplier has 13 dynodes, and the two radial terminals are cathode and anode. The base is a Russian 14-pin with central spigot.

Spectral sensitivity is in the range 300 - 600nm, with peak sensitvity lying through 380 - 420nm - across the UV to violet transition.

Gain increases with anode voltage, being a modest 1*10E5 at 860 V, rising to a sensitive 1*10E7 at 1.360 kV.

Proud Mary

Fri Feb 24 2012, 01:20PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

GS4V Microwave Triode 15W 7.5 GHz

1330088168 543 FT0 Gs4v Microwave Triode C

This tiny ceramic triode is 31mm from tip to tip and weighs just 12 gm, but can deliver 15W at up to 7.5 GHz in Class C oscillator/amplifier applications using co-axial resonators.

Heater voltage is 6.3V, typical anode voltage is 200V, and mutual conductance is 15 - 18 mA/V.

Cooling is forced air.

Verdict: an astonishing little device! A must have for the recreational plumber!

Proud Mary

Fri Feb 24 2012, 06:31PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

6S9D UHF Triode 5.5W 900 Mhz

1330107426 543 FT0 6sd9 Uhf Lighthouse Valve Upload 4hv

This gorgeous Russian triode can deliver up to 5.5W at 900 MHz, in Class C oscillator/amplifier applications, with co-axial resonators.

Heater voltage is 6.3V with 'typical' anode voltage 250V at 15mA Â± 7mA.

The base is international octal, weight is 40 gm, and guaranteed minimum service life is 600 hr.

Another must have for people who enjoy the copper pipe and brazing torch approach to tuned circuits.

Proud Mary

Sat Feb 25 2012, 10:15PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

3C24 RF Power Triode

This remarkably compact relic of the Second World War can output 100W of RF as Class 'C' oscillator/amplifier with 2kV on the anode.

Unsurprisingly for a valve that dissipates 25W at the anode, but is only 111 mm high, the datasheet advises that "Heat dissipating connections of large area are necessary for anode and grid."

The UK military designation for 3C24 is CV789, together with CV2736 where they are supplied in matched pairs. One can easily imagine them huffing and puffing, backwards and forwards with the electron stream when two are working in push-pull.

Heater is 6.3V/3A and the base is Small UX4.

Dr. Dark Current

Thu Mar 01 2012, 01:19PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Here's my tube collection of now, needed to take them out of my room as it's a real mess

Proud Mary

Tue Mar 06 2012, 07:25PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

V2V-1V Vacuum Relay 4kV 15A
(B2B-1B in Russian Cyrillic characters)

The gap between the armature plate and the face of the solenoid in the base snaps shut when 12 VDC is applied to the two base pins

Top view showing internal relay contacts. The moving contacts are operated by a simple lever connected to the armature plate.

This unit came from an original unopened box dated May 1991, so the sputter deposits seen around the right hand contact can only have come from
quality control testing or burning-in at the Russian factory.

Conundrum

Wed Mar 07 2012, 10:51PM

Registered Member #96 Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4061

LOL! "In Soviet Russia, tube burns you in!! "

Still can't figure out a use for the 30 or so mercury wetted vacuum relays I found in a random box of parts.

-A

Proud Mary

Thu Mar 08 2012, 01:36AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Mercury-Argon Thyratron 393A
British military No. CV 2638

Argon is used in this design to initiate a plasma discharge at a lower temperature than would be possible using mercury alone. Once running, it behaves as a mercury vapour device, with the usual 10V voltage drop across it.

The speckles of black and silver on the inside of the glass are condensed mercury.

The gauze holder of the mercury heater seen in profile in the top picture is shown in detail below.

1331169720 543 FT0 Thyratron 393a Heater B

This is a slow old negative-control thyratron - de-ionisation time is a leisurely 60 Î¼s at best - but its charm lies in the hand built nuts-and-bolts construction inside the glass envelope.

Maximum anode voltage is 1200V at 6A peak, grid voltage is down to -500V, and the heater is 2.5V/7A.
Mounting must be vertical to accomodate the condensed mercury, and the base is International Octal.

Proud Mary

Thu Mar 08 2012, 05:26PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

DL73 miniature VHF directly heated power pentode

This terrific little battery pentode was designed for use in "communications equipment of the 'push to talk' type" - in a word, early military walkie-talkies.

1331226625 543 FT0 Dl73 Pentode Cropped And Labelled

Power requirements are 150V/18mA anode, -20V grid bias, and 1.25V/200mA filament.

Output is 1.6W at 50MHz falling to 1.2W at 200MHz as Class "C" power amp.

Great stuff for a valve no thicker than a pencil, but operating life in push to talk service is short: just 200 hours.

LuceÅ¡

Sat Mar 10 2012, 02:32AM

Registered Member #4108 Joined: Sun Sept 25 2011, 11:43PM
Location:
Posts: 149

Dr. Dark Current wrote ...

Here's my tube collection of now, needed to take them out of my room as it's a real mess

what about your gu-80? that is probably one of your most rare tubes!

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