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What are the most interesting vacuum tubes in your collection?

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radhoo

Mon Mar 28 2011, 10:29PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

It seems you've got the basic datasheet parameters, would be great if we could find an application or some functionality details.

Proud Mary

Mon Mar 28 2011, 10:35PM

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

radhoo wrote ...

It seems you've got the basic datasheet parameters, would be great if we could find an application or some functionality details.

Yes, it does seem a pity to have them and not use them for anything. I will think about it.

Afterthought: I've just measured the internal dimensions of the exit waveguide coupler, which shows that the device is intended to operate somewhere between 7.05GHz and 10GHz.

My frequency counter only goes up to 2.4GHz, but we can always fall back on Lecher wires to get a rough idea of the frequency - and of course very very much shorter than the parallel tuned line shown in this splendid engraving:

Dave47

Tue Mar 29 2011, 04:00PM

Registered Member #84 Joined: Thu Feb 09 2006, 01:06PM
Location: Dallas, TX
Posts: 47

Proud Mary wrote ...

radhoo wrote ...

It seems you've got the basic datasheet parameters, would be great if we could find an application or some functionality details.

Yes, it does seem a pity to have them and not use them for anything. I will think about it.

Electron Spin Resonance?

The nice thing about a klystron is that you can tune them electrically in addition to the manual tuning screw.

I used a spectrometer based on a magic tee in grad school. I was tasked with rebuilding the automatic frequency controller with solid state components in place of the 30 year old tube based AFC.

David

Proud Mary

Tue Mar 29 2011, 04:47PM

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

Dave47 wrote ...

Electron Spin Resonance?

Hi David,

I'd guess that my miniature klystrons were designed for use as local oscillators, and might have an output of 5 or 10mW on a good day.

Would that be enough for ESR?

Stella

radhoo

Tue Mar 29 2011, 05:07PM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

The datasheet for the 6236, shows 125mW output, and a frequency range of 3.8 to 7.6 GHz. There's also a circuit diagram here:

For an even lower frequency range, the 5837 operates between 550 to 3800MHz . Some details and schematic here (probably the simplest circuit):

. I have also attached the datasheet for this one. The 5837 tube I have is still in a good shape, with intact filament.

The RK707 seems to be an old model, a few basic details here:

. I do not have the datasheet for it.

Same for the RK-6037 no datasheet.

What frequency counter are you using, Stella?

]5837.pdf[/file]

Proud Mary

Tue Mar 29 2011, 05:20PM

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

radhoo wrote ...

What frequency counter are you using, Stella?

It's a Black Star Nova 2400 counter timer. Black Star Instruments was taken over by Thurlby Thandar a few years ago, so the Black Star brand has ceased to exist.

There's a spec sheet for the Nova 2400 here:

Dave47

Wed Mar 30 2011, 02:34AM

Registered Member #84 Joined: Thu Feb 09 2006, 01:06PM
Location: Dallas, TX
Posts: 47

Proud Mary wrote ...

Dave47 wrote ...

Electron Spin Resonance?

Hi David,

I'd guess that my miniature klystrons were designed for use as local oscillators, and might have an output of 5 or 10mW on a good day.

Would that be enough for ESR?

Stella

I used a Varian 2k25 which was rated at about 25mW from 8.5GHz to 10.2 GHz and was coupled to TE10 waveguide. 10mW is still probably enough since you can build the spectrometer to be like a microwave Wheatstone bridge (using a magic tee).

I have some really bad pictures in my thesis from 1995 (drawn in Word) diagramming the setup. But, maybe if we want to discuss ESR (what I remember of it, anyway) we need a new topic?

David

radiotech

Thu Apr 21 2011, 01:08AM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

Research Enterprises Limited REL 39B
CV 100
10E / CV100

The mesh is varnished on. Might be tropicalized WW2 radar rectifier. Two of the 3 clips on the base lead up to the stempress, one is sleeved in a glass tube leading ? Wire guage is small ~~ 22?

magnet18

Thu Apr 21 2011, 01:17AM

Registered Member #3766 Joined: Sun Mar 20 2011, 05:39AM
Location:

Posts: 624

Wow, My most impressive tube is the IN-14 nixie

Other than that I just have some simple radio tubes I bought s replacements but apparently didn't need.
Hoping to nab some dekatrons sometime soon though...

[EDIT]
Don't worry, I fixed the over-current problem from the video.

radhoo

Sat Aug 06 2011, 09:33AM

Registered Member #1938 Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701

TGI2-400/16 Hydrogen Thyratron , Supporting up to 400A 16KV pulses,

Datasheet attached. I will use it for a relaxation oscillator.
]thyratron_tgi2.pdf[/file]

The picture shows it close to a DY86 vacuum rectifier for size comparison.

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