In Soviet Russia, they had warehouses full of capacitors...

Night vision gear! Hydrogen thyratrons!

Sorry stupid question; Is the 15nF in series or is it to ground? So the later would make good power supply feed throughs for an RF circuit. I think we pay a few buck each for those from Newark.

We get glass work filled with Rb from Russia... but not much call for that.

And also some old RF power transistors.

George H.

Sorry stupid question; Is the 15nF in series or is it to ground? So the later would make good power supply feed throughs for an RF circuit. I think we pay a few buck each for those from Newark.

We get glass work filled with Rb from Russia... but not much call for that.

And also some old RF power transistors.

George H.

Tunnel diodes, both Ge and GaAs types. About half of them work.

PMTs.

Moran double oven OCXOs that seem very good except QA is somewhat poor.

They're feedthroughs, i.e. the capacitance is to ground and is fully coaxial. They work _great_. The guy is asking $45 plus shipping for

The other nice thing is that the ferrules are tin-plated brass, so they solder really well. I put them in slightly counterbored holes in die-cast aluminum boxes, with the board mounted inside the lid, so I can solder the feedthrough to the ground plane, like this:

I've never actually seen a hydrogen thyratron--gotta get in touch with my inner Oz.

Cheers

Phil Hobbs

Yes, nuvistors. They must have hoarded those because for years they have been showing up by the egg carton:

Then you'd be prepared for situations where you need a really hi-Z input and protection diodes aren't an option for some reason. If you are really lucky you might get a complete carton with CCCP on there :-)

I only know the American nuvistors from personal experience. Here is a typical datasheet, and Soviet ones were AFAIR mostly copies of the American products, like usual:

Amazing, even back in 1962 they had the occasional text blurb such as the trademark hint in English and Spanish. I remember nuvistors that would work quite well with less than 50V plate voltage. Some are even happy with 20V. But of course they do require the filament to glow, so no Energy Star rating there. Their noise performance at RF (in my case all >100MHz) is stunning, considering their vintage.

Ooooh, Soviet feed-thru caps installed in apparatsky Amerikansky. Lenin would have a hissy fit.

Which material are those gray strain relief splotches at the bottom?

Ooooh, Soviet feed-thru caps installed in apparatsky Amerikansky. Lenin would have a hissy fit.

Which material are those gray strain relief splotches at the bottom?

JB Weld steel-filled 5-minute epoxy, which is great stuff. (The Peltiers are silver-epoxied down, so epoxying the leads isn't much more daring.)

Cheers

Phil Hobbs

We use these, very nice, small, cheap:

Those do look nice. NPO, I assume?

Cheers

Phil

I have an RCA 6DS4 Nuvistor right here in my desk drawer. ...Jim Thompson

Hmm not much of a data sheet. How do they work? Are they the squezzed mica sheet type thing? Or is it something else. We use these nice tubular tuning caps, but spendy.

George H.

.highlandtechnology.com  jlarkin at highlandtechnology dot com

They make a nice switch in a nitrogen laser, among other things. I spent

Can't recall. The low values probably are. Higher value ceramic variable caps certainly aren't.

We use the Maxim (!!!) Flecap too. It's a programmable silicon capacitor.

They are ceramic, half-circles sliding past one another or something. I should take one apart some day.

Sapphire piston caps are great, except for the spendy bit. They come nonmagnetic (seriously! nonmagnetic) for NMR use.

I have some used 13DS4 and some NOS 6CW4

for

ly,

mm

nts

ide

We make our own from some expensive high Er pcb material and use a stepper motor to control it

a bit similar to this:

yep, very expensive and quite fragile

-Lasse

Fun. Some high power RF thing?

GR used to make an oscillator that used a combination variable capacitor and variable inductor all in one chunk. Forget what they called it.