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Wasn't me. I bought all the IV-17 VFD's 8-) The IV-9 is a nice part and is available from $1.00 to $1.50 each depending on quantity. Oddly, the current eBay listings have the price per tube go UP as

_http://en.wikipedia.org/wiki/Soviet_Union_ (http://en.wikipedia.org/wiki/Soviet_Union) Do you notice a difference between the ones with and without the CCCP stamp? Michail

[edited by A.J. - please trim quoted material] ----- From: NEONIXIE-L@... On Behalf Of michail1@... Your link to the album doesn't work for me. I have posted my findings. Basically, I

Hi: I'm shifting into CRT and dekatron mode now that I've bought too many Nixies. I put in an order for a CRT today with Sphere Research, and they told me that someone recently made off with their

Is there any problem with the link? I'm surprised there aren't lots of comments on IN-18 tube newness/darkening photos! It would be valuable to see some stats (and who the sellers were) on: 1. How

thanks entirely to THREE NEURONS designs and MR mikes new and wonderful hvps (get one soon)that will output all the voltages to run your dekatrons so let's go, pull them out of the drawers and lets

Direct inspection of the tubes doesn't reveal any peculiarities about the electrode edges. Since only micro, or even likely nanograms of material could produce darkening of the glass, I doubt eating

Just noticed your link changed in your post. It is supposed to be a T at the end, instead of a slash T. Major thing I just noticed..... All my tubes have always had the CCCP logo on the back. Your

Your link to the album doesn't work for me. I have posted my findings. Basically, I can't find a specific way to determine Used vs New. I can say I have tried to figure it out and I have thousands go

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Are there any differences on the edges of the numerals on clear and slightly darkened tubes? The pictures posted has not enough resolution to see if the edges looks newly cut or "corroded" from use.

Regarding the use of multiple bridge rectifiers. There can be a problem if one of the outputs is commoned eg negatives joined together and/or ground. It wires a diode in each bridge in parallel.

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I bought two batches, one f

Who designed the switchmode supply-- you or are you using someone else's pre-made board? Anyway, the intent of the question is that you don't necessarily need 16V to get 200V at high current. I was

...should have mentioned that I do have a tray of faulty ones should anyone want one for display or to have a go re-filling them... Nick

Depending on how much current your clock needs, you might find that your rectified and filtered output may sag down below 16 volts. I wouldn't be surprised to see it go right back down near to 12

It's an iterative process. You make a best guess at the start. The anode voltage (VN), usually ranges between 130V to 150V. Try 140V for starters. Calculate, and insert the tentative RA, in a test

This is a bit unfair. The ZM1350s that Jan sells are NOS - some do out-gas over time (as do all tubes, even Mullard/Philips/GE audio/RF tubes etc.), but Jan has the wonderful tester -