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From: "GlowFrog" <jeffburris@...>
To: [email protected]
Sent: Friday, August 20, 2021 12:33:06 AM
Subject: Re: [Alpha-Beta-Gamma-Society] CD V-700 max capacity with a pancake?

Thanks Geo, and I feel your pain of lesser serviceable things today... well, thanks first of all for the heads up regarding the thick window of the SI-8B. I thought it was closer to being an equivalent in performance to an LND like you'd see in a Ludlum 44-9 probe.?
Since it's not, in respect to alphas, I think I won't go that route.
Unless there is a cheaper alternative like some Soviet surplus that is rather like the LND 7317 or LND 7311 or something, then it looks like I need to try to either get a pancake probe with the real deal or get ahold of one and fashion my own.

My objective is to be able to get approximately similar readings as other people with these popular probes and/or tubes in the back of modern $325 one-piece handheld counters like the GMC-600, so I might test my rocks and put them up for sale with an idea of what someone else will read.
I mean, I can always multiply my end window reading x5 which seems rather consistent for uranium specifically, but...

So two things that would help best would be:
1) anything I could use to know to build my own probe out of an LND tube (I don't really know the specs differences between the 7311, 7313, and 7317, or which is actually in a Ludlum 44-9, I just know it's "Ludlum OEM replacement part?01-5008)
2) any leads on the best price on an LND pancake tube... because for what they cost from Ludlum I periodically see a ready to go probe that was previously purchsed but shelved and never even used.
3) Especially anything on increasing the overall max capacity of the unit, like perhaps the x2 proceedure you mentioned! That's just what the Dr. ordered if I either get or make a pancake. I took that to mean a mod (with or without a new toggle switch?), unless you meant more just that the new calibration proceedure would simply lend itself to readings that were really 2x what the gauge says. Either way. I just know a pancake will peg the needle too often without such a mod.

I do not yet have the slick GeoElectronics calibration box (pulse generator?) ... I do have Dr. Buggie's po boy calibration kit consisting of 6 pounds of rocks labeled with hot spots and values throughout low, medium, anfd high activity... 3K CPM thru 67K CPM?(as measured with a Bicron probe with a LND 7311 pancake on some fancy digital Ludlum meter), and duplicates of many values for consensus). So it's intended for helping with hobby, ballpark calibration (or at least the tweaking of little variable pots to one's satisfaction).

I supposed there is this LENi approach, as well, of which I know very little but pictures. I suppose in this case one fits a pancake inside the chassis?

Adding sound with the nice pcb you have is attractive. I don't know where any plans are for that... probably fairly simple but for one thing I am not sure what value or range of variable resistor to provide. I have lots of little speakers. I tried hooking a piezo transduce squealer up directly to existing the output and it was surprizingly audible. I would have thought the screw-on connector was the same between my Lionel CD V-700 and my so very similar (outwardly identical except for color) Victoreen 493. But the threads are different, LOL! The oldschool-to-1/8" jack adapter the physicist sent me with the Victoreen just isn't having the threads on the V-700. Either it's different or he cross threaded and sort of retapped the coupling.

And just downright knowing my options for these historical, resillient, yellow beauties in case I want to procure one or two more V-700's and do something different with each.
Data on refurbing and going solid state with the recitifier or HV sections.

If you still have zip files, heck I'd store and read the whole historical archive, eventually.
And with the new website going up I'd be happy to put up a section. I could do it on the new "wonders" site instead of the church one if it might alienate or falsely represent anyone.
It will surely be up soon and surely be permanent (just like the church one since 2016) because it will be tied to my living no matter which way it bobs and weaves.
I expect to be designing these woodwinds and talking software and theory etc. indefinitely. Just have been finishing making the products availbale first, which was 10 months of alpha, beta, and now unveling. Well, I've sent my prototype flute considered finished to my most tireless mentor and vet in the field, and if it gets the thumbs up I'll offer flutes to the public and swiftly finish an amiable website with items of interest both for prospective customers of my woodwinds as well as DIY'ers just wanting to make their own or maybe get help with acoustics software, with some articles.

Radio inevitably edges its way into my content just as it does the ministry so geigers would nestle right in there if you're open to the historical archives being described and available (and you're welcome to back end Wordpress access, Geo).
Heck if it started drawing bandwidth (like it seems it did at QSL, or was it just space) then I'd happily just up my server subscription because it would be good for my SEO.

Thanks for anything you take time to make available!
I can tell you I've gotten a couple of other people interested as well and I think it's a shame for any V-700 to go to waste when there's some geek out there that just hasn't been turned on about them yet.?
I've never had more fun for a hundred or two dollars at a time!