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Testing done on the first of these, haven't found the 4 wire/2 wire one yet, but hey, I cleaned up my bench over the weekend, I can't find anything! ENi transformer on the Octopus transformer tester-

Chapter 2:? The Leaning Curve Initially the plan was to gobble up one or 2 examples of each version of the CDV-700 as well as many different vintage commercial Geiger counters, and their manuals,

Chapter 1) Hard to believe 20 years went by since the US Gov't started scrapping CDV-700s. A few passed through my shop. Most were ENi's (Electro Neutronics inc." the last versions, CDV-700 6B. built

Nice work, Geo! I thought of making a similar test jig myself but time is a rare commodity these days. Well done! AlanJ

the 3 wire each side was the original on the ENi. the transformer on the board with the multicolored wires I got from Lenox 2 years ago. the other transformer 4 wires one side 2 the other, bought off

Where did those come from Michael? You mentioned before but I forgot. Geo To: "CDV700CLUB" <[email protected]> Sent: Monday, May 23, 2022 10:28:12 PM Subject: Re: [CDV700CLUB] CDV-700 Transformer

hey George, that is cool.? ?Glad the transformer is working.? Actually helps me knowing that - hone my trouble shooting skills and focus more on the other parts of the circuit.? ?and I want to

Hi Geo, This is an interesting coincidence you bring this up at this time. I was using my cheap Mulitifunction tester-TC1 (available for less than $20 with free shipping on eBay) to test some

This evening's project added the next important tester I call the "Octopus" (see if you can figure out why?) It's a straight clone of the ENi on my version of perfboard. There are 6 wires with clips

It’s line powered. It’s in decent shape, I am going to have to open it up and take a look. Clay Sent: Monday, May 23, 2022 7:02 PM To: CDV700CLUB Subject: Re: [CDV700CLUB] CDV-700 Transformer

That looks like a real winner Clay! What is the battery compliment inside or does it have AC power, fporgot to look? I just finished building a transformer tester with a Russian transistor, and it

Does anyone here have a manual for a Lectrotech Model TT-250 In-Circuit Transistor Analyzer? I have one that seems to have issues, and do not understand how it is supposed to be used. I have had no

geo i have the same heathkit tr checker it just a different colour. i got mine for $1 at ham club swap meet. i also have a radio shack tr tester that uses the transistor in an oscillator to light a

All transistor electronics in the late 50's and early 60's available to the general public, used germanium PNP transistor with rare exception. We didn't even have silicon rectifiers until much later

Top row, left to right Battery current meter- 2 ranges 0-50mA and 0-500mA. Eni CDV-700 draws about 55mA, a single 100 or 200mA would be fine. Bare, transformerless, Eni CDV-700 PCB, updated with

Perfect logic! Always start with working ENi original, make cautious repairs before doing actual circuit changes, the LENi conversion. You're right about the need for a working board before making

Geo -? okay no battery tray in box. and by the way - this is still an ENI board, I have not started a LENi conversion on it. I wanted to confirm original functionality first.? I figured if it was

hi Lenox, yes all parts are new including that cap.

Keep the battery box, I have one. It will come in handy for you as a test tool in the future. George To: "CDV700CLUB" <[email protected]> Sent: Tuesday, May 17, 2022 10:36:12 AM Subject: Re:

That’s interesting. The colors on the schematic that I sent worked for me. I agree with Geo that there is something strange going on with that board. I ended up replacing the high-voltage filter