New member from Sacramento.

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New member from Sacramento.

Post by Ubernoob51 on Mon Oct 31, 2016 5:15 am

Hello. I'm new here, I've got a piece of tube equipment I'd like to repair, but first, about me.

My name's Alex, I like old cars and cool old stuff in general. I'm not very experienced when it comes to electronics repair, unfortunately. I can solder, and have put together simple electronics for my homemade guitars, but that's about it.

Any way, I have a '50s vintage Detectron DG-7 Geiger counter I'd like to get working. It's all tubes, and uses point-to-point wiring. It's SUPER clean on the inside, I think my biggest problems are gonna be: replacing all the capacitors, finding a GM tube (the original Victoreen tube has imploded), and getting batteries.
You can't exactly go down to the local radio shop to pick up a couple of Eveready 455s these days.

I have had no luck uploading pictures Sad

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Re: New member from Sacramento.

Post by 75X11 on Mon Oct 31, 2016 9:17 am

Welcome!  I wrote a tutorial for uploading pictures.  It helps to resize the pictures to 700 to 800 pixels at the largest dimension, then It doesn't take as long for the host's resizer to do it's stuff.  read the section at the end to see the most recent changes to the procedure.

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Re: New member from Sacramento.

Post by Guest on Mon Oct 31, 2016 9:57 am

Alex, welcome to TRF! Very Happy

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Re: New member from Sacramento.

Post by Bill Cahill on Mon Oct 31, 2016 12:22 pm

Welcome to TRF Alex... Glad to have you here............

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Re: New member from Sacramento.

Post by Conelrad on Mon Oct 31, 2016 12:31 pm

Electronic Goldmine has Geiger tubes for sale at times.

Dennis

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Re: New member from Sacramento.

Post by Ubernoob51 on Mon Oct 31, 2016 1:52 pm

I've got an iPhone, so I'm still learning to navigate the site.


Last edited by Ubernoob51 on Mon Oct 31, 2016 2:05 pm; edited 1 time in total

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Re: New member from Sacramento.

Post by Ubernoob51 on Mon Oct 31, 2016 2:04 pm

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Success!!!!

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Re: New member from Sacramento.

Post by 75X11 on Mon Oct 31, 2016 2:14 pm

You are probably going to have to make up a battery for it.  The sources for the old plate batteries have about dried up.  Usually a multiple of 9v transistor batteries can be assembled into something acceptable. There are a few sellers on Ebay that make connectors that can use a multiple of 9's and has a nice box with a period label to look like the original. They have the larger snaps to connect to your unit.
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Re: New member from Sacramento.

Post by Ubernoob51 on Mon Oct 31, 2016 2:19 pm

I will need 10 (10!) of them, this thing originally took 2 45v B batteries.

The transformer inside stepped this up, to !!900!! volts, apparently that's what it took to make the Geiger tube work.

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Re: New member from Sacramento.

Post by 75X11 on Mon Oct 31, 2016 2:25 pm

I would suggest Lowes, Home Depot or Big lots. One good thing is that the 9s usually don't leak. Another is that you should have enough room for them.
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Re: New member from Sacramento.

Post by Wildcat445 on Tue Nov 01, 2016 10:40 pm

Welcome to TRF!

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Re: New member from Sacramento.

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