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Dr ZEE 19th July 2007 09:00 PM

EMC Model 200 Tube Tester Any Info Pls
2 Attachment(s)
Hello all good ppl!
I've almost finished electronically restoring this old EMC 200 (transconductance) tube tester. Will work of enclosure woodwork later.
The problem I have here is that I am having hard time trying to locate any instructional material on this unit. I kind of can figure out some action on how to use it based on my previous experience but it is pretty hard guessing work and it would help a lot if I could find any material on this machine.
If anybody could give me a lead or a tip It would be greatly appreciated.
Maybe there's some spot on the internet that is hidden from searches or something? I almost gave up trying to find any material.
Thanks in advance
I am attaching a photo of the tester on my bench:

kevinkr 19th July 2007 10:01 PM

Bama doesn't have a manual for the 200, but has manuals for several other models. Perhaps there is something useful in them:

Dr ZEE 19th July 2007 10:14 PM

Couple notes here.
First of all SORRY for double post here. I though somthing went wrong when posting the thread. Had no idea about "under moderation" period. :o
also, I have found info about 205 model, which is similar unit but 'emission type'. It gives me some starting point ideas on how to use 200.
found here:

Dr ZEE 19th July 2007 10:14 PM

Kevin, thanks a ton for trying to help. Yeah, I had been at bama and got those too. Actually I have this mirror page: , as I get "not found" all the time at

ethermion 19th July 2007 10:39 PM

The 211 & 213 at bama are from the 1960s. Your 200 is 1946. Probably not much help in those manuals.

Might try some of the vintage radio forums, or track down a copy from one of the online dealers.

Dr ZEE 20th July 2007 01:05 AM


Originally posted by ethermion
The 211 & 213 at bama are from the 1960s. Your 200 is 1946. Probably not much help in those manuals.

Might try some of the vintage radio forums, or track down a copy from one of the online dealers.

Yep. I went through those. 205 unit is as close as it gets I guess. I thoguht it would be somewhat easier to figure the unit out without manual, but not so. It's a puzzle

Try and see what's gonna happen is not a good idea in this situation. I'll keep trying to find something. I have not seen that manual anywhere for sale either. :( I may end up to completely reverse-engineering the unit ...:eek: :xeye: hope not

kevinkr 20th July 2007 04:36 PM

Hi Dr. Zee,
One thought that comes to mind is that all of the settings required to use the tester (at least for the types then available) should be in the roll chart.

If you can post a good picture of the entire chart showing a type listing we might be able to decipher how to set up the tester to actually test tubes. Worst case just type the entries from an entire row..

I have the manuals for my Hickok, but have hardly ever had to refer to them - the charts should be fairly intuitive once you are familiar with them. (Now the Hickok charts might have been better than the EMC charts, but I'll bet there is not that much difference.)

Dr ZEE 20th July 2007 10:19 PM

Kevin, thanks a bunch again.
I've made some extra photos. Am posting them in the following posts.
Any thought or an idea would be a help. As I kind of figured that it is not going to be a simple tast to simply "reverse engineer" this thing. It may not look like a big deal, but actually to try to catch the principle(s) behind this unit with no leads is pretty damn challenging, well, for me anyway.
I've done pretty much everything that looked like had to be done as bringing this unit to life. Replaced couple resistors, caps, cleand all the switched and pots in and out etc. I've powered it up. Got to the point of setting the L.V. level. All looks and smells good :). But this is it. I have not tried yet to actually insert a tube, because I don't want to get in trouble before I get some idea about what I am doing.
My current guess is , that all the switches should be in "K" position. Then you start settings from there, but the order of actions and what I should and should not switch etc ... all bunch of unknowns for me.
OK, here we go with photos.

Dr ZEE 20th July 2007 10:20 PM

2 Attachment(s)
here's left side (6L6 there as example)

Dr ZEE 20th July 2007 10:23 PM

2 Attachment(s)
here's right side with 12ASX7
"S" infront of the tube type means that the "N/S" switch should be in "S" position for this type of tube

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