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 Wanted 1 EM1 tuning valve
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 Return to top of page · Post #: 1 · Written at 6:11:47 PM on 20 August 2018.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1445

Hi guys . I am currently looking for one of these magic eyes. Any ideas where I might get one please.


 
 Return to top of page · Post #: 2 · Written at 9:15:43 PM on 20 August 2018.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 843

Depends what you want. Some are unobtainium. There are a variety on ebay.


 
 Return to top of page · Post #: 3 · Written at 12:06:44 PM on 21 August 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1345

EM1 is probably made of unobtainium.

You could change the socket to a UX type (or use push-on terminals and sleeving) and use a 6U5. At least you can still get them....

https://tubedepot.com/products?utf8=%E2%9C%93&keywords=6U5

6 pin UX sockets here:

https://www.ebay.com/itm/4pc-6Pin-Ceramic-Vaccuum-Tube-Socket-UX6-Base-Fr-W-E-310-366-42-US-Style-Bottom-/140884481903


 
 Return to top of page · Post #: 4 · Written at 4:01:01 PM on 21 August 2018.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 843

Sorry, somehow missed EM1 in the thread title.
I have some European eyes; will have a look and see if there is an EM1; probably used though.


 
 Return to top of page · Post #: 5 · Written at 6:40:31 PM on 21 August 2018.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1445

Hey Thanks STC830


 
 Return to top of page · Post #: 6 · Written at 11:01:16 PM on 21 August 2018.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 3860

6U5 needs -22V I think we need the other one with -7V or -8V on grid 6E5 That would involve a change from "P" base to UX6.


 
 Return to top of page · Post #: 7 · Written at 11:26:07 PM on 21 August 2018.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1445

I have actually found a NOS one. And I know it works as I have seen pictures of it being tested and the seller is very reputable.


 
 Return to top of page · Post #: 8 · Written at 5:00:21 PM on 22 August 2018.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 843

Have you decided to buy Tallar?


 
 Return to top of page · Post #: 9 · Written at 5:59:53 PM on 22 August 2018.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1445

Yeah I have matey. He offered it a few days back but didn't hear from him till yesterday. Did you find one ?


 
 Return to top of page · Post #: 10 · Written at 6:02:44 PM on 22 August 2018.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 843

Got the box down, haven't gone through it yet; will let you know.


 
 Return to top of page · Post #: 11 · Written at 8:48:01 AM on 23 August 2018.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 843

Afraid the valves in question are EM4s.

The pattern you can expect of your new EM1 is shown here:

http://www.magiceyetubes.com/patterns.htm

The substitutions page says that exact substitutes for the EM1 are:
4678, CV2942, ED78, ME6, ME6S, TK606, TV6, and U6-CAT

Tuning indicators are a fascinating subject as can be seen in the link.
The first indicators were meters and more cheaply made meter analogues. The first electronic indicator was the STC Tunograph:

https://www.radiomuseum.org/tubes/tube_tunograph.html

The first of the recognisable eyes was the 6E5, by RCA in 1935.


 
 Return to top of page · Post #: 12 · Written at 12:42:36 PM on 23 August 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1345

The EM4 should still fit and work with a few simple changes.


 
 Return to top of page · Post #: 13 · Written at 2:39:53 PM on 23 August 2018.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 843

Can supply the EM4 if you like Tallar. Should be able to send a base too.


 
 Return to top of page · Post #: 14 · Written at 4:12:54 PM on 23 August 2018.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 1345

When I checked, the base was the same. 8 pin side contact.

I suspect you may need to link a couple of pins. If you decide to go that way I can work it out for you.

AFAICS the EM4 can display two different variables using opposite beams rather than the cross-shaped eye of the EM1.


 
 Return to top of page · Post #: 15 · Written at 11:14:48 PM on 23 August 2018.
Tallar Carl's avatar
 Location: Latham, ACT
 Member since 21 February 2015
 Member #: 1705
 Postcount: 1445

I do have a New old stock one coming. Pretty stoked I was able to get one though.


 
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