Dynatuner FM-1 Restoration - diyAudio
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Old 29th January 2011, 07:26 PM   #1
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Default Dynatuner FM-1 Restoration

I am in the process of restoring a Dynatuner FM-1 with the Multiplexing board for stereo operation,and I am going to re-tube it because I bought it without the tubes,and was wondering since the Magic Eye tube, that is required for calibration,is hard to find and expensive,is there a way to build a SS replacement for this tube,maybe using a couple of LED's or such,and other components to basically perform the same operation? Thanks in advanced.
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Old 29th January 2011, 08:35 PM   #2
M Gregg is offline M Gregg  United Kingdom
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Hi,

You haven't told us what the number of the "magic eye" tube is?

If it is as hard to find as you say why don't you just rewire the socket and use a different type?


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Old 29th January 2011, 09:38 PM   #3
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Quote:
If it is as hard to find as you say why don't you just rewire the socket and use a different type?
That may be easier said than done. Look here for an article pertaining to the FM3, which is (more or less) a FM1 whose MPX is built in.

RES shows a $70 price for the EMM801. Whether or not they have stock is TBD.
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Old 30th January 2011, 05:45 AM   #4
jfitz57 is offline jfitz57  United States
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Hi.

What are the tubes that you need? I've got tubes from a couple '60's stereos and one of them is a tuning eye tube.
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Old 30th January 2011, 10:39 AM   #5
Gilgy is offline Gilgy  United Kingdom
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Google says this unit uses an EM84 tube, ebay's teeming with them!
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Old 30th January 2011, 01:03 PM   #6
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Gilgy is correct. Unlike the FM3, the FM1 uses a 6FG6/EM84 as the tuning eye. A PDF of the complete FM1 manual, including schematic, can be found here.
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Old 30th January 2011, 05:11 PM   #7
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Quote:
Originally Posted by M Gregg View Post
Hi,

You haven't told us what the number of the "magic eye" tube is?

If it is as hard to find as you say why don't you just rewire the socket and use a different type?


Regards
M. Gregg
I apologize, it is the EMM801,I have heard you could rewire it for use of the EM-84 tube,but does this yield accurate results?
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Old 30th January 2011, 07:06 PM   #8
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Originally Posted by denny9167 View Post
I apologize, it is the EMM801,I have heard you could rewire it for use of the EM-84 tube,but does this yield accurate results?
The EMM801 has 2 sections, while the EM84 has only 1. Clearly, some functionality will be lost if an EM84 is installed. However, tuning accuracy is not impacted. Stereo indication is what you lose. Look here for instructions about replacing the EMM801 with an EM84.

BTW, if you are willing to replace the MPX adapter with something more modern, the attached circuit developed by MASTER DIYer Steve Bench will recover the stereo indication.
Attached Images
File Type: gif Steve_Bench_MPX_Adapter.gif (19.2 KB, 139 views)
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Old 31st January 2011, 01:52 AM   #9
jfitz57 is offline jfitz57  United States
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Originally Posted by Eli Duttman View Post
BTW, if you are willing to replace the MPX adapter with something more modern, the attached circuit developed by MASTER DIYer Steve Bench will recover the stereo indication.
Hey! That's how I made my TV stereo! Only thing broadcast in stereo back then was some cartoon called Voltron or something like that.
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Old 1st February 2011, 03:30 PM   #10
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Her are a few picks of the progress,I will post as it moves along.
Attached Images
File Type: jpg FM-1.jpg (121.3 KB, 107 views)
File Type: jpg IMG_0219.JPG (141.9 KB, 102 views)
File Type: jpg !CCYEzJgBGk~$(KGrHqV,!hME0fcp2rRcBNK5BOi)!!~~_12.jpg (24.8 KB, 97 views)
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