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Old 12th Apr 2007, 8:09 am   #1
oldeurope
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Smile homebrew hifi-stereo FM valve tuner

Hi, in 1992 I build this FM-tuner. I found it last time at my parents home.
I took some photos made for you and a scan of the schematic.
Maybe it is of interest for those who wants to make one.

Kind regards,
Darius
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Old 12th Apr 2007, 8:27 am   #2
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Smile Re: homebrew hifi-stereo FM valve tuner

additional pics...

Schematics will follow, I have problems with the upload.

Kind regards,
Darius
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Old 12th Apr 2007, 9:31 am   #3
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Default Re: homebrew hifi-stereo FM valve tuner

Darius,

That's amazing, it must have taken many, many hours to design and build

I like the CRT display. What was the commercial tuner that used a similar arrangement? A Marantz, maybe? I'm sure I have an article about it in a back issue of HiFi World somewhere.

Nick.
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Old 12th Apr 2007, 10:04 am   #4
paulsherwin
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Default Re: homebrew hifi-stereo FM valve tuner

Very nice job Darius. How old were you when you made it?

Why did you decide to label the front panel in English not German?

Paul
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Old 12th Apr 2007, 10:17 am   #5
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Default Re: homebrew hifi-stereo FM valve tuner

Quote:
Originally Posted by paulsherwin View Post
How old were you when you made it?
1992-1966=~26
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Old 12th Apr 2007, 10:23 am   #6
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Default Re: homebrew hifi-stereo FM valve tuner

Quote:
Originally Posted by Nickthedentist View Post
1992-1966=26
At least that makes me feel a bit less inadequate - I had a horrible feeling Darius would say he'd made it when he was about 12, an age at which I was struggling to make one transistor MW radios work (mind you I was doing no better at 26)

Paul
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Old 12th Apr 2007, 10:24 am   #7
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Default Re: homebrew hifi-stereo FM valve tuner

I think my best efforts were when I was a teenager (lots of enthusiasm and time). It's all been downhill from there

Was the design entirely your own work, Darius?

Nick.
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Old 12th Apr 2007, 10:52 am   #8
oldeurope
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Smile Re: homebrew hifi-stereo FM valve tuner

Quote:
Originally Posted by paulsherwin View Post
Very nice job Darius. How old were you when you made it?

Why did you decide to label the front panel in English not German?

Paul
Hi Paul,
as a radio amateur I thaught english labeling
is international and modern. (I still think this, but people here often don't.)

Hi Nick,
yes the design is my work.
I have seen this Stereoscope first at the Langenberg FM transmitter (WDR)
and I wanted to have one.
I am happy to show you the
schematic here if I can.
I think it is interesting and has some outstanding developments.
PM me your email and I can mail it to you.

Kind regards,
Darius
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Old 12th Apr 2007, 6:39 pm   #9
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Smile Re: homebrew hifi-stereo FM valve tuner

Good evening,
attached the schematics.

Kind regards,
Darius
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File Type: zip Darius UKW Tuner 1 von 3.zip (130.3 KB, 549 views)
File Type: zip Darius UKW Tuner 2 von 3.zip (146.0 KB, 299 views)
File Type: zip Darius UKW Tuner 3 von 3.zip (132.5 KB, 280 views)
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Old 13th Apr 2007, 10:03 am   #10
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Smile Re: homebrew hifi-stereo FM valve tuner

Quote:
Originally Posted by oldeurope View Post
Good evening,
attached the schematics.

Kind regards,
Darius
Darius
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Old 13th Apr 2007, 7:25 pm   #11
Ed_Dinning
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Default Re: homebrew hifi-stereo FM valve tuner

Hi Darius, a very interesting circuit, as a technophile I like the 'scope. It would look good using the 1BP1 25mm tube.
Were the coils home made or commercial? Can you supply details please?

Best regards, Ed
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Old 14th Apr 2007, 7:19 am   #12
oldeurope
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Smile Re: homebrew hifi-stereo FM valve tuner

Quote:
Originally Posted by Ed_Dinning View Post
Hi Darius, a very interesting circuit, as a technophile I like the 'scope. It would look good using the 1BP1 25mm tube.
Were the coils home made or commercial? Can you supply details please?

Best regards, Ed
Hi Ed,
I bought the DN7-2 and the transformers T1 T2 at a ham flee marked
several years before I build the tuner.
(This ham flee marked is every early december in Dortmund Westfalenhalle.)
The RF- coils are all home made, the coils in the stereo decoder are
commercial ferrite coils.
The 38KHz filter transformer (plate E(C)F) is a small
line frequency transformer.

Kind regards,
Darius
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Old 10th Jan 2008, 8:48 am   #13
oldeurope
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Smile Re: homebrew hifi-stereo FM valve tuner

Quote:
Originally Posted by oldeurope View Post
Hi, in 1992 I build this FM-tuner. I found it last time at my parents home.
I took some photos made for you and a scan of the schematic.
Maybe it is of interest for those who wants to make one.

Kind regards,
Darius
German readers look here:
http://ukw-projekt.blogspot.com/2007...ukw-tuner.html
thanks,
Darius
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