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Old 18th Jul 2010, 9:55 pm   #1
Lee de Forest
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Default winner of the smallest homebrew valve radio competition

I loved this so much I just had to post for others to see
http://www.jogis-roehrenbude.de/Wett...h/rraupach.htm
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Old 18th Jul 2010, 10:06 pm   #2
mickjjo
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Default Re: winner of the smallest homebrew valve radio competition

The translated version :-

http://translate.google.com/translat...tm&sl=de&tl=en

I like that, could it be made smaller? .

Regards, Mick.
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Old 18th Jul 2010, 10:22 pm   #3
G8HQP Dave
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Default Re: winner of the smallest homebrew valve radio competition

Who actually built it - Ralf Raupach or the smug-looking troll?
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Old 18th Jul 2010, 11:12 pm   #4
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Default Re: winner of the smallest homebrew valve radio competition

Well, there is a bit of free air inside the box. Given the size of the O/P TX that's there, a custom TX with some ordinary D- series valves would probably free up enough space to fit batteries in too, instead of hiding them in the cabinet it stands on. Using really small wire ended hearing aid types would save even more space, though output audio would be limited to maybe 50mW. Some ingenuity with capacitors could even see it mains powered!
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Old 19th Jul 2010, 12:33 am   #5
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Default Re: winner of the smallest homebrew valve radio competition

I like the battery packed disguised as a scale sideboard.
Gets my vote for "toleration in the household".
Rob.
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Old 23rd Aug 2010, 1:14 am   #6
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Default Maybe this fellow didn't get to enter .....

That is an interesting receiver. It certainly isn't the smallest, however ...click on the following link:-

http://www.hi-ho.ne.jp/ux-45/index.htm

The site is a bit of a dog's dinner, at least on my comuter, as it doesn't handle Japanese characters ... but take a look at the size of the 4-'tube' superhet .... astounding stuff.

David
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Old 23rd Aug 2010, 1:00 pm   #7
kalee20
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Default Re: winner of the smallest homebrew valve radio competition

I'm really impressed! Especially the 8-valve AM/FM radio (though it does have a couple of nasty g*rm*n**m diodes).
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Old 24th Aug 2010, 8:52 pm   #8
corvair
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Default Re: winner of the smallest homebrew valve radio competition

It does seem a shame to use solid state devices in that radio ... any radio, come to that ... a couple of GZ34s would have done nicely!

Thing about transistors, in my experience at least, is that they always blew and protected the fuses. And they wouldn't just wear out slowly like valves; they're a bit like pigs - they either go, or they don't.

But the level of miniaturisation by that Japanese gentleman is, in my eyes, nothing short of miraculous.

David
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Old 24th Aug 2010, 11:36 pm   #9
Herald1360
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Default Re: winner of the smallest homebrew valve radio competition

Only one thing I can say about these....

I WANT ONE!
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Last edited by Brian R Pateman; 25th Aug 2010 at 12:12 pm. Reason: Font corrected.
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Old 25th Aug 2010, 11:29 am   #10
dominicbeesley
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Default Re: winner of the smallest homebrew valve radio competition

I wouldn't fancy repairing that! The underside of the chassis looks like the forlorn Saba that is awaiting repair...trouble is every time I poke the soldering iron in it comes out with a few polystyrene caps smoking away on the bit....

Dom
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