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Old 9th September 2008, 02:06 PM   #1
fergs1 is offline fergs1  Australia
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Default Worlds smallest HiFi valve amp

Greetings, there is a similar thread in the chip amp section of diyAudio so I thought it might be interesting to see the smallest valve based amps( commercial and diy) that have appeared. Photos and schematics and where possible opinions on designs most welcome.
cheers Fergs
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Old 9th September 2008, 02:11 PM   #2
jormajj is offline jormajj  Finland
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This is cute:
http://www.roehrentechnik.de/html/kolibri.html
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Old 9th September 2008, 02:25 PM   #3
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Not much taller than a walnut, huh?
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Old 9th September 2008, 03:09 PM   #4
kuroguy is offline kuroguy  Germany
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Is putting the power supply in a separate case and then measuring only the amp section cheating?
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Old 9th September 2008, 03:27 PM   #5
poynton is offline poynton  United Kingdom
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Cheating ? Yes !

Must include the psu as well.



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Old 9th September 2008, 04:03 PM   #6
fergs1 is offline fergs1  Australia
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All welcome but extra points for including the power sup.
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Old 9th September 2008, 04:06 PM   #7
nhuwar is offline nhuwar  United States
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If you use nuvistor you could make an even smaller amp.


Nick
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Old 9th September 2008, 04:18 PM   #8
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Quote:
If you use nuvistor you could make an even smaller amp.
are you sure?

its a bit disconcerting knowing those valves were designed to go in artillary shells......if music be the food of love etc etc

Ed

edit: ok its a fair cop, I just checked...5902 = 40mm, nuvistor = 20mm
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Old 9th September 2008, 04:58 PM   #9
nhuwar is offline nhuwar  United States
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Quote:
Originally posted by vitalstates


are you sure?

its a bit disconcerting knowing those valves were designed to go in artillary shells......if music be the food of love etc etc

Ed

edit: ok its a fair cop, I just checked...5902 = 40mm, nuvistor = 20mm

Atctually the sub mini's which are used in that amp where the ones used in proximity detonators and not the nuvistor.

Those things were top secret in WW2, I wonder what the designer would think about that amp. If it were me I would think it's pretty cool.

Nick
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Old 9th September 2008, 06:11 PM   #10
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hi nhuwar

I was referring to the 5902 as the valve in the shell during wwii.......I'm pretty sure the nuvistor wasn't developed until the late 1950s....

anyway, enough hijack, apologies

Ed
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