Worlds smallest HiFi valve amp

fergs1 · 9th September 2008, 02:06 PM

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

jormajj · 9th September 2008, 02:11 PM

This is cute:
http://www.roehrentechnik.de/html/kolibri.html

Ty_Bower · 9th September 2008, 02:25 PM

Not much taller than a walnut, huh?

kuroguy · 9th September 2008, 03:09 PM

Is putting the power supply in a separate case and then measuring only the amp section cheating?

poynton · 9th September 2008, 03:27 PM

Cheating ? Yes !

Must include the psu as well.

Andy

fergs1 · 9th September 2008, 04:03 PM

All welcome but extra points for including the power sup.

nhuwar · 9th September 2008, 04:06 PM

If you use nuvistor you could make an even smaller amp.

Nick

vitalstates · 9th September 2008, 04:18 PM

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

nhuwar · 9th September 2008, 04:58 PM

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

vitalstates · 9th September 2008, 06:11 PM

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

9th September 2008, 02:06 PM	#1
fergs1 diyAudio Member Join Date: Jan 2005 Location: melbourne	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

9th September 2008, 03:27 PM	#5
poynton Magneto the Gravity Man diyAudio Member Join Date: Mar 2005 Location: A life on the ocean waves when I'm not at home in N. Wales (but I'm not Welsh so no sheep jokes!)	Cheating ? Yes ! Must include the psu as well. Andy __________________ If it ain't broke, break it !! Then fix it again. It's called DIY !

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9th September 2008, 02:11 PM	#2
jormajj diyAudio Member Join Date: Nov 2002 Location: Finland	This is cute: http://www.roehrentechnik.de/html/kolibri.html

9th September 2008, 02:25 PM	#3
Ty_Bower diyAudio Member Join Date: Mar 2007 Location: Newark, DE	Not much taller than a walnut, huh?

9th September 2008, 03:09 PM	#4
kuroguy diyAudio Member Join Date: Sep 2007	Is putting the power supply in a separate case and then measuring only the amp section cheating?

9th September 2008, 04:03 PM	#6
fergs1 diyAudio Member Join Date: Jan 2005 Location: melbourne	All welcome but extra points for including the power sup.

9th September 2008, 04:06 PM	#7
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	If you use nuvistor you could make an even smaller amp. Nick

9th September 2008, 06:11 PM	#10
vitalstates diyAudio Member Join Date: Jan 2006 Location: uk	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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