Beast with a Thousand JFETs

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tiefbassuebertr

tiefbassuebertr

Member
Joined 2005
tiefbassuebertragung.de
SY said:
Didn't someone (maybe Tim de Paravicini) do this with 12AX7s?
Click to expand...

Yes, that was realized at the EAR Yoshino V20 Amplifier from Mr. Tim de Paravicini. 10x ECC8*/12A*7 at each halve - go to
http://www.ear-yoshino.com/prodpics/V20_Integrated_Amplifier_t.jpg
http://www.walrus.co.uk/ear/v20.jpg
http://www.stereophile.com/integratedamps/1099ear/
http://www.diyaudio.com/forums/showthread.php?t=94403
http://www.diyaudio.com/forums/attachment.php?attachmentid=78488&d=1170054327

Also by the Krell MRA you will find large groups of paralleling semiconductors, go to
http://www.diyaudio.com/forums/showthread.php?t=3508
http://www.krellonline.com/krell_component.php?id=30&page=MRA
http://www.premieraudio.ca/uploads/images/MRA_Amp.jpg
http://www.stereotimes.com/event010101.shtml

I am very interested at your comments about sonic impressions, when this amplifier approach here is finished. Are there not such solutions as integrated circuits from Toshiba on the market (MET = Multi Emitter Transistor)? I mean not "Multiple Emitter Transistor" from TTL topology.
please read
http://www.freepatentsonline.com/3946425.html
the integrated circuits, that I mean, actually BjT power devices, special made for audio and internal multi emitter structure
 
D

DSP_Geek

Member
Joined 2003
flg

flg

Member
Joined 2005
ElFishi said:
salad oil will do
http://www.markusleonhardt.de/en/oelbilder.html
Click to expand...

Sooner or later, I figured someone would have come along who might want to discuss such things on these threads. I'll start by saying, Been there done that. Cray, Chippewa Falls, 3M Flourinert, etc. etc...
Saying "salad oil would do" does not make me wanna go look up the boiling point of salad oil, but did you get that nucleate boing thing from those links? Vasaline may be the same??? Flourinert that was used by Cray, and myself, cost between $350. and $550. a gallon (Then). Their phone booth looking CPU and my burn-in bath both used $20,000 + worth of Flourinert!!! I would have thought the educated dudes before me would have set me up with Vasaline if it was so easy??? Or, I at least would have seen a SOZ in Vasaline by now ;)
If some here only new what all that was about :D
My biggest problem with that project would proably be the death of your amps performance (I have not actually tried an amp imersed). The nucleate boilng makes a noise (memory distortion like stuff) which would likely end up on the signal path???
 
Variac

Variac

diyAudio Editor
Joined 2001
BurningAmp.org
Paid Member
I think at the cost of the jfets and Mr. Pass's time that a couple of gallons of flourinert would not be a deal breaker.. if it is actually required. And only a couple of gallons would be required- those boards and their populations are not very tall... I also would think a liquid would be better than a goo because it can circulate, which should help with cooling quite a bit.
 
DaveM

DaveM

Member
Joined 2003
Isn't the idea to use lots of small capacity devices to get the needed power? I would think that with that your heat dissipation should be small per device and heat sinking shouldn't be necessary. I would guess that a couple slow spinning box fans would be perfect. Unless of course you were after a higher power version.
 
c2cthomas

c2cthomas

Member
Joined 2006
Paid Member
Put da beer in one side and da PassFET1000+ in da other. Two birds with one stone!!! :rolleyes:
 

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