815

nhuwar · 4th October 2009, 11:00 PM

Has anyone ever done anything audio with the 815 dual pentode?

Thanks,
Nick

HollowState · 5th October 2009, 01:31 AM

Yo Nick,
The only use in audio I actually know of was when it was used as the master bias oscillator for the old Ampex 300 tape machines. I've always considered it a junk tube. But I suppose, with the proper ratings reductions, it could be used like an 832A or 829B. The Japanese have probably made use of it at some time. They were masters at forcing oddball tubes into amplifier service. A back issue of Japan's MJ Stereo Technique (Mu-Sen-To-Zi-Ken) will probably have a circuit somewhere. I have some from the late 80s packed away in the garage, but can't easily get at them.

planet10 · 5th October 2009, 02:40 AM

I seem to recall this subject being brought up earlier...

A PP stereo amp with a pair of these would sure be cute...

dave

aardvarkash10 · 5th October 2009, 02:49 AM

they just scream out "Take us to your leader!!" They'd have to be choke loaded though because "resistance is futile!"

gianis · 5th October 2009, 07:30 AM

RCA gives data for pp use in AB2 class.

http://www.classiccmp.org/rtellason/tubedata/815.pdf

Tom Bavis · 5th October 2009, 12:10 PM

I keep a few pair around in case a Stromberg ASR-422 shows up - 6DY7s are truly made of unobtanium...

tubelab.com · 5th October 2009, 01:43 PM

Quote:

they just scream out "Take us to your leader!!" They'd have to be choke loaded though because "resistance is futile!"

I have a few of these "two headed aliens" I briefly cranked one up a few years ago and decided to keep them. They behave like two small sweep tubes in one bottle. No further experimentation was done.

I think that for optimum visual results the drivers should be 7193's. These are two headed alien versions of a 6J5.

4th October 2009, 11:00 PM	#1
nhuwar diyAudio Member Join Date: Jan 2007 Location: Tomball Texas	815 Has anyone ever done anything audio with the 815 dual pentode? Thanks, Nick

5th October 2009, 01:31 AM	#2
HollowState diyAudio Member Join Date: Aug 2006 Location: Taxland, New Jersey	Yo Nick, The only use in audio I actually know of was when it was used as the master bias oscillator for the old Ampex 300 tape machines. I've always considered it a junk tube. But I suppose, with the proper ratings reductions, it could be used like an 832A or 829B. The Japanese have probably made use of it at some time. They were masters at forcing oddball tubes into amplifier service. A back issue of Japan's MJ Stereo Technique (Mu-Sen-To-Zi-Ken) will probably have a circuit somewhere. I have some from the late 80s packed away in the garage, but can't easily get at them. __________________ "The supercomputer is technologically impossible. It would take all of the water that flows over Niagara Falls to cool the heat generated by the number of vacuum tubes required." ~ Professor of Electrical Engineering, New York University

5th October 2009, 02:49 AM	#4
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	they just scream out "Take us to your leader!!" They'd have to be choke loaded though because "resistance is futile!" __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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5th October 2009, 07:30 AM	#5
gianis diyAudio Member Join Date: Jan 2004 Location: athens	RCA gives data for pp use in AB2 class. http://www.classiccmp.org/rtellason/tubedata/815.pdf

5th October 2009, 12:10 PM	#6
Tom Bavis diyAudio Member Join Date: Jun 2002 Location: Macedon NY	I keep a few pair around in case a Stromberg ASR-422 shows up - 6DY7s are truly made of unobtanium...

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