6an8 substitution for Sunn amplifier - diyAudio
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Old 12th January 2013, 07:34 PM   #1
diyAudio Member
Join Date: Jan 2013
Location: Gatineau, Quebec, Canada
Default 6an8 substitution for Sunn amplifier

Hello to all,

I had the chance to put my hands on a '67 Sunn Sentura II tube guitar amplifier. It is in a pretty bad shape but I intend to refurbish it since it is known to have such a great clean tone. I can get all the tubes required in it locally except the 6an8. I have read that it is not made anymore. Is there another tube I can use as a substitution? I was told the 7199 might work but the pin out isn't the same... Is the 6an8 still available? If yes, were???


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Old 12th January 2013, 08:07 PM   #2
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Join Date: Dec 2002
Location: Calgary, Alberta
6AN8 has a unique pinout and has no substitute other than 6AN8A. Your choices are to find another one or rewire for a different tube. They are plentiful enough; you can find them for $6 at vacuumtubes.net and they are a good choice for mail order to Canada.
The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts. Bertrand Russell
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Old 12th January 2013, 08:10 PM   #3
diyAudio Member
Join Date: Jan 2013
Location: Gatineau, Quebec, Canada
Thanks... is there any brands I should look for? Were they better brands when they used to be made?
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Old 12th January 2013, 10:34 PM   #4
tricomp is offline tricomp  Denmark
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Join Date: May 2004
Location: Jutland
I've used 6AN8A with some problems arising.
Sylvania and RCA NOS tubes (1 pair of each) developed a high pitched mechanical whine of sorts after 1-2 months of service. Very annoying and frustrating to listen to but maybe it could have been removed or muffled with the use of tube 'damper-rings'.
I was just lucky enough to stumble over some NOS Toshiba 6AN8 Hi-Fi tubes at a fair price. They've been doing fine for the better part of a year by now and haven't developed any such problems. Other than the lack of vibrations I haven't noticed any other influence or change in sound using Toshiba's over RCA & Sylvie's.
Maybe 7258 is a suitable equivalent.

Scanned data-sheet for the Toshiba's attached.


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File Type: pdf 6AN8_Toshiba.pdf (183.2 KB, 38 views)

Last edited by tricomp; 12th January 2013 at 10:39 PM.
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