5691 black base?

Original Burnedfingers · 17th January 2008, 01:23 AM

I purchased a pair of 5691 black base tubes and was wondering if there is any difference between the black base and the red base other than the color of the bases. The black base also has the vertical support bars like the 5691 red base does.

Anyone know?

nkg · 17th January 2008, 11:35 AM

Hi Burntfingers
The only thing I know is RCA made red bases and rebadged them for other companies like GE
whlie sylvania and others made them with brown bases and supposedly the same but I don't
about black what brand is it ? They should all be special quality 10000 hr and closely matched sections and such.
Nigel

kevinkr · 17th January 2008, 03:59 PM

I've had a few of these and because of the black base they are usually inexpensive. My understanding is they were made in the last couple of years of production possibly by Sylvania, but I'm not sure as to who actually made them now.. It was long ago. They sounded fine.

Original Burnedfingers · 18th January 2008, 10:00 AM

Mine have RCA markings with AAF after the RCA logo and 7843 under the RCA logo. They have twin halo's at the top.

17th January 2008, 01:23 AM	#1
Original Burnedfingers diyAudio Member Join Date: Nov 2002	5691 black base? I purchased a pair of 5691 black base tubes and was wondering if there is any difference between the black base and the red base other than the color of the bases. The black base also has the vertical support bars like the 5691 red base does. Anyone know?

17th January 2008, 03:59 PM	#3
kevinkr diyAudio Moderator Join Date: Sep 2004 Location: Boston, Massachusetts Blog Entries: 6	I've had a few of these and because of the black base they are usually inexpensive. My understanding is they were made in the last couple of years of production possibly by Sylvania, but I'm not sure as to who actually made them now.. It was long ago. They sounded fine. __________________ www.kta-hifi.net

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17th January 2008, 11:35 AM	#2
nkg diyAudio Member Join Date: Jul 2004 Location: perth	Hi Burntfingers The only thing I know is RCA made red bases and rebadged them for other companies like GE whlie sylvania and others made them with brown bases and supposedly the same but I don't about black what brand is it ? They should all be special quality 10000 hr and closely matched sections and such. Nigel

18th January 2008, 10:00 AM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	Mine have RCA markings with AAF after the RCA logo and 7843 under the RCA logo. They have twin halo's at the top.

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