From idkwi–(at)–ail.smart.net Tue Nov 7 11:01:13 CST 1995
Article: 3041 of rec.audio.tubes
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From: Art Sackman
Newsgroups: rec.audio.tubes
Subject: Re: Svetlana 6550B’s
Date: 7 Nov 1995 04:10:00 GMT
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According to recent discussions with Audio Glassic sales staff, they currently sell
Svetlana 6550B2, 6550B3, and 6550C. The 6550B2 has two splashes of getter on the top and
one on the side. The 6550B3 has NO getter spalshed on the top, and two rings on the side,
ouside the plate, which are solid centered and hold getter material which is not splashed
on the glass. This tube is referred to as a “clear top”. The 6550C has two splashes of
getter on the top and none on the side. I previously purchase two sets of Audio Glassics
6550B(the first version, similar to the B2) and Svetlana labeled 6550B’s from ANtique
Electronic Supply. They were identical. The 6500B’s from both sources were identical AND
unique. All the 6550’s I have ever seen , besides these tubes, have seven pins and one
missing pin. These all had eight pins. Also, the pins and bases were unusual, in that they
did not fit the tube socket exactly right. The pins are longer and skinnier, and the
key/guide is also skinnier. With all these anomalies, it was possible, as I stupidly
proved, to put the tube in the socket with the wrong pin facings.

From idkwi–(at)–mart.net Tue Nov 7 11:01:44 CST 1995
Article: 3049 of rec.audio.tubes
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From: idkwi–(at)–mart.net
Newsgroups: rec.audio.tubes
Subject: Re: Svetlana 6550B’s
Date: 7 Nov 1995 04:54:09 GMT
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> Art Sackman writes:
> According to recent discussions with Audio Glassic sales staff, they currently sell
> Svetlana 6550B2, 6550B3, and 6550C. The 6550B2 has two splashes of getter on the top and
> one on the side. The 6550B3 has NO getter spalshed on the top, and two rings on the side,
> ouside the plate, which are solid centered and hold getter material which is not splashed
> on the glass. This tube is referred to as a “clear top”. The 6550C has two splashes of
> getter on the top and none on the side. I previously purchase two sets of Audio Glassics
> 6550B(the first version, similar to the B2) and Svetlana labeled 6550B’s from ANtique
> Electronic Supply. They were identical. The 6500B’s from both sources were identical AND
> unique. All the 6550’s I have ever seen , besides these tubes, have seven pins and one
> missing pin. These all had eight pins. Also, the pins and bases were unusual, in that they
> did not fit the tube socket exactly right. The pins are longer and skinnier, and the
> key/guide is also skinnier. With all these anomalies, it was possible, as I stupidly
> proved, to put the tube in the socket with the wrong pin facings.
>
>
>
>>>>
Now I see how everyone else gets these obnoxious multiple identical posts. I tried out a new internet software package, Netscape,
which did this to me with one click of the mouse, sorry!
It goes in the trash tonight.
Easier to screw up than the first run Svetlana 6550B!

Anyway, to continue (with reliable Internet in a Box), I was told by the Audio Glassics rep that none of the hree of the current Svetlana
6500’s have the offending base. They went back to the typical 7 pin base. Hopefully the pins are the correct size, shape and center
offset ant the guides are correctly sized.