[Boatanchors] Re: 6211 tube

Mon, 13 Jan 2003 10:02:17 -0600

I would like to followup...First to apologize for the 'error' of naming the 6J6 as a
"sub" for
the 6211.  This is the "lone" substitution listed but was in the "close" column of
one of the substitution handbooks I have.  I did not research the tube as things have
been hectic and there wasn't time at that moment.
After looking at all the known "JEDEC 9A" based tubes, none of them are really
direct substitutes.  The tube is rather in between the 12AU7 and 12AT7 types
in characteristics.  It would be worth a try to "sub" them for 12AU7 and 12AT7 types
and I'm sure in certain applications they would work.

Again sorry for the hasty error!
73,
Sandy W5TVW
----- Original Message -----
From: "Sheldon Daitch" <[email protected]>
To: "Barry L. Ornitz" <[email protected]>
Cc: <[email protected]>; <[email protected]>
Sent: Monday, January 13, 2003 12:13 AM
Subject: [Boatanchors] Re: 6211 tube

| Barry,
|
| thanks for the additional information.
|
| I'd like a copy of the two PDF files.
|
| THanks,
|
| Sheldon
|
| "Barry L. Ornitz" wrote:
|
| > I believe it was Bob Mattson, W2AMI, who started the thread on
| > the 6211 tube.  There have been lots of interesting responses.
| > It does have the same pinout as a 12AT/AU/AX7 but it is not
| > interchangeable.  I found the following information...
| >
| > From the Sylvania datasheet:
| >
| > "The Sylvania Type 6211 is a miniature, medium mu, twin triode
| > designed for frequency divider circuits in electronic
| > computers, and other 'on-off' control applications involving
| > long periods of operation under cutoff conditions."
| >
| > From the Philips datasheet:
| >
| > "Special Quality double triode with separate cathodes for use
| > in computer circuits.  The 6211 will maintain its emission
| > after long periods of operation under cut-off conditions but
| > is not intended to be used in circuits critical as to hum,
| > microphony, or noise."
| >
| > Interestingly, the Philips datasheet gives specifications on
| > when the tube has reached the end of its useable life.  I can
| > send these datasheets in Adobe PDF format to anyone who wants
| > them.
| >
| >         73,  Barry L. Ornitz     WA4VZQ     [email protected]
|
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