[EE] Vacuum tube (valve) pin diameter

Discussion:

Bob Blick

2018-03-28 16:58:28 UTC

Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such as the 12AX7A? I'm measuring about .040" but I can't find a spec for what it should be or what the tolerance is.

Thanks!

Bob

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Jean-Paul Louis

2018-03-28 17:36:05 UTC

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Hi Bob,

Noval type tubes pins were always 1.016mm or 0.040in nominal.
I can’t remember the tolerance of the pins, but most likely I would say
0.040 +/- 0.001 would be state of the art technology of these times.

Just my two cents,
Jean-Paul
N1JPL

Post by Bob Blick
Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such as the 12AX7A? I'm measuring about .040" but I can't find a spec for what it should be or what the tolerance is.
Thanks!
Bob
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Van Horn, David

2018-03-28 18:04:54 UTC

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The pin sockets were pretty forgiving.

I don't have one handy but a copy of the RCA Receiving tube manual should have that info if anything will.

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob Blick
Sent: Wednesday, March 28, 2018 10:58 AM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: [EE] Vacuum tube (valve) pin diameter

Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such as the 12AX7A? I'm measuring about .040" but I can't find a spec for what it should be or what the tolerance is.

Thanks!

Bob
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Van Horn, David

2018-03-28 18:08:07 UTC

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http://www.tubebooks.org/tubedata/RC30.pdf

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of Bob Blick
Sent: Wednesday, March 28, 2018 10:58 AM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: [EE] Vacuum tube (valve) pin diameter

Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such as the 12AX7A? I'm measuring about .040" but I can't find a spec for what it should be or what the tolerance is.

Thanks!

Bob
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j***@jpes.com

2018-03-28 20:35:26 UTC

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The IEC 67-I-12a specification calls for a 36-degree angle between the
nine pins of 1.016 mm thickness, in an arc of diameter 11.89 mm.

Regards,

Jim

-------- Original Message --------
Subject: [EE] Vacuum tube (valve) pin diameter
Date: Wed, March 28, 2018 11:58 am
Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such as the 12AX7A? I'm measuring about .040" but I can't find a spec for what it should be or what the tolerance is.
Thanks!
Bob
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Bob Blick

2018-03-28 21:31:45 UTC

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I guess the tolerance is pretty close since they used so many decimal places!

Thanks to everyone for the replies.

Friendly regards,

Bob
________________________________________
From: piclist-***@mit.edu <piclist-***@mit.edu> on behalf of jim
Sent: Wednesday, March 28, 2018 1:35 PM
To: Microcontroller discussion list - Public.
Subject: RE: [EE] Vacuum tube (valve) pin diameter

The IEC 67-I-12a specification calls for a 36-degree angle between the
nine pins of 1.016 mm thickness, in an arc of diameter 11.89 mm.

Regards,

Jim

-------- Original Message --------
Subject: [EE] Vacuum tube (valve) pin diameter
From: Bob Blick
Date: Wed, March 28, 2018 11:58 am
Anyone know the spec for pin diameter of a 9 pin miniature vacuum tube such as the 12AX7A? I'm measuring about .040" but I can't find a spec for what it should be or what the tolerance is.
Thanks!
Bob

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j***@jpes.com

2018-03-28 22:14:08 UTC

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Yeah, the pin diameter resolution is 1 micrometer. That's pretty
small.
I wouldn't think the pins would be all that critical, but maybe they
are.

Regards,

Jim

-------- Original Message --------
Subject: Re: [EE] Vacuum tube (valve) pin diameter
Date: Wed, March 28, 2018 4:31 pm
I guess the tolerance is pretty close since they used so many decimal places!
Thanks to everyone for the replies.
Friendly regards,
Bob
________________________________________
Sent: Wednesday, March 28, 2018 1:35 PM
To: Microcontroller discussion list - Public.
Subject: RE: [EE] Vacuum tube (valve) pin diameter
The IEC 67-I-12a specification calls for a 36-degree angle between the
nine pins of 1.016 mm thickness, in an arc of diameter 11.89 mm.
Regards,
Jim

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Van Horn, David

2018-03-28 22:29:41 UTC

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Look at a tube socket. The ones I remember were leaf springs and hardly critical.

However, the pin diameter tolerance may be an artifact of how the wires are sealed into the glass. I've been learning a bit about that, and it's way more complicated than I would have thought.

-----Original Message-----
From: piclist-***@mit.edu <piclist-***@mit.edu> On Behalf Of ***@jpes.com
Sent: Wednesday, March 28, 2018 4:14 PM
To: Microcontroller discussion list - Public. <***@mit.edu>
Subject: RE: [EE] Vacuum tube (valve) pin diameter

Yeah, the pin diameter resolution is 1 micrometer. That's pretty small.
I wouldn't think the pins would be all that critical, but maybe they are.

Regards,

Jim

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