RE: To Getter or Not to Getter - That is the Question - pictureguy - Tubes Asylum

Tubes Asylum

Questions about tubes and gear that glows. FAQ

RE: To Getter or Not to Getter - That is the Question

In Reply to: To Getter or Not to Getter - That is the Question posted by Triode_Kingdom on July 27, 2021 at 08:48:03:

Getter IMPROVES the vacuum of the tube. It's that simple.

IF they could get a sufficientyly high vacuum before sealing? I don't think they'd need a getter.

But OTOH? The matierials used in the constructin do what's called 'outgas' which in vacuum terms is the emission of reactable gasses into the vacuum

And because the restricted shape of a tube does not 'pump down' as well as a large, open volume, it is difficult to get a tube TO a respectible vacuum.

Viscous flow resembles the flow of water. Knudeson flow is more......randomized....and Molecular flow is when air molecules strike the 'walls' more often then interacting with other gas molecules.

The last is where getters come in. A reactive atom bounces around the interior of the tube and is TRAPPED in a reaction with the getter.

I've worked on vacuum systems which took HOURS to reach ultimate pressure....This after being heated......pumped THAN cooled. At the TOP of what was called the Pumping Stack, there was a Cold Trap consisting of a thimble filled with liquid nitrogen. Many Volitiles 'stuck' to that and improved vacuum level and purity.
Too much is never enough

This post is made possible by the generous support of people like you and our sponsors:

Atma-Sphere Music Systems, Inc.

Follow Ups Full Thread

Topic - Tung-Sol 12AX7 - Copper getter - Byrd69 07:17:36 07/27/21 (12)

RE: Tung-Sol 12AX7 - Copper getter - opalize 20:37:15 07/27/21 (0)

RE: Tung-Sol 12AX7 - Copper getter - pictureguy 18:25:46 07/27/21 (0)

RE: Tung-Sol 12AX7 - Copper getter - Tre' 07:27:35 07/27/21 (9)

RE: Tung-Sol 12AX7 - Copper getter - Byrd69 07:37:07 07/27/21 (8)

RE: Tung-Sol 12AX7 - Copper getter - Tre' 07:42:06 07/27/21 (7)

RE: Tung-Sol 12AX7 - Copper getter - Byrd69 07:57:55 07/27/21 (6)

To Getter or Not to Getter - That is the Question - Triode_Kingdom 08:48:03 07/27/21 (5)

RE: To Getter or Not to Getter - That is the Question - pictureguy 20:17:10 07/28/21 (0)

RE: To Getter or Not to Getter - That is the Question - Tre' 12:46:25 07/27/21 (1)

RE: To Getter or Not to Getter - That is the Question - Triode_Kingdom 21:32:37 07/27/21 (0)

Here's the Getter Materials article - Byrd69 12:05:09 07/27/21 (1)

Thanks! - Triode_Kingdom 21:40:04 07/27/21 (0)

Follow Ups

RE: To Getter or Not to Getter - That is the Question - pictureguy 20:17:10 07/28/21 (0)

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.