Tubes Asylum

Questions about tubes and gear that glows. FAQ

Use this form to submit comments directly to the Asylum moderators for this forum. We're particularly interested in truly outstanding posts that might be added to our FAQs.
You may also use this form to provide feedback or to call attention to messages that may be in violation of our content rules.

You must login to use this feature.

Inmate Login

By default, logging in will set a session cookie that disappears when you close your browser. Clicking on the 'Remember my Moniker & Password' below will cause a permanent 'Login Cookie' to be set.

Moniker/Username: The Name that you picked or by default, your email. Forgot Moniker?	Examples "Rapper", "Bob W", "joe@aol.com".
Password:	Forgot Password?
	Remember my Moniker & Password ( What's this?)

If you don't have an Asylum Account, you can create one by clicking Here.

Our privacy policy can be reviewed by clicking Here.

Inmate Comments

From:
Your Email:
Subject:

Message Comments

Original Message

What's the difference between the 5U4, 5U4G, 5U4GA, and 5U4GB tubes?

Posted by PeterCapo on January 10, 2001 at 14:18:28:
Hi,
Can anyone tell me what the differences are between the following tubes?
5U4
5U4G
5U4GA
5U4GB
I don't know, maybe there are yet other variations of these, but I would like to know if they are equivalent to each other and whether or not they are completely interchangeable.
More specifically, my Dynaco (Dynakit) Mark II amps originally used a 5U4GB rectifier. The 5U4GB has straight sides. But, 5U4G rectifiers are available in the ST shape - which looks really cool!
Thanks.
Peter