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

RE: The one with the lowest voltage drop

Posted by Chip647 on December 30, 2024 at 12:35:50:
Real NOS are often stronger than new manufacture tubes, tubes don't diminish sitting on a shelf. There are a lot of flavors of 5U4 as well as manufacturers. Each of the following tube designations represent slightly different construction and performance: 5U4, 5U4-G, 5U4-GA, 5U4-GB, 5U4-GT, 5U4-WG, 5AS4.
Can't go wrong with a 1950's RCA 5U4GB. You want more of an audible difference plug in a couple of (Real, English) Mullard 5AR4s.