Tube DIY Asylum

Do It Yourself (DIY) paradise for tube and SET project builders.

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: Questions about 6BG6G amp build (schematic) Grommes 216BA

Posted by Eli Duttman on May 23, 2017 at 12:00:31:

It is a variation on the Williamson theme. Compare it to the self biased Heath W5M.

The suggestion to use 6CG7s instead of the less linear 12AU7 is quite sensible. Remember, Williamson used 6SN7s and the 6CG7 is electrically "equivalent" to the 6SN7.

20 muF. in the 1st filter cap. position is good, if the rectifier is a 5R4, but more is OK, if a 5U4 is used.

5R4 data sheet
5U4 data sheet