OTL Asylum

OTL, Output Transformerless Amplifier User Group.

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: NYAL OTL 3

Posted by decca4 on November 22, 2010 at 17:18:37:
Hi Naidu

I am in to my second pair of Futterman H3AA which has the basically the same circuitry as your OTL 3. In my first pair which I used many years ago there was a tendency for the anode plates to glow. The reason for this was most probably that to much current was going through the tubes. The funny thing was that when thy started glowing they sounded the best. The quick remedy was to shut them of for some minutes. In my case I believe as an afterthought that the bias was wrong. It could be that the problem that you have is the same and that the bias needs adjusting. If it is just one of the tubes that starts glowing then I would guess that that one needs replacing.

I have read in some old papers that the tubes should be matched. If this is true or not I don't know. However I think that each pair of tubes should be matched as the same current is expected to through them both. Maybe someone knows more about this than I do.

Good luck