Amp/Preamp Asylum

Looking for a new Amp or Preamp? If you're after tubes, post over here.

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

Precision Fidelity M7A V+ problem

Posted by tedroy on February 28, 2012 at 05:22:19:
Gentlemen, looking for some help in figuring out the cause of V+ at 618 volts, when it should be at 550 volts.This has taken out screen grid resistor and 90.9 k resistor at collector of TIP 50. I am working with a partial schematic for this amplifier, and would appreciate getting the full schematic if possible. I have taken this amp to a tech, but the problem has reoccured;including run-away bias, so I'll like to work on it myself with some help this time.