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

45 tube B+ question...HELP!

Posted by mike33123 on March 20, 2006 at 16:09:23:
I am experimenting with a 45 SET amplifier circuit as follows:
6SN7 driver with interstage transformer secondary to the grid of the 45, 1.35K bias resistor and 25MFD oil capacitor in parallel to it from the cathode to ground...the filiment connected to the typical hum pot arrangement. The plate is connected to a 3.5K Single ended output transformer. The question is that I have 310 to 320 VDC measured at the plate of the 45 to ground. The amplifier plays fine. Is the B+ too high to be safe for this tube? I notice no "red plate" glow and there is no distortion. Thanks for your input.