back bias

Tube DIY Asylum

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

hi,

In my amp I have a 50ohm resistor between the power trans CT and the first cap in the LCLC filter. The amp draws 100ma, so the CT is biased -5V with respect to ground.

I want to try using this negative voltage to bias the grid of the input/driver valve, which needs around -3V. After my research on past posts in the forum on various bias methods, I believe this is called back bias.

may I ask for some directions on how best to apply this bias scheme? a schematic would be great help.

thanks!

This post is made possible by the generous support of people like you and our sponsors:

Parts Connexion

Topic - back bias - Vincin 20:57:48 07/31/14 (5)

RE: back bias - Tre' 19:29:35 08/01/14 (0)

RE: back bias - Paul Joppa 19:14:27 08/01/14 (0)

RE: back bias - Palustris 10:22:51 08/01/14 (0)

RE: back bias - tubular.well 23:27:52 07/31/14 (1)

Agree - Triode_Kingdom 06:57:26 08/01/14 (0)

FAQ

Post a Message!

Forgot Password?

Moniker (Username):
Password (Optional):
	Remember my Moniker & Password (What's this?) Eat Me
E-Mail (Optional):
Subject:

Message:	(Posts are subject to Content Rules)

Optional Link URL:
Optional Link Title:
Optional Image URL:
Upload Image:
E-mail Replies:	Automagically notify you when someone responds.

To view your new posting or follow-up, click on the RELOAD or REFRESH button on your browser.