Audio Asylum Thread Printer

Get a view of an entire thread on one page

FAQ / News / Events

SET Asylum

RE: Yes

76.90.39.24

Tre'

In Reply to: RE: Yes posted by Lenin on August 25, 2016 at 13:12:19

"...have a rock solid bias because of the low dcr of the interstage. "

I used to think that also but then someone explained that the grid current is not DC per se.

The grid current will start and stop periodically in accordance with the music signal that is causing it.

So now it is the reactance of the winding that comes into play, not the DCR.

A good grid choke (or the secondary winding of a good IT) will have a very high reactance, in many instances higher than the grid resistor that it replaced causing the bias to be less stable under class 2 conditions.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

Follow Ups:

RE: Yes - Lenin 15:38:29 08/25/16 (0)
Grid current can only be there for very large signals where the grid of the powertube is driven in a postive grid signal. Then there is a much lower impedance so the driver has to be much more powerfull then normally. A normal circuit can't handle this but a powerfull driver+ interstage can.
Remember this grid current is a very special situation where impedance is much different then normally so an interstage is still the best solution for a stable bias.

Edits: 08/25/16 08/25/16 08/25/16

Post a Followup:

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.

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

Signature Sound

[ Signature Sound Lounge ]