secondary of LL7903 as a grid choke?

K&K Audio / Lundahl Transformers

Welcome! Need support, you got it. Or share youe ideas and experiences.

198.152.150.67

Hello,
I have just measured the inductance of secondary (all windings in series) of LL7903 and I have discovered the 540H!
It looks like a good value for a grid choke and similar value to a dedicated lundahl grid choke.
What will be the max. voltage on grid to work with this setup?
It can work only with input tubes or with output tubes also (like -70V on grid)?
To what resistor value this inductance will be correspondent, to choose the proper capacitor value? I usually use 100k with 0.47uF or 130k with 0,33uF.
thanks
Maciej

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

Parts Connexion

Topic - secondary of LL7903 as a grid choke? - MaciekP 05:26:19 12/07/04 (3)

Re: secondary of LL7903 as a grid choke? - KevinC 05:51:31 12/07/04 (2)

I noticed an interesting problem - MaciekP 13:36:35 12/10/04 (1)

maybe a resonance is problem here? (nt? - MaciekP 13:38:19 12/10/04 (0)

You can not post to an archived thread.