choke value

[mevang]

How to choose the correct value of the inductance for a choke loading anode in an common cathode stage? I suppose that this depends on Rp of the tube and on the desired frequency lower bound, but
HOW CAN I PRECISELY CALCULATE THE REQUIRED INDUCTANCE FOR THE CHOKE LOAD? Best regards.

Paul

 

[Geek]

Optimally (is that a word?), XL=(4*RL) at the lowest frequency you want to amplify.

Most designs use between 100 and 300H.

 

[Sch3mat1c]

For -3dBV at F, L is EXACTLY (as you requested)

(Rp+RL) * 2 * pi * F / Rp * RL

For your purposes, pi = 3.1415926535897932384626433832795.

Tim

 

[Fuling]

For your purposes, pi = 3.1415926535897932384626433832795.

Tim, please tell us where you get chokes with such low tolerances

 

[Sch3mat1c]

I sincerely wish I knew.

HOW CAN I PRECISELY CALCULATE THE REQUIRED INDUCTANCE

Tim

 

[Fuling]

I know, I just couldn´t keep my mouth shut.
Sorry for that.

Back to the topic:

Ive seen XL=2Rp somewhere, but that might be a bit low

 

[Bas Horneman]

Excel sheet..

dunno where I got it from...

 

[Yugo]

Re: Excel sheet..

dunno where I got it from...

Try this:
www.vt52.com -- DIY Corner - Tips & Tricks - software tools

Regards,
Yugovitz

 

[mevang]

Thank you all!

Bas: great tool!

Yougo: nice site indeed!

Paul