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Old 15th September 2004, 11:28 AM   #1
Sandor is offline Sandor  Italy
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Default choke value

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
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Old 15th September 2004, 12:47 PM   #2
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Optimally (is that a word?), XL=(4*RL) at the lowest frequency you want to amplify.

Most designs use between 100 and 300H.
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Old 15th September 2004, 05:32 PM   #3
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For -3dBV at F, L is EXACTLY (as you requested)

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

For your purposes, pi = 3.1415926535897932384626433832795.

Tim
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Old 15th September 2004, 05:39 PM   #4
Fuling is offline Fuling  Sweden
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Quote:
For your purposes, pi = 3.1415926535897932384626433832795.
Tim, please tell us where you get chokes with such low tolerances
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Old 15th September 2004, 07:35 PM   #5
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Default Re: choke value

I sincerely wish I knew.

Quote:
Originally posted by Sandor
HOW CAN I PRECISELY CALCULATE THE REQUIRED INDUCTANCE
Tim
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Old 15th September 2004, 10:03 PM   #6
Fuling is offline Fuling  Sweden
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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
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Old 15th September 2004, 10:12 PM   #7
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Default Excel sheet..

dunno where I got it from...
Attached Files
File Type: zip platechoke.zip (12.2 KB, 56 views)
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Old 16th September 2004, 11:24 AM   #8
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Default Re: Excel sheet..

Quote:
Originally posted by Bas Horneman
dunno where I got it from...

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

Regards,
Yugovitz
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Old 16th September 2004, 11:24 PM   #9
Sandor is offline Sandor  Italy
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Thank you all!

Bas: great tool!

Yougo: nice site indeed!

Paul
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