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Old 13th October 2002, 12:33 AM   #1
diyAudio Member
Join Date: Dec 2006
Default settings for 300b tubes on 539c tester


Can some one please point me in the right direction to find out what the settings for the Hickok 539c vacuum tube tester are for a 300b type tube. I much appreciate this. Thank you.
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Old 19th October 2002, 11:44 AM   #2
GaryB is offline GaryB  United States
diyAudio Member
Join Date: Sep 2002
Location: Silicon Valley
I did a bit of checking and can make a recommendation. I did this by comparing the settings from my TV7 tester and 539C testers. The TV7 tester recommends:

5.0 ER3-2000 60 (bias) C (range) 58 (transconductance)


2.5 ER3-2000 67 (bias) C(range) 38 (transconductance)

On the TV7 a transconductance of 38 (arbitrary units) is actual
1900uMhos. A setting of 58 translates to 2900uMhos

The 539C only has a listing for the 2A3. It recommends:

2.5 ER3-2000 24(bias) D (range) 1900(transconductance)

Extrapolating this to a 300B, I would suggest:

5.0 ER3-2000 21.5(bias) D(range) 2900(transconductance)

Let me know if this works out for you.
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Old 25th February 2014, 05:58 PM   #3
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Join Date: Apr 2008
Hello TubeHound,

The 539B settings for the 300A/B tube exists in a factory-issued document called :

dated 3-9-56

You should be able to find it at :

Hickok Documentation, Manuals, Schematics, and Catalogs

Here's what it states, according to the Hickok 539 roll-chart codification :

Short on A

I am very interested to know your measurements results to compare with the ones I have on my 539B and C...

Thanks !

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