settings for 300b tubes on 539c tester

[TubeHound]

Hi,

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.

 

[GaryB]

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:
300B

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

2A3

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.
---Gary

 

[tubelectron]

Hello TubeHound,

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

MODEL 539B - SUPPLEMENTARY DATA - WESTERN ELECTRIC TUBES
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 :

300A/B
5.0
ER-3200-0
14.0
---
P4
D
4000
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 !

A+!