settings for 300b tubes on 539c tester

TubeHound · 13th October 2002, 12:33 AM

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 · 19th October 2002, 11:44 AM

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

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

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19th October 2002, 11:44 AM	#2
GaryB 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: 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

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