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Sencore tube chart question

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Posted on March 2, 2017 at 18:09:57
Jeffrey Lee
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Posts: 605
Location: Louisville
Joined: September 24, 2002
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July 14, 2011
I have the Mighty Mite TC-136 and could use some advice about the tube chart. For several small signal tubes, there are two sets of numbers with only one difference: The D setting, which is for testing shorts, sometimes has the options of using B or G.

So how do I know which one to use? I assume it matters.

 

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RE: Sencore tube chart question , posted on March 3, 2017 at 11:48:55
Jonesy
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Posts: 1195
Location: Winnipeg, Manitoba
Joined: September 1, 2005
I think that once you rotate D through all positions for the shorts test, the lettered position you should leave it at would be B or G before moving on to the emissions test. Or that perhaps it is normal for that tube to have shorts at position B or G.

My take from the online manual anyways.

Couldn't find a chart.

Cheers!

Jonesy

"I know just enough to get into trouble. But not enough to get out of it."

 

RE: Sencore tube chart question , posted on March 3, 2017 at 17:58:43
Jeffrey Lee
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Posts: 605
Location: Louisville
Joined: September 24, 2002
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  Since:
July 14, 2011
Well, the manual included with my tester says to set everything prior to testing and also to do the short test last, so ...

 

How Sencore's test dual triodes, posted on March 3, 2017 at 18:00:01
JazzDude
Audiophile

Posts: 269
Joined: July 30, 2002
I think I have your answer. Some tubes (such as 6SN7's and 12AU7's) contain 2 triodes. Think of this as 2 individual tubes inside one glass envelope.

To test such tubes in your Sencore each triode is tested individually. Thus your tube data chart indicates 2 lines of set up information for your Sencore's A, B, C, and D set up switches with each line indicating how to adjust those switches to test one of the tube's triodes. I assume this is what you observe when you mention there are 2 sets of numbers in the tube chart for the tubes you asked about.

To test such a tube. Adjust the set up switches to the adjustments indicated in the chart's first line of adjustments, and then perform the tests you wish to run. To test the tube's other triode adjust the switches for the tube chart's second line of adjustments and then perform tests you wish to run.

To test most dual triode tubes with Sencores the settings for the A, B and C switches used to test a tube's 1st triode are the same as those used to test its 2nd triode. Whereas the adjustment on the D switch is different for each of the tube's triodes. Which sounds like the situation you indicated where the only difference in the 2 sets of adjustment numbers for a tube is the setting on the D switch (either the B or G).

 

RE: Sencore tube chart question , posted on March 3, 2017 at 20:06:46
Jonesy
Audiophile

Posts: 1195
Location: Winnipeg, Manitoba
Joined: September 1, 2005
Do you have copies of the Tester manual as well as the Data manual?

The Data manual does concur what you are say in terms of test order. But that doesn't make sense. You really should be testing for shorts before anything else.

Best to follow the Tester manual. See page 3 in particular. It shows it as "calibration test", then "shorts test" and so on. It also explains the different settings for "D" while you are testing the "emissions" of all the sections of the tube.

I've attached a couple pages of the Tester manual.

Cheers!

Jonesy
















"I know just enough to get into trouble. But not enough to get out of it."

 

RE: Sencore tube chart question , posted on March 4, 2017 at 16:46:06
Jeffrey Lee
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Posts: 605
Location: Louisville
Joined: September 24, 2002
Contributor
  Since:
July 14, 2011
Thanks guys! The tester manual is much more in depth than the truncated version attached to the Sencore.

 

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