Batch testing NOS 6SN7 Sylvania: results

[Patrick]

test lot: Sylvania NOS 6SN7GT D-plates, tall envelope, 36pcs
total: 36 (100%)
halves identical: 5 (13.8%)
halves within 2.5%: 5 (13.8%)
halves within 5%: 5 (13.8%)
halves within 7.5%: 3 (8%)
halves higher spread: 18 (50%)
pairs identical: 1
pairs within 2.5%: 2
pairs within 5%:1

[Tom Schlangen]

Hi Patrick,

> wrote:
> test lot: Sylvania NOS 6SN7GT D-plates, tall envelope, 36pcs
> total: 36 (100%)
> halves identical: 5 (13.8%)
> halves within 2.5%: 5 (13.8%)
> halves within 5%: 5 (13.8%)
> halves within 7.5%: 3 (8%)
> halves higher spread: 18 (50%)
> pairs identical: 1
> pairs within 2.5%: 2
> pairs within 5%:1

lots of numbers and percentage ratios, but what was actually
measured? Maybe the length of the plate structure in millimeters?

Anyway, I am reluctant to trust any statistic I didn't fake myself.

Tom

--
A consultant is a man who knows 40 ways to make love,
but doesn't know any women.

[[email protected]]

Tom Schlangen wrote:
> Hi Patrick,
>
> > wrote:
> > test lot: Sylvania NOS 6SN7GT D-plates, tall envelope, 36pcs
> > total: 36 (100%)
> > halves identical: 5 (13.8%)
> > halves within 2.5%: 5 (13.8%)
> > halves within 5%: 5 (13.8%)
> > halves within 7.5%: 3 (8%)
> > halves higher spread: 18 (50%)
> > pairs identical: 1
> > pairs within 2.5%: 2
> > pairs within 5%:1
>
> lots of numbers and percentage ratios, but what was actually
> measured? Maybe the length of the plate structure in millimeters?
>
> Anyway, I am reluctant to trust any statistic I didn't fake myself.
>
> Tom
>
> --
> A consultant is a man who knows 40 ways to make love,
> but doesn't know any women.

Hi RATs!

Now, take the good pair and the worst pair see if you can hear anything
change in a system.

Happy Ears!
Al

An expert is a man who knows so many ways to make love he doesn't need
to count the women ;)

[robert casey]

Patrick wrote:

> test lot: Sylvania NOS 6SN7GT D-plates, tall envelope, 36pcs
> total: 36 (100%)
> halves identical: 5 (13.8%)
> halves within 2.5%: 5 (13.8%)
> halves within 5%: 5 (13.8%)
> halves within 7.5%: 3 (8%)
> halves higher spread: 18 (50%)
> pairs identical: 1
> pairs within 2.5%: 2
> pairs within 5%:1
>

Just like with transistors, an engineer has to design his circuits to
not be sensitive to the above variations. This makes for better
production manufacture, and also helps as tubes age in the field.

[Patrick]

"Tom Schlangen" > schreef in bericht
...
> Hi Patrick,
>
> > wrote:
>> test lot: Sylvania NOS 6SN7GT D-plates, tall envelope, 36pcs
>> total: 36 (100%)
>> halves identical: 5 (13.8%)
>> halves within 2.5%: 5 (13.8%)
>> halves within 5%: 5 (13.8%)
>> halves within 7.5%: 3 (8%)
>> halves higher spread: 18 (50%)
>> pairs identical: 1
>> pairs within 2.5%: 2
>> pairs within 5%:1
>
> lots of numbers and percentage ratios, but what was actually
> measured? Maybe the length of the plate structure in millimeters?
>
> Anyway, I am reluctant to trust any statistic I didn't fake myself.
>
> Tom
>
> --
> A consultant is a man who knows 40 ways to make love,
> but doesn't know any women.

Transconductance was measured using a Hickok 533A, taget average value 2600.
the results are from 2200-33400. largest difference between halves 700
micromohs.

Patrick

[Tom Schlangen]

Hi Patrick,

thank you for clarifying.

Tom

--
MS-DOS is the worst text adventure game I have ever played:
Poor vocabulary, weak parser and boring storyline.

[Patrick]

"Patrick" > schreef in bericht
...
>
> "Tom Schlangen" > schreef in bericht
> ...
>> Hi Patrick,
>>
>> > wrote:
>>> test lot: Sylvania NOS 6SN7GT D-plates, tall envelope, 36pcs
>>> total: 36 (100%)
>>> halves identical: 5 (13.8%)
>>> halves within 2.5%: 5 (13.8%)
>>> halves within 5%: 5 (13.8%)
>>> halves within 7.5%: 3 (8%)
>>> halves higher spread: 18 (50%)
>>> pairs identical: 1
>>> pairs within 2.5%: 2
>>> pairs within 5%:1
>>
>> lots of numbers and percentage ratios, but what was actually
>> measured? Maybe the length of the plate structure in millimeters?
>>
>> Anyway, I am reluctant to trust any statistic I didn't fake myself.
>>
>> Tom
>>
>> --
>> A consultant is a man who knows 40 ways to make love,
>> but doesn't know any women.
>
> Transconductance was measured using a Hickok 533A, taget average value
> 2600.
> the results are from 2200-33400. largest difference between halves 700
> micromohs.
>
> Patrick
Typo: replace "taget" by "target", "33400" by "3400"

Patrick