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Matt's 6V6 Data and Tests
http://diyaudioprojects.com/Forum/viewtopic.php?f=9&t=5557
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Author:  Suncalc [ 24 Feb 2019, 20:34 ]
Post subject:  Re: Matt's 6V6 Data and Tests

So I have the first set of data. Here is the RMS peak power out vs Vk at each of the chosen plate voltages.
Attachment:
6L6 Po vs Vk.png
This is for the 6L6 operating into a 5kΩ plate load in the SE-UL topology. At first glance, this data looks reasonable.

However, the rest of the data doesn't look nearly so reasonable. First, there are some weird non-linearities and second, the distortion is much higher than expected. So I will have to do some investigations before I can publish more of this data set.

Please stand by...

Author:  Suncalc [ 09 Mar 2019, 21:12 ]
Post subject:  Re: Matt's 6V6 Data and Tests

So here is the new data with a brand new JJ 6L6GC. This is MUCH better and more in line with what I was expecting.
Attachment:
Screen Shot 2019-03-09 at 6.11.05 PM.png
I'll be finishing the writeup and posting the full set of results now that I have the data. Stand by.

Author:  Suncalc [ 10 Mar 2019, 12:10 ]
Post subject:  Re: Matt's 6V6 Data and Tests

So here is a lesson in attentiveness. When you take a spreadsheet that's three years old and modify it without careful review of the contents, errors can creep in. Anyone looking at the curves in the last post should quickly realize that the power numbers were far too large for a 6L6 pentode operated in UL configuration. Some even hinted at greater that a 50% efficiency; an impossibility for a single ended configuration in class A operation. It seems a scaling error creeped in when I was making my modifications so the powers plotted were too large by a factor of SQRT(2). The plot below has the correct values.
Attachment:
Screen Shot 2019-03-10 at 10.02.24 AM.png

Still working on the data analysis for this tube.

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