01-18-2016, 12:21 PM
Hi all,
Since 67 people have viewed this, I figured there might be some interest, so here is what I did. Since no one was either willing or able to loan me a calibration tube, I went ahead and purchased a pair of NOS 6L6GA tubes for my 38-690, which I needed anyway. These new tubes were Sylvania with a code date of 1945. They had been tested by the seller at 44/5500 and 46/5750 micromhos respectively, on a recently calibrated TV-7 tube tester.
That was good enough for me. I went ahead and used these tubes to calibrate my Hickok 600A. After which, without touching any of the controls, I measured the gm of all of my 6L6 tubes. You can see them with the results in the pics below.
[Image: http://i135.photobucket.com/albums/q136/...jpghttp://][Image: http://i135.photobucket.com/albums/q136/...s6nzdl.jpg]
[Image: http://i135.photobucket.com/albums/q136/...njhfhc.jpg]
[Image: http://i135.photobucket.com/albums/q136/...53wetk.jpg]
Besides all of my good glass bottle 6L6G's, I have five 6L6 metal tubes, which I will probably never use in radios, that I can use as calibrated test tubes. So, if anyone needs to borrow one to get their Hickok tube tester verified as "in the ballpark", I would be happy to loan you one for round trip first class postal service shipping. This would probably be a couple bucks each way.
Best regards,
Ed
Since 67 people have viewed this, I figured there might be some interest, so here is what I did. Since no one was either willing or able to loan me a calibration tube, I went ahead and purchased a pair of NOS 6L6GA tubes for my 38-690, which I needed anyway. These new tubes were Sylvania with a code date of 1945. They had been tested by the seller at 44/5500 and 46/5750 micromhos respectively, on a recently calibrated TV-7 tube tester.
That was good enough for me. I went ahead and used these tubes to calibrate my Hickok 600A. After which, without touching any of the controls, I measured the gm of all of my 6L6 tubes. You can see them with the results in the pics below.
[Image: http://i135.photobucket.com/albums/q136/...jpghttp://][Image: http://i135.photobucket.com/albums/q136/...s6nzdl.jpg]
[Image: http://i135.photobucket.com/albums/q136/...njhfhc.jpg]
[Image: http://i135.photobucket.com/albums/q136/...53wetk.jpg]
Besides all of my good glass bottle 6L6G's, I have five 6L6 metal tubes, which I will probably never use in radios, that I can use as calibrated test tubes. So, if anyone needs to borrow one to get their Hickok tube tester verified as "in the ballpark", I would be happy to loan you one for round trip first class postal service shipping. This would probably be a couple bucks each way.
Best regards,
Ed
