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#1
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TV7 tester Question
Howdy All,
Well traded for a TV7 today and I have been testing some tubes.I seem to recall seeing that there was a formula for converting the scale reading to micromhos.I did some surfing and I just did not get the right search phrase I guess.I found a statement that new is 153% of min. Can anyone verify that and or add their 2 cents.Guess it just might be time to buy the book by Alan Douglas.I find some snipetts by him on the net and he seems pretty lucid.Ya out there Mr Douglas? Any way does not seem to have been the standard tube tester thead in awhile.So let er rip. WesJ..... |
#2
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On Sun, 20 Feb 2005 20:36:03 -0800, "Wes Jacson"
wrote: Howdy All, Well traded for a TV7 today and I have been testing some tubes.I seem to recall seeing that there was a formula for converting the scale reading to micromhos.I did some surfing and I just did not get the right search phrase I guess.I found a statement that new is 153% of min. Can anyone verify that and or add their 2 cents.Guess it just might be time to buy the book by Alan Douglas.I find some snipetts by him on the net and he seems pretty lucid.Ya out there Mr Douglas? Any way does not seem to have been the standard tube tester thead in awhile.So let er rip. Here's an old one: "From the TM 11-6625-274-12 Operator's and Organizational Maintenance Manual. Page 18. Reading Meter. The following chart may be used to convert the numerical value of the meter reading to mutual conductance in micromhos. Corresponding Value in micromhos Meter Range B Range C Range D Range E 0 0 0 0 0 10 250 500 1250 2500 20 500 1000 1500 5000 30 750 1500 3750 7500 40 1000 2000 5000 10000 50 1250 2500 6250 12500 60 1500 3000 7500 15000 70 1750 3500 8750 17500 80 2000 4000 10000 20000 90 2250 4500 11250 22500 100 2500 5000 12500 25000 110 2750 5500 13750 27500 120 3000 6000 15000 30000 Hope it helps. Chong in Va. Good fortune, Chris Hornbeck |
#3
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Farout Chris!!!
Thank You, I have been messing with it and have found it to fail a few tubes that test ok,low,but ok on a couple other testers.And some tubes that were so so test well within range on the Tv7. I figured it would be a brutal tester but it seems to test well. It was gone through in dec 04 buy a fella in Arizona.Came with a calibration report and parts installed list.Seems pretty profesional. I am going to download that manual tonight.I traded a bunch of icky old ham tubes for it.And that is one less tool I need.Now i can sell those "other" testers. Have fun and Thanks Again WesJ..... "Chris Hornbeck" wrote in message ... On Sun, 20 Feb 2005 20:36:03 -0800, "Wes Jacson" wrote: Howdy All, Well traded for a TV7 today and I have been testing some tubes.I seem to recall seeing that there was a formula for converting the scale reading to micromhos.I did some surfing and I just did not get the right search phrase I guess.I found a statement that new is 153% of min. Can anyone verify that and or add their 2 cents.Guess it just might be time to buy the book by Alan Douglas.I find some snipetts by him on the net and he seems pretty lucid.Ya out there Mr Douglas? Any way does not seem to have been the standard tube tester thead in awhile.So let er rip. Here's an old one: "From the TM 11-6625-274-12 Operator's and Organizational Maintenance Manual. Page 18. Reading Meter. The following chart may be used to convert the numerical value of the meter reading to mutual conductance in micromhos. Corresponding Value in micromhos Meter Range B Range C Range D Range E 0 0 0 0 0 10 250 500 1250 2500 20 500 1000 1500 5000 30 750 1500 3750 7500 40 1000 2000 5000 10000 50 1250 2500 6250 12500 60 1500 3000 7500 15000 70 1750 3500 8750 17500 80 2000 4000 10000 20000 90 2250 4500 11250 22500 100 2500 5000 12500 25000 110 2750 5500 13750 27500 120 3000 6000 15000 30000 Hope it helps. Chong in Va. Good fortune, Chris Hornbeck |
#4
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Hi,
It was gone through in dec 04 buy a fella in Arizona.Came with a calibration report and parts installed list.Seems pretty professional. That would be Dan Nelson, who does excellent work. You can find all the tube data that ever existed on Nolan Lee's "Redneck Boatanchor" site: http://www.acadiacom.net/nlee/ The TV7B is my tester of choice for day-to-day checking, much easier than setting up one of the bigger machines or walking to the other end of the cellar where the Cardmatic is. 73, Alan |
#5
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Hi,
It was gone through in dec 04 buy a fella in Arizona.Came with a calibration report and parts installed list.Seems pretty professional. That would be Dan Nelson, who does excellent work. You can find all the tube data that ever existed on Nolan Lee's "Redneck Boatanchor" site: http://www.acadiacom.net/nlee/ Actually, Dan & I have updated Nolan's tube data spreadsheet extensively over the last couple of years, including new tube entries and errors corrected. Email me if you would like a copy. cheers! cowboy |
#6
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Alan: Just curious, why the TV7-B rather than the later D/U? Are there any significant differences in circuit or features that make the B model more desirable as an all around daily driver? Roger in VT Alan Douglas wrote: Hi, It was gone through in dec 04 buy a fella in Arizona.Came with a calibration report and parts installed list.Seems pretty professional. That would be Dan Nelson, who does excellent work. You can find all the tube data that ever existed on Nolan Lee's "Redneck Boatanchor" site: http://www.acadiacom.net/nlee/ The TV7B is my tester of choice for day-to-day checking, much easier than setting up one of the bigger machines or walking to the other end of the cellar where the Cardmatic is. 73, Alan |
#7
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Hi,
Just curious, why the TV7-B rather than the later D/U? Are there any significant differences in circuit or features that make the B model more desirable as an all around daily driver? Roger in VT Mostly because that's what Fair Radio sent me when I ordered two and asked for different models (the other was a plain TV7 made by Supreme. The B is a Hickok). But I do like the particular 4-pin socket in the B. 73, Alan |
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