Heathkit TT-1A Calibration - diyAudio
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Old 1st January 2005, 01:33 PM   #1
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Default Heathkit TT-1A Calibration

Does anyone here know the calibration procedure for the Heathkit TT-1A tube tester? I have all the manuals *except* the assembly manual, which I suppose, includes it. I'm going to replace the electrolytics today and would like to try and get it back in spec.

Thanks and Happy New Year!

Gary Sanford
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Old 2nd January 2005, 06:17 AM   #2
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Hi,

Did you try here yet?
http://bama.sbc.edu/heath.htm
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Old 2nd January 2005, 11:03 AM   #3
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Sure did. Bama has the ops manual and tube data but not the assembly manual that has the cal procedure.
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Old 2nd January 2005, 12:25 PM   #4
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Dang!

What I would do is take several tubes to a buddy who had a known good tester, write down the results and use those to calibrate it

An assortment like a couple of low gm tubes, a couple of high, power pentodes and a diode or two.
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Old 2nd January 2005, 02:01 PM   #5
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This is a pretty neat tester as it has a self calibration feature. Inside, there is a 4 position rotary switch labeled "bias, signal, meter and operate". There are 3 pots that refer to the first 3 positions and are adjusted using the meter and the front panel settings.

These compare well against the best Hickoks and were offered as kits explaining the self-cal procedure. I have all the manuals in hard copy except the assembly manual that includes the cal data. When I opened it up to recap it I found an "Inspected By" stamp inside, so maybe it was factory assembled and didn't include the service data.

An example is up on Ebay: http://cgi.ebay.com/ws/eBayISAPI.dll...862911922&rd=1
Nice tester...
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