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Heathkit tt-1 tester nos tube set (3A4/12AV6)


What is for sale: Heathkit tt-1 tester nos tube set (3A4/12AV6)
NOS Tube set (3A4/12AV6) for HeathKit TT-1
* A 3A4 that is used as an oscillator for producing the 5 KHz AC signal used for the grid signal. Unlike most other testers that simply couple the 60 Hz AC signal for this purpose, the TT-1 uses this higher frequency signal to more accurately reflect a tubes performance at a realistic frequency.
* A 12AV6 that is used for the meter control.
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Heathkit tt-1 tester nos tube set (3A4/12AV6)