[Test-Equipment] Millen GDO question

[Ron Youvan]

Richard Knoppow wrote:

>       Some of you know that I obtained the VHF "coil"
>   actually a hair pin through the kindness of a fellow on
> this list. My question is for others with the same meter.
> How much current is normal for hairpin to indicate? Mine is
> quite low and I think it quits oscillating below about
> 140mhz. That is the low frequency limit as given in the
> handbook so it might be normal. The hairpin appears to be
> perfect and the tube tests good, actually rather hot, on two
> different testers. So, I suspect this is normal but want to
> confirm that. The current indicated on the meter varies with
> different coils but is significantly higher on the next
> lowest one. Its curious that the output is lower at the low
> end of the band but that's true of all the coils.

   If we are discussing the meter reading, it is a function of the oscillator tube's grid current.
Try another tube and see if it continues to oscillate throughout the frequency range of it's UHF band.
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