[Test-Equipment] B&K 707 tube tester

[Tom NØJMY - AAR7FV]

Seems to me, in my B&K (which is the 747), it consists of a couple of 
light bulbs under the front panel.  Just like the old Conar 400's and 
their oscillators except X2 (for balancing the bridge).  Don't know if 
it's the same on the 707 or not.

73,
Tom

Richard Keller wrote:
> Have just gotten a beauty, both appearance and working. Do not understand the "B&K
> patented automatic line voltage compensation" and would like an explanation of it
> theoretically. I see nothing  in the schematic of the primary other than the winding and
> the power plug plus fuse and on/off switch.
> To what are they referring and is it a legitimate claim? Using a variac and changing the
> supply voltage causes a drop in primary voltage, simple as that. Two secondary windings
> are tapped with a 3-resistor series circuit. I see nothing in the other secondary windings
> out of the ordinary.
> Thanks and 73, Dick KF4NS
> St. Petersburg, FL 33714 USA
> Keep the glow!
>
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