Bill,
The Alpha 70 series definitely connects the HV meter return to chassis
ground and not B-. As designed by Alpha, it must be that way, since the
multimeter is shared with several other functions including forward and
reverse power. A dedicated HV meter would not have this limitation and the
series string of components could be connected between B+ and B-.
Paul, W9AC
-----Original Message-----
From: Amps [mailto:amps-bounces@contesting.com] On Behalf Of Bill Turner
Sent: Friday, January 20, 2017 11:13 AM
To: Amps group <amps@contesting.com>
Subject: Re: [Amps] Alpha Seventy HV Meter Readings
I don't have the 70x schematic before me, but if it is like most modern
amps, ground is not B-. HV should be measured from B+ to B-.
not from, B+ to ground. Check your schematic.
The difference is not great - only the amount of cathode bias, but it needs
to be taken into consideration to be correct.
73, Bill W6WRT
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