[Amps] Alpha Seventy HV Meter Readings

[Paul Christensen]

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 at contesting.com] On Behalf Of Bill Turner
Sent: Friday, January 20, 2017 11:13 AM
To: Amps group <amps at 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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