[Boatanchors] Please review & comment on my Heath Warrior HA-10 amplifier design changes

[Gary Schafer]

Put your original 2.2 ohm grid current shunt from fil center tap to ground
and the 390 ohm meter multiplier to the meter switch. Other side of meter
circuit goes to ground.

The plate current meter shunt is lifted from ground and goes to the top of
the 2.2 ohm grid shunt. This should lift the B- from ground and connect to
the center tap of the fil transformer. Now remove the other side of the
plate current meter lead on the switch that goes to ground and connect it to
the bottom of the plate meter shunt where it connects to the top of the grid
meter shunt.

When you have this place a large diode (1n5408) cathode to the top of the
grid meter shunt and anode to ground for a safety device. It is also a good
idea to place back to back diodes across the grid meter shunt for safety.

73
Gary  K4FMX

> -----Original Message-----
> From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On Behalf
> Of Rick Poole WA1RKT
> Sent: Saturday, November 22, 2014 9:47 PM
> To: boatanchors at mailman.qth.net
> Subject: Re: [Boatanchors] Please review & comment on my Heath Warrior
> HA-10 amplifier design changes
> 
> Good evening, Gary.
> 
> I read that link per some suggestions I received earlier this evening,
> and also page 84 of the Heath SB-220 manual, and came up with some
> revisions to the schematic at http://www.rkt-tech.com/warrior labeled
> "UPDATE".
> 
> If you're so inclined, please take a look at that and let me know if you
> think I'm on the right track.
> 
> Thanks...
> 
> Rick WA1RKT
> 
> 
> ----- Original Message -----
> From: "Gary Schafer" <garyschafer at largeriver.net>
> To: "Rick Poole WA1RKT" <wa1rkt at comcast.net>,
> boatanchors at mailman.qth.net
> Sent: Saturday, November 22, 2014 10:39:52 PM
> Subject: RE: [Boatanchors] Please review & comment on my Heath Warrior
> HA-10 amplifier design changes
> 
> This link will get you started on the metering:
> http://www.w8ji.com/metering_amplifier.htm
> 
> basically the grid meter goes from filament center tap to ground. The
> plate
> current meter goes from the top side of the grid meter to B-. you would
> lift
> the B- from ground and it would now go to the meter shunt.
> 
> Good luck
> Gary  K4FMX
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