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

[Rick Poole WA1RKT]

From: "Gary Schafer" <garyschafer at largeriver.net>
Sent: Saturday, November 22, 2014 11:13:46 PM
>>
>> 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.

But, the TR relay and the bias zener go between the fil center tap and the junction of the 2.2 and 390 ohm resistors, right?  That's how the TL-922A does it, and how I do it in my latest schematic under the UPDATE (11/22/14 2115 EST) label on the web page.

You mentioned the Kenwood Tl-922, so if I may digress a bit... Any idea why Kenwood grounds the tube grids thru chokes and capacitors rather than directly using big fat low-inductance connections?  That's more or less the way Ameritron did it with the AL-811H and it was nothing but trouble for two years before I got rid of all that stuff and directly grounded the grids, and the thing has been happy and stable ever since.

Rick WA1RKT