[Boatanchors] Heath Warrior - Class B??

[Rick Poole WA1RKT]

The Heath HA-10 Warrior amplifier, using four 811A tubes, is described as a Class B single-ended (all four tubes are in parallel).

I gotta say I haven't ever seen a single-ended Class B RF power amp before, at least not so I'd notice... seems like Class B has always been push-pull to amplify both sides of the waveform.

If I'm reading all of this correctly... any idea what the Heath engineers were thinking when they made this thing run at Class B?

Since I have to redesign/rebuild the bias supply circuit anyway (to incorporate internal cut-off bias), wondering if I should convert this to Class AB2, maybe redesign the whole bias circuit to look more like the Collins 30L-1.

Thoughts?

Rick WA1RKT
Londonderry, NH
Catch me on 14.300 MHz Intercon / MMSN most days