Gates STA Output Pads

[gg85]

Wondering if someone could explain to me what is going on with the output pad/attenuator in the sta level. Looks like a fixed 10dB pad with another 6dB attenuation via the output pot, but is it an O-pad or H-pad...I'm not fully understanding the resistor values for 600/600 output and how they've been calculated, or what type of pad it is. Is the 1200r in parallel with the 200r and 1k pot (giving 600r), and if it's a H-pad why are the series resistors different? Trying to wrap my head around it!

Thanks

 

[emrr]

Primarily it’s designed to share a minimum Z of roughly 500. Look at r29/30 as build-outs. Consider the feedback in the amp makes output Z lower than 500 already.