I ran into an issue using the PAS with the Dynaco ST120. Previously I had Advents or Dynaco A50 hooked to the ST120. Well I now have some Klipsch Forte II, and an unusual situation exists. When powered up, after warm-up of preamp, the woofers on the Klipsch start moving in and out about 1/2", This does not happen with the Advents or A50. I can only assume it is the high efficiency of the Klipsch.
Should I re-install the 510K resistors? Will this lower the output impedance? I measured it with my DMM and got a reading of 678,000 ohms.