Hello Jimmy, those M7 golden beauties might outlast usthe both of ... Not bad at all for amps that were manufactured somewhere in the late 1980s.... by a company that "no one talks about any more". The only issue they ever had during the wonderful long years that they were in my possession since 1997 until you picked them up well over 10 years later were some output transistors that required a touch of resoldering... The 5-minutes Fix was applied by a good friend of mine at my place, under phone guidance by Jeff Rowland himself.
Now about the Rowland M535 bridgeable.... I have a pair in my system right now breaking in... Preparing a writeup for Audiogon.... These critters are magical... They remind me so much of my M925 monos... May be some 80% of the M925's authority, with a transparency and resulution that is utterly enchanting, particularly when one considers that a bridged pair lists a smidjin below $12K. I'll test M535 in stereo mode once I have completed evaluation in bridged mode.