I just discovered this forum and I am glad to be here. FYI: The last piece of Dynaco equipment I owned was a ST-70 that I paid $15 for. After dusting it and rebiasing its EL34s I used it to drive a pair of Quad 57s for several years. That was (obviously) a while back. More recently I picked up a pair of Mark IIIs that were rescued from the attic of an old Victorian... and I am considering trying to get them going again. The amps are complete, but are very dirty. The 6an8 boards are so badly coated with grime that the resistor color bands are not visible. What do you recommend for safely cleaning 40 year old Dynaco PCBs of grime and flux? I see lots of flux that undoubtedly dates back to the original assembly.
...j
...j