Looks like no one is interested in this sticky beyond coffee mugs.
Anyone have an opiniun/experience with the Rightmark analyser program?
Normal has a capacitor in series with the input for preamps that have a DC component in their output, direct bypasses the capacitor and allows even DC to get to the preamp section in the amplifier. Using the direct with a tube preamp can zap the input stage since many tube preamps can put out several volts during warm up.
When you pull the driver boards you are ready to re-solder the molex connector pins, these are the #1 cause of failure in this series of amplifiers.
When installing an amplifier onto a shelf, it is made much easier if the shelf and feet of the amplifier has been wiped down with some Pledge or Endust.
It would be nice if a common format freeware program would allow all to publish their mod's measurements, other than just "listening" impressions. This would open up some of these updates for discussion.Those with traditional old school testing measures would then also have a way to display what we discover as we work through repairs and such on these vintage units.
There is a program available at a modest cost. The problem with an audio analysis program is it takes some time to learn it. I did take some measurements and published them with my MC2500 mods.