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The quad of Marantz MA-24s arrived last nite.

Posted by jeffreybehr on October 12, 2011 at 17:10:03:
After unboxing, removing their tops, and blowing some stink off, I got them warming quickly and actually played music! Here they are holding the amppads to the floor.

Removed a bottom cover and was please to see much room around the output-stage PS caps, so I filled a little of it on two amps with pairs of BlackGate VK-series 2200/35 bypass caps. (Original caps are ELNA for Audio 22000/50s.)

Will concentrate, initially, on the inputs, replacing the RCAs with Furutechs, adding 50K TDK pots*, and, to the lower-frequency amps, adding SoniCap Platinum hi-pass filter caps for the Vandersteen 5As' bottom ends**.

Will post schematic soon.

* Will lift the original 56K load resistor too. The amps have WAY too much--as in almost 30dB--Voltage gain, so the pots will allow me to get my preamp gain control where I want it, reduce system noise slightly, and tweak the level of the high frequencies easily.
** The VS Quatros, 5s, and 7s require a preceding, inline, or built-in-the-amp high-pass filter since the speaker has none in its x-overs.