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Old 23rd Jul 2019, 6:20 pm   #1
snowman_al
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Join Date: Dec 2018
Location: Llandeilo, West Wales, UK.
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Default Heathkit MA-12 stereo pair of amplifiers

This story started 12 months or so ago when I acquired a nice example for a very good price.
No valves but in very good cosmetic condition overall.

It had been nicely built originally and someone had repaired it in the past, with replacement cathode resistors (5 watters!) and EL84 coupling caps. The rest was original - nice black Hunts caps and bulging reservoir electrolytic...
I guess it just faded away and was replaced rather than repaired again?

So it was a fairly easy restoration trying to keep as much originality as I went. Re-stuff the big 60 + 250uF can, replace the 0.1uF Hunts caps with Russian pio caps (the 0.47uF Moldseal caps measured impeccably so were left), replace the cathode bypass caps and swap out a couple of out of spec resistors etc. The 32 + 32uF can was also left as it measured well and reformed nicely. The coax input socket was dismantled and an RCA socket grafted in its place.

Worked first time and all was well, so one down and I was now looking out for another to keep it company.

Pictures are as it arrived 1 and 2, then first power up 3 and 4.
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