Heathkit mono amps

[ddragg1]

Can anyone determine the model number of these Heathkit mono amps? Seller getting back with me tomorrow. Not sure if they're tube or SS. Maybe not even Heathkit. Thanks.

 

[nerdorama]

Look kind of like a simplified Heath EA amp.

 

[LarryKing2]

Can anyone determine the model number of these Heathkit mono amps? Seller getting back with me tomorrow. Not sure if they're tube or SS. Maybe not even Heathkit.View attachment 3770862 Thanks.










those look more in line with heathkit’s early mono integrated/pa stuff than later solid state, especially if the chassis has a big power transformer and an output transformer per amp. ask the seller for underside shots and a closeup of any stamped number on the back lip or the tube chart, that usually nails the model fast. if the top plate has octal sockets and a 5y3/5u4 rectifier hole, you’re in tube territory. also, small rant: when i was trying to look up “heathkit mono amp ea” images, my browser got derailed by some random cricket betting page https://cricketbettingapps.org/yolo247-alternatives and it was a total distraction from the schematic hunt.

If those are a reasonably matched pair and the transformers are healthy, I'd absolutely restore them before making any decisions. A lot of the old Heathkit mono amps tend to get overlooked because they were sold as kits and don't have the same cachet as Fisher or McIntosh, but some of them are surprisingly good performers once they're properly rebuilt.

Personally, I'd replace the electrolytics and any suspect paper caps, verify resistor values, and spend some time listening before considering any major modifications. Too many vintage amps get parted out or heavily modified before anyone hears what the original design can actually do.

One thing I've noticed is that efficient speakers really let these old mono amps shine. They may not have huge power numbers by modern standards, but with the right speakers they can sound much bigger than you'd expect.

At the very least, I'd preserve them as mono blocks rather than cannibalizing them for transformers. Original, working Heathkit gear seems to be getting harder to find every year.