Had these two Mac amps come in a few weeks ago.....with an important problem as well as a huge challenge.
This Mc2100 upon bench testing could deliver maybe 3 watts before distortion pegged the Sound Technology meter. Pulled the bottom cover and cage and found three heatsinks flopping around, 6 of the 8 phenolic mounting bracket/stand offs were shattered. This amp came out of the big city, could have been used in a bar, but I think it was a roadie.
There are no burn marks on the driver cards. pulled the outputs and they are not shorted but the positive feed wires have gotten very hot. I think the heat sink at +35 volt shorted to the cage.....important for all you first gen transistor owners to keep track of.
Second set of pics is of a MC2125 meter set. I have never in 36 years seen a set so busted up. Has any one else? Fortunately the new owner works for the local company that supplies LED lighting to the police/emergency vehicle market....he is searching for a solution.
This Mc2100 upon bench testing could deliver maybe 3 watts before distortion pegged the Sound Technology meter. Pulled the bottom cover and cage and found three heatsinks flopping around, 6 of the 8 phenolic mounting bracket/stand offs were shattered. This amp came out of the big city, could have been used in a bar, but I think it was a roadie.
There are no burn marks on the driver cards. pulled the outputs and they are not shorted but the positive feed wires have gotten very hot. I think the heat sink at +35 volt shorted to the cage.....important for all you first gen transistor owners to keep track of.
Second set of pics is of a MC2125 meter set. I have never in 36 years seen a set so busted up. Has any one else? Fortunately the new owner works for the local company that supplies LED lighting to the police/emergency vehicle market....he is searching for a solution.