Category Archives: ga120

The GA-120 rocks again!

A friend from forever ago working at Abell Audio took my ailing amp to his bench and diagnosed and repaired a dead fet, voltage regulator, and had an amazing stroke of luck found an fairly unique replacement reverb tank in stock! AMAZING! Chris asked the question “so what are you going to do with this thing?”, a great question. I’ve been really happy playing the baby will head and 2×12 cab. To this point I was just happy knowing that I had saved a unique piece of audio gear from the dump. I set up the amp in the living room (a bit of a treat, the room has a great tone, and my wife usually banishes audio gear to my office or workshop) I had my tele and acoustic set out to leave for practice the next day, the tele sounded fantastic clean with bridge pu, i really like the eq function to tone back the tele honk just a bit. I usually plug my acoustic di to pa but since the ga sounded so great clean I tried the acoustic and was blown away, it sounds awesome.

GA lineup from the 1979 Roland Catalog

1978 Roland GA-120

Solid state vintage….
I’m a sucker, I found a 1978 Roland GA-120 on craigslist, DOA. $40 and I was hauling it out of a store room in the Newport Music hall (sold by the house sound guy). This is a solid state amp that was the predecessor to the Roland JC-120. I ordered a service manual from stereomanuals.com. I tore it down when I got home at cleaned it up a bit. It’s now sitting in my office waiting for some troubleshooting. The first photo shows the cabinet with grill, chassis, and speakers pulled.

Pre Cleaning detail

Tolex is a vinyl product and pledge applied with a toothbrush worked wonders.

The only publicly available reference I found was the users manual in Japanese.

Post tolex cleaning, I think I’ll hit the ply wood with some spray paint before it’s back together.