simply gets it done with more authentic tone and half Although I own several high end boutique amps, I find
I have a 1955 GA-5 equipped with the JANO 5"x7" speaker. it's a 12 on a 10 scale! (Kljjjn Okleshen) I had many a good gig with my friends with it cranked with an Ibanez screaming through it without going deaf. It had such a good crunch to it! I've currently got a boogie blue angel to satisfy my need for blue tone, but I'm gonna miss my kick'in lil GA-5. I just loved the sound that the amp made. I should have had someone look at it first. Currently the amp is not working so I decided to sell it, maybe that's a mistake. The sound with a Les Paul Deluxe was awesome. The controls were mounted on a slanted panel at the upper rear and consist of: 2 inputs, volume control, fuse holder, on/off switch and a jeweled pilot light. The circuit in these is very nearly the same as the Fender 5C1 model 'Champ'. This model had a 10" Jensen speaker and a tube compliment of 1圆SJ7 (pre amp) 1圆V6 (power amp) 1x5Y3 (rectifier). This (see first pic) is a beautiful example of the earliest style GA-5, made in 1954-56 these first three years the GA-5 model designation was 'Les Paul Junior'. Single-ended 6V6 like a Fender 5E1 Champ GA-5 uses only resistors in PS filter, no choke (Miles O'Neal's web-site May 30, 2003) It was fitted with a Jensen 10" field coil speaker. Ciruit wise this amp is an almost identical copy of the Fender Champ (5C1 circuit). The first model GA-5 Les Paul was introduced in 1954. The Gibson amplifier model GA-5 has had many incarnations. Schematic Fender 5C1 Champ Amp (Fender Musical Instruments) Schematic with 1x 6SJ7, 1x 6V6 & 1x 5Y3 (Joe Piazza) Schematic with 1x 6SJ7, 1x 6V6 & 1x 5Y3 (Gibson) Harmony Central Review Les Paul Junior Combo Tubes: 3 (Pre (1圆SJ7), Pow (1圆V6 + 5Y3) (same as the GA-7 Les Paul TV)) Schematic Pre-amp with 2x 6EU7 & 1x 12AU7 (Gibson) Schematic all transistor pre-amp with reverb and tremolo (Gibson) Guitar Transistor/Tube? (Pre-?) Amp with Reverb and Tremolo I'd rate it an 9 for studio and small venue use. Schematic with 4x 6EU7, 1x 12AU7A, 2x 6V6GT & 1x 5Y3GT (Gibson)
When my copy arrived, the reverb tank / FS were long gone bought a used Dan-Echo terrific, musical, sporty amp. This model was later upgraded to the GA1RVT with an additional tube / transformer to operate the reverb. This model was originally fitted with a foot-switched reverb tank to be fed in a very awkward way from an independent separate amp where this amp was to 'echo' the original signal. Single-ended / Class A circuit 12AX7 pre-amp, 6BM8 output with the front triode section operating the Tremolo function, and a 5Y3 rectifier. Breaks up easily, adaptable, simple to work on. If you like the sound clean and round, change coupling caps to. Unless you have and want a museum piece, it will need new / increased power supply caps and resistors, fresh cathode bypass caps, and a new volume pot. Very fine practice, small venue, or recording amp. Schematic with 1x 12AX7, 1x 6BM8 & 1x 5Y3GT (Gibson) Harmony Central Review Maestro Reverb/Echo Combo GA-45T Maestro (Two-Tone), Standard (Tweed)ĨW 1x8" Guitar Combo with Reverb and Tremolo GA-40 Les-Paul (Two-Tone), GA-40T Les-Paul (Tweed) GA-2RT Maestro Deluxe Reverb-Echo (tweed) I'm on my phone right now talking this so I'll get on my computer and Overlook what I said tomorrow because sometimes what I say doesn't come out right on the phone.GA-1RVT Maestro Reverb-Echo (aka Maestro M-1RVT) (tweed) and the only grounding that Amp really had was the rivets on a painted chassis which was not a good idea to start with so having all the ground wires going to the unused pin of the power tube is crucial. It can mess with your mind just a little bit if you've been working on Marshall Plexi and fenders all these years and then you stumble upon an old Tweed Gibson where everything looks strange and different from what you're usually a custom 2 and the grounding scheme. it will work if you ground the CT to the chassis but as Steve set me straight the resistor and the filament has to be grounded as well and all of them being at the same point as it was made originally is the way it should be when caps are replaced. But you must have that CT and first filter stage and ground go to the unused pin one of the power tube to have it as it was originally wired. At the time I just assumed I could take the CT and ground it to the chassis and all it would be fine. Slucky set me straight on that a few months ago. Yes and the original grounding scheme is very important.
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