In the 1940s and 1950s, gibsons continuing advances in amplifier design matched the companys celebrated guitar innovations. The larger gif looks almost as good as the jpeg on most computer screens. Introduced by gibson in 1950, the ga20 was a twochannel, 12. Farmhouse guitars, june 19, 2003 so mine is branded ga 8t discoverer but has a 12 jensen, one 12ax7 pre, 2 ecl826bm8 and a 5y3 rectifier.
I have aquired a gibson g80 chassis and a schematic. Ga6 lancer ga8 gibsonette ga8t ga9 ga14 titan same as ga6 ga15 maestro ga15rvt explorer ga16t viscount ga17rvt scout ga18t explorer ga19rvt falcon ga20 ga20t ga20rvt minuteman ga25 ga. The schematic calls for a 7199 reverb driverrecovery tube. The ga8t or the ga8t discoverer was based on the regular ga8 but with the addition of tremolo.
The gibson skylark is an underrated small amp from the late 50s and early. Your purchases help youth music programs get the gear they need to make music. See more ideas about vintage guitars, fender deluxe and black and white printer. Even if it is empty that it will be transplanted live on the sound system amplifier must be 12 or 15 watts max, playing the memphis blues of 50 with this amp is a joy. Ga 4re schematics ga 5 schematics ga 5 les paul jr schematics ga 5 reissue 2004 schematics ga 5 skylark schematics ga 5t schematics ga 5t skylark schematics hard to read ga 5w schematics ga 5wt schematics ga 5wtr schematics ga 6 lancer schematics ga 8 6bq5 schematics ga 8 6v6 schematics ga 8 gibsonette schematics ga 8 schematics ga 8t. Twint circuits with a computer software program called electronics workbench.
Dec 03, 2010 it just can scream some vintage rock n roll tones. Vintage 1960 gibson ga8t gibsonette discoverer amp. In march 18 i found a 1960 gibsonette on cl and fell in love with its thick, single ended antics. I purchased a gibson ga 5 skylark off ebay last week. The ga 20 was the first gibson amp to feature a top mounted, rear facing control panel, making it more user friendly than a rear bottom mounted chassis featured in previous models. Gibson made the ga20 in various configurations between 1950 and 61, with this twotone rendition in buffalograin with woven saran grille appearing from 54 to 59 the only real visual alterations in that span being the loss of the 20 from the front logo and changes in the input legends in the final two years. This new indie ampbuilder is aiming for highend sounds without using output valves. When the electric guitar emerged in the 1930s as an instrument with its own voice, gibson amplifiers powered that voice. I think it would make sense to figure which you gravitate toward. Anybody have any knowledge of or experience with this amp. Gibson diagrams, schematics and service manuals download for free. Farmhouse guitars, june 19, 2003 so mine is branded ga8t discoverer but has a 12 jensen, one 12ax7 pre, 2 ecl826bm8 and a 5y3 rectifier. The ga18t model took its place in 1961 thru 1963 and is nearly identical except that the ga18 has a 12 inch jensen alnico speaker while the ga18t has a 10 inch jensen alnico speaker.
Initial, it had a gold wrap which was replaced by tan in 1963 and then black in 1965. I purchased a gibson ga5 skylark off ebay last week. This amplifier is also noted for its nice compact luggage styling with a brown leatherette covering over a solid. Gibson ga 8t discoverer tremolo amplifier 6bm8version schematic contents. Prowess amplifiers offers resources for the guitar tube amplifier builder. Gibson schematic heaven, tube books, schematics galore. Gibson ga8t discoverer tremolo amplifier 6bm8version schematic contents. Amps for guitars, basses, keyboards and more for sale on reverb. Gibson high quality service manuals user owner instruction. This schme is valid for the ga 8t with the rearmounted controlsthe amp that preceded yours in gibson production. Old style snapin ac power inlet for gibson goldtonetrace. Ga 18ts are a very different sound as compared to the blackface fenders. Like other gibson amps, the ga8t changed in its covering material during its run. The 12ax7 tubes used in gibson ga6s and later fender champs like the 5e1 and the 5f1, distort a bit more, but keep those distortions in.
Ga 6 lancer ga 8 gibsonette ga 8t ga 9 ga 14 titan same as ga 6 ga 15 maestro ga 15rvt explorer ga 16t viscount ga 17rvt scout ga 18t explorer ga 19rvt falcon ga 20 ga 20t. Woody, as i said, gibson schematics are puzzles unto themselves. I have more than o ne source here with ga 8t schematics that show 6bm8s. Jun 26, 2014 they leave it clean, but warm and full.
In the 1940s and 1950s, gibsons continuing advances in. Hi all, just finished buidling a ga8t amp,gibson ga8t schematic service manual free download, schematics, eeprom, repair info for. Master guitar builder, ervin somogyi guitar connoisseur magazine. Ga18t musical instrument amplifier pdf manual download. The ga19rvt is the same circuit, but adds reverb, and uses 6eu7s and 6v6s. If you want to join us and get repairing help please sign in or sign up by completing a simple electrical test or write your question to the message board without registration. As the new owner of a gibson amplifier, you have joined a great gibson legacy. And 6sj7 tubes do that whether they are in a gibson les paul junior or a tweed fender champ fc1. An awful lot of electronics and software is still handled this way. Gibson ga5 reissue model schematic 2004 chasing tone. The 12ax7 tubes used in gibson ga 6s and later fender champs like the 5e1 and the 5f1, distort a bit more, but keep those distortions in the lowerorder harmonics.
Gibson ga15rvt schematic service manual download, schematics. The tweed discoverer is rather similar to a tweed fender deluxe except that a it has tremolo and b it uses 6bm8s which contain a triode and a pentode. Thanks for the info guysit seems that gibson made two versions of the ga8t discoverer amp. I love the gibson crestline amps and that looks to be a very clean specimen only thing i did to my reconditioned falcon ga 19 rvt was to source and install an original footswitch and replace the pyledriver speaker that someone had put in there somewhere along the way with a reconed 62 jensen. Gibson amp heaven schematics maestro skylark les paul. Schematics, introduction features, voltage check points, tube layout chart. Three instrument inputs all voiced alike go into one channel and a higher gain microphone input is used to great effect by guitarists who want a more overdriven. Most gibson amps from made from 1955 to 1965 can really deliver a great tone comparable to many classic fender models, but usually require some important. All of the guts were stripped by the prior owner leaving transformers, tube sockets, potsswitcheslamp, jacks, speaker and cab. The gibson is much more along the lines of a tweed fender.
It has the typical, tiny, gibson output transformer. This is based on the physical size, 4watt power, 8inch speaker and an. Jul 26, 2015 vintage late 50s gibson ga8 gibsonette twotone 10 guitar amp. Normally folded and mailed in ordinary business envelope. I examined the schematic and there was a difference in the chip in the input channel. Be aware that gibson is famous for using the same model designation for amps that can be quite different. Add a driver pedal to the front end for a little overload and wonderful sonic breakup begins to occur. Like other gibson amps, the ga 8t changed in its covering material during its run. The new tranny is a heyboer transformer designed for a marshall 18 watt clone project elsewhere on the web.
The 6bm8 is a cousin of the 6gw8 used by guild in the t1s and t1 rvts and has triode and pentode sections. I have an opportunity to pick up an early 1960s gibson ga8t discoverer tremolo, 15 watt 112 combo amp. Service manuals, schematics, eproms for electrical technicians. The smaller gif is pretty much just for use on a web page, but lets one see at a glance what the overall structure is. The caption says ga16t, but the schematic was identical for the ga18t. From fender, vox and marshall to boutique amp heads from dr. Ga18ts are a very different sound as compared to the blackface fenders.
Gibson consistently used undersized transformers on their guitar amps. Vintage late 50s gibson ga8 gibsonette twotone 10 guitar. I had always thought of gibson amps as pretty dark sounding and fender as the bright ones. View and download gibson ga18t schematic diagram online. The ga 8t or the ga 8t discoverer was based on the regular ga 8 but with the addition of tremolo. Sounds fantastic and is very original less some replaced caps. I am having a hard time finding any parts as this was built in 1971. Ga 18t musical instrument amplifier pdf manual download. Jun 26, 2014 the original schematic to this 1956 gibson ga5 les paul junior amp shows virtually the same circuit as a tweed fender champ fc1. The caption says ga 16t, but the schematic was identical for the ga 18t. After that, the jpeg is the best but also the biggest. This site helps you to save the earth from electronic waste. Nate westgor of willies american guitars in saint paul, minnesota, knows as much as anybody about vintage gear, and although the stores website says, cool used guitars is just about all we do, they also do quite a bit with cool used amps. We have a huge schematics inventory, projects section and forum.
The schematic at shematic heaven shows the same scheme i have. In total, gibson produced no fewer than five les paul ga40 amplifier variants. Cosmetically it is quite worn, but looks cool with a really cool handle. Even if it is empty that it will be transplanted live on the sound system amplifier must be 12 or 15 watts max, playing the memphi. Ga series gaversion 1 ga1rt maestro revecho ga1rvt ga2rvt ga3rv ga4re ga5 skylark. Gibson ga8t schematic service manual download, schematics. This schme is valid for the ga8t with the rearmounted controlsthe amp that preceded yours in gibson production. I recently got a gibson ga 5t skylark 5 watt amp and it also.
I have more than o ne source here with ga8t schematics that show 6bm8s. Gibson ga8t tube help vintage corner gibson brands forums. Gibson saturn turned out to be a great project amp that was a good foundation for. They have the minimum controls necessary to produce a good range of sounds, from clean to overdriven. There is no schematic i can find with this tube compliment, but only record of this being one of the correct compliments of tubes. In the middle of the video i move the volume knob from around 2clean to cranked all the way. One brand i hear this sort of question about a lot is gibson. The ga 19rvt is the same circuit, but adds reverb, and uses 6eu7s and 6v6s. Your purchases also help protect forests, including. Ga version 1 ga 1rt maestro revecho ga 1rvt ga 2rvt ga 3rv ga 4re ga 5 skylark. Orignial jensen speaker is coded 220105 dating to the 5th week of 1961. Gibson tube amp schematics, hoffman amps tube amp schematic library gibson schematics.
View and download gibson ga 18t schematic diagram online. This one really has a great tone, incredibly warm and full. Ga series ga version 1 ga 1rt maestro revecho ga 1rvt ga 2rvt ga 3rv ga 4re ga 5 skylark. Gibsonette ga8 inspired first build telecaster guitar forum. I have schematic and will likely rebuild it to the original spec, then mod it if i dont like it it doesnt appear to have the best rep for tone. The original schematic to this 1956 gibson ga5 les paul junior amp shows virtually the same circuit as a tweed fender champ fc1. Gibson ga5 les paul junior amplifier as the new owner of the les paul junior amplifier, you have joined a great gibson legacy. Ga 6 lancer ga 8 gibsonette ga 8t ga 9 ga 14 titan same as ga 6 ga 15 maestro ga 15rvt explorer ga 16t viscount ga 17rvt scout ga 18t explorer ga 19rvt falcon ga 20 ga 20t ga 20rvt minuteman ga 25 ga. The new tranny is a heyboer transformer designed for a marshall 18 watt clone project elsewhere on. The schematics from the two sources you two supplied have the early version schematics and only a picture of the late ga 8t, so im still looking.