Yamaha G100-112-III

Please see the other reviews, because there's lots of stuff I don't use (line out; ext speaker). Recently bought this SS amp used on eBay. I think it was mfgd in the early '90s--different colored plastic caps on the knobs. Like medical equipment. Parametric EQ and presence controls are highly tweakable and have real impacts on the sounds the amp makes. Two-spring reverb. Sought this amp out for clean, warm jazz guitar sounds mentioned in other reviews. I have a Polytone Minibrute but it colors / "darkens" the tone and I wanted a cleaner sound for an Epi archtop (Emperor Regent) with a floating pickup (replacement Kent Armstrong). The Polytone made the Epi sound like an ES-175, which is cool unless you're looking for a more acoustic vibe. G100-112-III has a distortion channel, but I only play clean; has an effects loop w/ volume setting (on the back). Original Yamaha 12" speaker. The person who owned this amp before me used the (footswitchable) distortion since he had the settings marked in white paint. Sounded pretty bluesy when I tried it once. I've been using this amp for practice (at vol = 3-4 tops w/ guitar volume rolled off), but from experimenting I'd guess you could use it for medium-sized venues without miking. Stays clean for some time, but clips around vol = 8. Wish it had a three-prong plug; the plug on this well-used amp comes out of the wall easily no matter what--has a mind of its own, maybe misses it's old master? I had to rig up an extention cord to keep it powered up. All and all for a jazz guitar amp this one's a winner.

The earlier commentators are right: the clean sound is warm but not does not break up with a sharp attack (not exactly tube-like sound). The amp stays clean as you increase the volume up to around 8 on this particular amp. The one thing I'd add about the sound quality that hasn't been said before, I think, is that it really depends on the guitar. I can find a nice setting for the Epiphone, but then plug in a Gibson ES 165 on the same settings and it can sound pretty boxy and, well, just bad. Have to re-think the whole setting thing. That's not true with the Polytone (12" speaker), which makes all my archtops and semi-hollows sound about the same. Guess with the Yamaha you're hearing the guitar and the pickup; with the Polytone you're hearing the Polytone. Don't use distortion. The amp is quiet but sensitive to the instrument--some buzz depending on the pickup and wiring of the guitar. Hi-fi.

Works fine but I haven't had it long & I'm a little worried about it being an old amp. Looks like it's been banged around some. The power switch is a small, plastic piston push button in a plastic housing. It's worked so far and probably replaceable. At least the red light keeps coming on. Only one (metal) 1/4" input. Pretty heavy so I added casters. It's made out of 3/4" plywood and the speaker magnet looks heavy duty. Not sure what kind of covering was used. Not Tolex. My amp came to me w/o corners, so I installed some plastic jobs. The amp also came with a broken reverb. (Beware of eBay sellers' claims!) A replacement unit was easily found online and the replacement was easy: the same Acutronics (sp?) model for the amp it's still being manufactured and is used on some Fender Hot Rod amps. A couple of RCA plugs, tape the bag back closed, and you're good to go.

Haven't had occasion to even think about contacting Yamaha. May look on eBay for a wiring diagram just in case it needs repair.

Been playing a long time. If it got ripped off from my house I guess I'd have more worries than replacing this amp, but in time I'd look for another one. There don't seem to be many of this particular model out there on eBay. There seem to be more from the earlier generation and G100 heads, which may be more musically versitile. Earlier generation 212 models are also in fairly contant supply. But if you find a G100-112-III in good shape, particularly for $150-200, and you're a archtop player looking to amplify the acoustic sound of your guitar I'd say you could do a whole lot worse for the money. Sounds better than a Roland JC-120 in that it's not a boorish loud and doesn't hiss like that beast does. Louder than a Roland Cube 60 too, though without the modeling capabilities and DSP. Old School, but reliable Japanese Old School.

-my amp made was made in 1994? solid state amp

-has 2 channels (clean and dirty), one input ...each channel has eq and then there is a main eq and presence and reverb

-100watts, 12 inch speaker

-effects loop, 2 powered outputs (one for the 12', and another one for connecting additional speakers if you want), also one direct out (non powered output), footswitch option (for switching between channels), headphone input

-I use this amp in my home, and it is plenty loud.....in fact i only put it quarter of the way, ..and it's probably even too loud then

..as far as features on an amp, i am a minimalist, ...less is more. nonetheless this amp has many extra decent features which comes in handy such as decent reverb and eq and extra powered outs and such

-i use a schecter c-1elite with this amp (has 2 humbuckers)

-this speaker suits my sonic expectations just fine. It has a really clean sound to it and a very present bass sound, but not harsh. Just right. Good for those who like clean, smooth sounding electric guitar sounds, ...add a chorus pedal and use the onboard reverb on the amp, ..and you'll have a really beutiful sound, ...great for jazz and christian stuff

- i can make this amp sound like all the various shades of clean pure warm electric guitar sounds, ...it's not harsh, ..but has just the right attitude

-don't use the dirty channel for playing crunchy stuff or even leads, ..it's not up to par. If you want to dirty up your sound, use the clean channel and then add pedals to make it distort. The distortion on the unit itself is not so great. Dont' buy the unit for the distortion, ..buy it for the natural warm clean sounding quality it has. for this, it does a great job

it's over 10 years old already, and it still looks and plays great. I would never use anything ideally without a backup, ..but this amp looks solid.

don't know

I have been playing the guitar for over 7 years. As far as electric, I own a Schecter C-1elite guitar and I play mostly christian p/w. I have a pretty good idea of the guitar amplifier landscape. Although personally, i've only owned a peavey backstage practice amp prior to this amp. I would say that this particular yamaha amp is ideal for people into jazz, christian, ..etc, ...It has a very natural balanced and clean sound.

One thing i don't like about it is that it's a bit on the heavy side, which makes it a bit of a burden to transport from home to trunk to gig etc..but it's manageable

The only other speaker which i considered getting was the Marshall MG250dx, ..but i noticed that when you took the effects off, the marshall did not have a natural sound to it, ..but on the contrary it sounded compressed and nasal compared to this yamaha, even though the yamaha is over 10 years old. This yamaha didn't have the million digital effects the marshall had, but the core basic sound was decent. You can always add whatever effects you desire later as an add-on. In addition, one feature i love about this speaker is that you can add extra speaker cabs to the unit because it has a powered out which comes straight from the 100 watt amp. pretty cool.. Overall, I am very pleased with this purchase and looking forward to using this many years for practicing and monitoring for live gigs. If it was lost or stolen, i would try to find the same speaker in the same condition for the same price, ..because it's worth it.

Produced in the Mid 80's, Known as " The Jazz Amp" for its clean tone and bottom end. It features a true two channel seperation via foot switch and from the control panel. The distortion needs much to be desired but its sports effect pedels either through its input or effects loop. Plenty loud and can drive a pair of marshall 4X12 very well. This no doubt the best solid state guitar amp made.

Either single pole or humbuckers can find there setting with this amp. It was Made for Jazz but can handle other venues buy shapping the tone with pedles or samplers. The clean channel is its best feature and can create a bottom end that matches your more pricey tube amp.

I own two, one purchased new in 1989 and works perfect to this day. The other off EBay two years ago, cleaned the pots up and the amp works and sounds great.

Very helpfull in helping me obtain a owner manuel for another Yamaha Product.

I have Played guitars for almost 40 years but to listen to me play you would wounder. This amp is my staple, I owned Marshalls,Ampegs and Fenders, I buy and sell , but the Yamaha will stay. Even true blue tube amp people will admit its sounds good.