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Originally Posted by John A.

Man, I hate Stern's tone. But I love his playing. Makes listening to him kinda frustrating.
I agree with you that these amps sound awful.
(To be fair, I'm sure at least part of his problem is his pedalboard full of tone-sucking Boss stompboxes.)
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04-19-2016 12:35 PM
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I played one in a band in the mid '70's. As mentioned, it did weigh a ton. I used to push it around on a skate board.
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I think guitar players used to be made of sterner (hey mike!) stuff. Looking at a comparison of the big 115 g100 version and the Randall rg120 115 they both weigh in at 68 pounds and the models correspond in weight through the lines.... still a bit less than the corresponding Fenders. Peaveys of the time were just as heavy.
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On the series 3, the volume pot pulls for a mid boost.
Originally Posted by Cavalier
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I like my G100 112 so well I am thinking about having a guy make a head out of it to increase portability. Then set it on top of my EV 112 cab. It will never reach the compact size of todays amps but I really like the tone....and I can't find that anywhere. They are incredible amps and they are always cheap (at present). On a flip side, if you want to hear what an Evans sounds like, all my videos on youtube are an Evans.
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I thought I'd finally contribute to this thread about Yamaha G100 amps. Back in March of 2015, I purchased the Yamaha G100-112ii (circa 1980) previously owned by the OP (Frank aka FEP). See posts #45 and #81.
Frank had the amp serviced before the sale and I picked it up when I was visiting San Diego. It is a terrific sounding solid state amp. Nice clean tone, quiet, and it matches well with both my Yamaha AE1200S and Gibson L5 CES. The amp's provenance (i.e., single owner, location: California, forum member), working condition, and ridiculously reasonable price (including original cover and foot switch) made this purchase a no-brainer. I don't gig, so it is just a super practice amp.
FWIW, I play primarily through the LOW input and the B channel. I never use pedals and don't have a need for distortion. I'd be interested in other member's tone settings or discoveries for the G100.
I'm including a couple of pictures.
Teaser Alert: I liked the amp so much I continued to troll for other Yamaha G100s. More to come.
Cheers,
Joe
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Ugh I sold my G50-410 a few weeks ago and it's been killing me. I didn't want to but an impending move made it somewhat necessary. Cherish these if you have them, I'll be on the hunt for another one of these when space isn't at such a premium.
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I might have to keep an eye open for the G100 115. It has a 15" speaker which sounds interesting.
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I have a Thirty 112 that I gave to my stepson when he started playing. I had a Fifty 210 that I kept at a friends house for jamming. I sold it when he moved and I used it to fund a better guitar. Both are the earlier models before the "G" was added.
Superb amps. They can do everything. They beat Jazz Choruses in my eyes because of a fuller low-end. And they're cheap because they are hidden gems.
Love 'em.
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As I alluded to in my previous post (#111), I liked my G100-112ii so much that when I stumbled across a Yamaha G100-212ii (circa 1980) I couldn't resist. This one is also from California (Costa Mesa) and was sitting in a closet for 30+ years. It's about as clean as it gets and came with 2 foot switches and casters. A couple of the pots were crackly but a few turns of the knobs cleared up the problem. Another terrific solid state amp at a ridiculously low price.
Pictures included.
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Not long after picking up a Yamaha G100-212ii (see post #116), I ran across a Yamaha G100-115ii. According to the seller, it had not been played since 1996 (when his dad passed away). It is another "California Closet Queen". This one was located in Santa Barbara. Like the others it is quiet, clean, and I'm able to get a really nice jazz tone.
I know it is silly to have 3 of these (as they are essentially the same amp) but opportunities kept presenting themselves. Each one cost less than a night out with the wife and kids. They also strategically appeared around Xmas and a birthday.
I never imagined that when I read Frank's original post back in 2010 that I'd end up collecting these amps. But he was right, they are not only a bargain but terrific amps. And since I don't gig, the weight issue is moot.
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I had a G100 112 I dragged around for 25 years with never a problem - great jazz amp - loud clean headroom - very useful tone controls. Let it go during a period of consolidation. Totally recommend.
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Originally Posted by lawson-stone
That's the amp I had my last year in high school and first year in college. Sold it when I bought a Boogie. Played so many jazz festivals with that G100-210 and an ES-175 or Yamaha SA-2000 - even opened for Buddy Rich with the G100! I've always missed that amp.Last edited by MaxTwang; 09-03-2016 at 12:33 PM.
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Well I can't upload a pic, but I found a G-100 112 III at a flea market for $20.00! Replaced the speaker, not the original, with an Eminence. This sounds so AWESOME! Total invested after tech cleaned it, $105.80.
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I chatted with a forum member a bit about these amps and realized I should amend my flat response post. They can be set flat but in a way similar to Fenders as there is a midrange scoop and high highs. I'm attaching the series i and ii service manuals which show the frequency response curves as well as the frequency and range of the tone controls. Roll back the treble to where you need it, boost the mids and adjust the bass to taste- more thickens the sound overall, less is flat.
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Was on holiday and by chance checked craigslist [It's a problem] and chanced upon a G50-112ii for $125. I was second in line but the first person that came too look at it said it was too heavy so I scooped it up. It's like coming home, dialed in a satisfactory tone in about 30 seconds and off we go. I also def. prefer this setup to the 410 I sold a few months back so it's been great. Def scratched the itch I had for an amp and much cheaper than what I was looking into purchasing.
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Agreed - they are beautifully clean and dynamic and take pedals well. Tons of headroom.
Sent from my iPhone using Tapatalk Pro
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Just wanted to post that I've finally managed to scan the 8-page *Manual* for the G-100 v.II amp. (This is NOT the Service Manual although I do also have PDFs for all three G-100 versions of those if you need one.)
So, if anyone would like a copy of the manual, just PM me with your email address. Hope this helps! :-)
Larry
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Recently Purchased a Yamaha G100 head. I'm not finding much info online for this specific model it's just a G100 on the rear of the head it has 1 ou 2 : 4~8 ohms right below that it says 1 + 2 : 8~16 ohms
there are 2 input jacks labeled 1 and 2. It powers up but but I have no way of checking if the built in distortion , reverb and tremolo/vibrato or basically anything. I have 2 little fender bullet amps and a little crate amp the same size as the fender's. Height and speaker size. So is it safe that if any or all of the speakers have 4~8 ohms*Side question does 4~8 ohms mean that that jack will accommodate a 4 and/or a 8 ohm speaker? then I could wire up 1 or 2 of them just to hear the amp and test it out. I just don't want fry anything which I read somewhere wrong speaker ohm and or wiring will fry the trannie.
Cool site ,by the way, very informative which is why I'm here asking for advice. One last question and that is I also read You can't or should'nt use a guitar cable for a head to speaker cab cable .Is this a true statement?
Been more than 20 years since Ive owned any type of guitar head........so........uhmmm if anybody could shed any light on this I would very grateful I cant find a copy of an owners manual if anyone knows where that'd be great .
Thanks in advance to everyone
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I guess my question (another) is if I have an 8 ohm speaker I connect it to the 4~8 speaker jack so this is ok if my speaker is 8 ohm to connect? The wiring diagrams are for 2 speakers and up.Will I harm any thing by just wiring up 1 speaker if its the correct ohm?
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Are SS amps like this that are now 30-35 years old as quiet and hiss free, as recent SS? My other concern with 35 y/o electronics is the economics of repairs. SS is generally very difficult or impossible/cost prohibitive to repair; I don't worry about this when I buy new Cube, knowing it'll likely outlast my life, but if it's 35 years old already, it'll make me hesitate. Do I worry without need?
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That is fine for a SS amp. SS amps have a minimum number of ohms they want to see (usually 4, sometimes 2). Just don't go below it and you will be fine, although they produce more output watts when the speaker load is lower.
Originally Posted by Davej
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My series 1 Yamahas are as quiet or quieter than a new SS amp easily. I prefer them to the series 2 but you couldn't go wrong with either. I do have a G100 115 series 1 and the stock speaker is great. Clean, full range. cast aluminum basket and is rated well over the power generated. This combination was marketed to cover the clean reinforcement needs that came up. PA, sax, clean guitar, bass etc....
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That is fine for a SS amp. SS amps have a minimum number of ohms they want to see (usually 4, sometimes 2). Just don't go below it and you will be fine, although they produce more output watts when the speaker load is lower.
Thank you for your quick response and thats what I was hoping to hear. I've herd nothing but good things and high praise about these amps and I can't wait to judge for myself! thanks again



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