I have a friend who has this guitar amp. It's a 15 watt practice amp from the late 70s, I think. Some of the pots are shot.
I've been trying to find schematic or basically any other technical info on this amp on the web for a few hours, and I've gotten nowhere. I'm trying to find info on the volume/master volume pots at least. (Whether they're linear/log/etc.).
I'll have access to the amp in a few days and I can measure things for myself, but if anyone has any info on this little guy I'd sure appreciate it!
Thanks,
Yurk
I've been trying to find schematic or basically any other technical info on this amp on the web for a few hours, and I've gotten nowhere. I'm trying to find info on the volume/master volume pots at least. (Whether they're linear/log/etc.).
I'll have access to the amp in a few days and I can measure things for myself, but if anyone has any info on this little guy I'd sure appreciate it!
Thanks,
Yurk
Great little amp, nice nasty sound when dimed, decent reverb, and the wood case is attractive.
The 15W is AC power consumption. The G-5 is nominally a 5W amp, it puts out 7W@10%THD into 4 ohms. Start an Ebay search for the service manual, they come up every now and then, its only a few pages but its worthwhile having.
Bass,treble,volume, and master volume pots are shown as A25Kohm. The reverb pot is a B50K.
I have modded a couple of these for guitarists friends (and one for myself). I add battery backup so they can play portable or AC. Also, I have tried some circuit changes to get some more bass out of it. The stock coupling cap is 1000uF, if you go bigger you find that Yamaha got just about everything out of the stock speaker, you have to go to an extension cab with a better speaker for more.
Got a G-5 hooked to my laptop right now playing blues from koqx.
The 15W is AC power consumption. The G-5 is nominally a 5W amp, it puts out 7W@10%THD into 4 ohms. Start an Ebay search for the service manual, they come up every now and then, its only a few pages but its worthwhile having.
Bass,treble,volume, and master volume pots are shown as A25Kohm. The reverb pot is a B50K.
I have modded a couple of these for guitarists friends (and one for myself). I add battery backup so they can play portable or AC. Also, I have tried some circuit changes to get some more bass out of it. The stock coupling cap is 1000uF, if you go bigger you find that Yamaha got just about everything out of the stock speaker, you have to go to an extension cab with a better speaker for more.
Got a G-5 hooked to my laptop right now playing blues from koqx.
Thanks!!
That's exactly what I needed. He still hasn't brought it by, but now I can get the pots ordered for when he does.
Thanks again.
That's exactly what I needed. He still hasn't brought it by, but now I can get the pots ordered for when he does.
Thanks again.
With the basic GA 15 amp without any mods, what is the best speaker that I can put the sound out to? 8 inch / 12 inch?? How good is the sound?
That is a loaded question. The one single thing in ANY amplifier that affects the tone the most, is the speaker. And I have no idea what "best" means. You and I may have real different ideas about what sounds good. That applies to speakers, and to amps, let alone to combinations of them.
Ever play through one of those little battery powered amps the size of a pack of cigarettes? Tiny little speaker, low power. All you have to do is connect that little amp to a 4x12 cab, and WOW what a big sound it makes.
Peavey makes the very popular Classic 30 amp, with a single 12" speaker. They also make the Delta BLues amps, using the EXACT same circuit. Those amps come in your choice of one 15" or two 10" speakers. SO in essence, Peavey has made the same amp in 1x12", 2x10", and 1x15" speaker versions.
The simplest answer to your question is the speaker you like best is the best one to use.
Ever play through one of those little battery powered amps the size of a pack of cigarettes? Tiny little speaker, low power. All you have to do is connect that little amp to a 4x12 cab, and WOW what a big sound it makes.
Peavey makes the very popular Classic 30 amp, with a single 12" speaker. They also make the Delta BLues amps, using the EXACT same circuit. Those amps come in your choice of one 15" or two 10" speakers. SO in essence, Peavey has made the same amp in 1x12", 2x10", and 1x15" speaker versions.
The simplest answer to your question is the speaker you like best is the best one to use.
I just like the amp, and I dont want to blow up the amp by connecting a speaker that it cannot handle. That is my only concern.
The amp doesn't know what the speaker size is, only the impedance. Measure the resistance of the stock speaker and pick any speaker you want given that it has the same impedance as the stock one.
It will "handle" essentially any guitar speaker ever made. (*)
Try it into a Full Stack (eight 10-inch), it will be impressive. A two-12" speaker, like Fender Twin, will also give it full voice. Of course it is "bad economics" to use a $1000 speaker with a $5 amplifier (OK, $200 on reverb.com). But the $5 6-inch speaker it comes with does not do it justice, just made it easy to sell.
(*) OK, not my KENT "guitar amp"s speaker, which is a 4-inch and did not even stand the mighty One Watt of the Kent amp.
Try it into a Full Stack (eight 10-inch), it will be impressive. A two-12" speaker, like Fender Twin, will also give it full voice. Of course it is "bad economics" to use a $1000 speaker with a $5 amplifier (OK, $200 on reverb.com). But the $5 6-inch speaker it comes with does not do it justice, just made it easy to sell.
(*) OK, not my KENT "guitar amp"s speaker, which is a 4-inch and did not even stand the mighty One Watt of the Kent amp.
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