Yamaha Amps

Moderators: Derek, Buzzard, parametric, Saul

User avatar
Buzzard
Specialist Moderator
Specialist Moderator
Posts: 2805
Joined: Wed Sep 04, 2013 7:38 pm
Location.: Denmark
Contact:

Re: Yamaha Amps

Unread post by Buzzard »

bobmarlex wrote:
Sun Dec 30, 2018 6:34 pm
hi Peter,
right: it only gives heavy crashes in both directions, so i thought/think the electronic circuit is damaged. Didn't use it at the first experiences (used a Korg AX1500G multiFX)...
you mean it's just the pot and 'flooding' it more than one time with contact-cleaner will help? That would be great..
Yes, soak the pot with cleaning fluid, and exercise it by turning it up and down about 50 times to release dirt on the coal tracks.
With a bit of luck, that will remove the thunder crashes. (your circuits should be fine.)

Regards
Peter


Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:

User avatar
EW Repair
Posts: 2
Joined: Tue May 21, 2019 3:43 am

Re: Yamaha Amps

Unread post by EW Repair »

Great collection and pics. I am currently working on a TA-60 and need a good close up picture of the reverb double pot. The upper mount flange came loose most likely due to trying to remove a stubborn knob. this resulted in a wobbly double pot bouncing around for years. With the exception of the jumper on the bottom pot and the orange wire on the center tab of the top pot, everything else has broken off. The schematics are vague on what color wire goes where...so can you help me out?



User avatar
rgilbert8
Posts: 1
Joined: Mon Dec 09, 2019 6:09 pm

Re: Yamaha Amps

Unread post by rgilbert8 »

Hello I'm new here so forgive me if I do it wrong. I just bought a G 50 that sounds great for about a half an hour and then it seems to loose power or fade/cut out. I went through and cleaned everything, rewire the speaker but it still seems to do it. I'm wondering if I should replace those silver caps/diode's, that are hangin' there like tubes,[not sure wat to call em] Saw one fella said something about the cap, not very good. so being such an old amp is that something I should think about replacing?but just wondered if anybody else had that problem.thx.
JereFuzz wrote:
Sat Dec 26, 2015 4:40 pm
Buzzard wrote:
JereFuzz wrote:I bought a G50-112 basically on looks alone.
The sound is quite nice but the distortion is a bit limited. Regards ...
Hi JereFuzz , Welcome to the Yamaha Forums. :D

Most of the amps in the "G" series have a fairly weak distortion, more like an overdrive.
If you use a guitar with high output humbuckers, you'll have distortion, but no metal.
The "G" amps work well with pedals, and they are generally quite loud.

Best Regards
Peter
Thanks for the info. With Yamaha's renewed commitment to guitars (Revstar) hopefully this translate to a new commitment to amps. I'm in the market for a Revstar and I would be in the market for a new Yamaha amp if they can nail down the aesthetic.

Regards ...



User avatar
Buzzard
Specialist Moderator
Specialist Moderator
Posts: 2805
Joined: Wed Sep 04, 2013 7:38 pm
Location.: Denmark
Contact:

Re: Yamaha Amps

Unread post by Buzzard »

rgilbert8 wrote:
Mon Dec 09, 2019 6:39 pm
Hello I'm new here so forgive me if I do it wrong. I just bought a G 50 that sounds great for about a half an hour and then it seems to loose power or fade/cut out. I went through and cleaned everything, rewire the speaker but it still seems to do it. I'm wondering if I should replace those silver caps/diode's, that are hangin' there like tubes,[not sure wat to call em] Saw one fella said something about the cap, not very good. so being such an old amp is that something I should think about replacing? but just wondered if anybody else had that problem.thx.
Welcome to the forum and the string section. :D

It may very well be your capacitors failing after years of good service.
Your replacements may be smaller in size, but the specs (uf/pf) must be the same.
The voltage for the capacitors may be higher (never lower) than the originals.
Changing them takes a bit of time, and you need to be able to solder to do the job
The parts are relatively cheap, you can find them at most electronics pushers, local or online.

Let's know how you get on, the amp is totally worth getting back to shape.
A few pictures will help us help you too.

Best Regards
Peter


Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:

User avatar
Buzzard
Specialist Moderator
Specialist Moderator
Posts: 2805
Joined: Wed Sep 04, 2013 7:38 pm
Location.: Denmark
Contact:

Re: Yamaha Amps

Unread post by Buzzard »

EW Repair wrote:
Tue May 21, 2019 4:14 am
Great collection and pics. I am currently working on a TA-60 and need a good close up picture of the reverb double pot. The upper mount flange came loose most likely due to trying to remove a stubborn knob. this resulted in a wobbly double pot bouncing around for years. With the exception of the jumper on the bottom pot and the orange wire on the center tab of the top pot, everything else has broken off. The schematics are vague on what color wire goes where...so can you help me out?
Welcome to the forum and the string section. :D … somewhat delayed, sorry.

If you haven't solved the problem yet, show us some snaps of the bits/parts in question,
and we'll try to help you out.
yamahata60backhshp.jpg
My TA-60 was sold some years ago, but my TA collection now includes: TA-30 , TA-70 , TA-90 and TA-120.

Best Regards
Peter
You must be registered and a VIP subscriber to view the files attached to this post. Click here for more info.


Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:

User avatar
Rolls-Royce
Posts: 1
Joined: Tue Dec 10, 2019 11:58 pm

Re: Yamaha Amps

Unread post by Rolls-Royce »

Hi all. Writing to you from Belgium, Europe.

I've had a Yamaha GA15II (15Watt) guitar amplifier for quite a while now but never really used it much. Today i finally tried it out but once i hooked up the guitar, it did not generate any noise. Power is on, when guitar is not hooked up and i turn the volume up i get the buzzing noise so the amp is working just fine. The problem surely must be with the input jack. I've done some internet-research on it and i will be opening the amp tomorrow for some closer investigation. As far as i understood with jacks its either a bad contact ( can be fixed with screwdriver by adjusting and pushing up towards the contact point ) OR i will need to buy a new input jack for the amp.
My question is are these type of jacks regular and can they be bought in a regular electricity store? If not, is there a a shop on the internet in Europe which sells these type of parts and delivers on the doorstep?

Thank u,
Bosh



User avatar
Buzzard
Specialist Moderator
Specialist Moderator
Posts: 2805
Joined: Wed Sep 04, 2013 7:38 pm
Location.: Denmark
Contact:

Re: Yamaha Amps

Unread post by Buzzard »

Rolls-Royce wrote:
Wed Dec 11, 2019 12:16 am
Hi all. Writing to you from Belgium, Europe.

I've had a Yamaha GA15II (15Watt) guitar amplifier for quite a while now but never really used it much. Today i finally tried it out but once i hooked up the guitar, it did not generate any noise. Power is on, when guitar is not hooked up and i turn the volume up i get the buzzing noise so the amp is working just fine. The problem surely must be with the input jack. I've done some internet-research on it and i will be opening the amp tomorrow for some closer investigation. As far as i understood with jacks its either a bad contact ( can be fixed with screwdriver by adjusting and pushing up towards the contact point ) OR i will need to buy a new input jack for the amp.
My question is are these type of jacks regular and can they be bought in a regular electricity store? If not, is there a a shop on the internet in Europe which sells these type of parts and delivers on the doorstep?

Thank u,
Bosh
Hi Bosh, welcome to the forum and the string section. :D

Your amp input sockets are likely to have coroded rings.
Clean the rings or replace the sockets with new ones.
You can find them in just about any electronics or music store.

Best Regards

Peter


Yamaholic, Guitars, Amps and Bikes. :idea: My Guitars: http://www.yamahamusicians.com/forum/vi ... =24&t=7004 :idea:

Post Reply