Yamaha Amps

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Re: Yamaha Amps

Unread post by Saul » Mon Jul 09, 2018 2:11 pm

Asmikace wrote:
Mon Jul 09, 2018 2:02 pm
The only problem was trying to decide between it, the 10C and 10X as I love a classic sounding amp but like to play a metal sound as well.
I would say that is just about the only thing wrong with the whole THR range. You should not have to choose between them. They are all the same amp it is just the installed software that makes them different. Yamaha COULD have put everything in one box but that probably would not have kept the accountants happy.

Still, congrats on the purchase. There is no doubting they are great little amps :)
Saul
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Re: Yamaha Amps

Unread post by Buzzard » Mon Jul 09, 2018 2:47 pm

Asmikace wrote:
Mon Jul 09, 2018 2:02 pm
I just got a THR 10 with carry case the other day with an Ebay coupon.
I am very impress with sound quality, effects, and portability especially with the optional battery.
The only problem was trying to decide between it, the 10C and 10X as I love a classic sounding amp but like to play a metal sound as well.
No worries there, the (standard off white) THR-10 can do metal too, it's the all rounder.
If you jump to our THR patch download page, I'm sure you'll find something you can use or modify to your needs.
Go get 'em here: :idea: viewtopic.php?f=135&t=9613 :idea:

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Peter
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Re: Yamaha Amps

Unread post by cerb » Tue Jul 10, 2018 9:33 am

For those ultra high gain meral needs, I've found that the THR series take pedals quite well.
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Re: Yamaha Amps

Unread post by Buzzard » Tue Jul 10, 2018 10:08 am

cerb wrote:
Tue Jul 10, 2018 9:33 am
For those ultra high gain meral needs, I've found that the THR series take pedals quite well.
You're absolutely right, THR amps work well with most pedals. :wink:
A booster/overdrive/distortion/fuzz pedal can take the THR amp over the top, and beyond.
Since most electric guitar players own at least one drive pedal, this is a great way to get metal sounds.

If a THR owner posts about their amp NOT telling if they have other effects,
I try to make do with what the THR is capable of as a stand alone amp/effects unit.

Regards
Peter
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Re: Yamaha Amps

Unread post by Mimasu » Sun Nov 11, 2018 3:10 pm

Any of you guys have a G50 112 (first series) service manual or pcb lay out? I do have the schematics.

Leon

BTW: weird thing. I got some much older solid state Yamaha amps. No problems with capacitors there (yet). In this G50 112 some electrolytic capacitors were very bad.
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Re: Yamaha Amps

Unread post by Buzzard » Sun Nov 11, 2018 3:54 pm

Uploading what I've got at the moment.
a.jpg
b.jpg
c.jpg

Da9dyamaha-g50-112-e-manual-by-download-mauritron-257082.jpg
Da9dyamaha-g50-112-e-manual-by-download-mauritron-257082.jpg (64.15 KiB) Viewed 815 times
yamaha_g50-112_guitar_amplifier_sch_pdf_1.png

yamaha_g50-112_pcb_adjustments.pdf
(1.13 MiB) Downloaded 24 times

yamaha_g50-112_guitar_amplifier_sch.pdf
(65.33 KiB) Downloaded 25 times
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Re: Yamaha Amps

Unread post by Mimasu » Sun Nov 11, 2018 4:32 pm

Thanks,

None of that looks like my preamp PCB I'm afraid :( .

I clearly have a problem in the preamp. Changed some bad leaking electrolytic capacitors, but that didn't solve the problem till now. Working through the tone stack now.

I bought this one becourse of the great cosmetic condition, but it has cost me a few evenings already to fix the problem.

But who cares, repairing old Yamaha's is a hobby too :?

Leon
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Re: Yamaha Amps

Unread post by bobmarlex » Sun Dec 23, 2018 11:56 pm

hi,
@buzzard
Thank you very much for sharing your fine palette of yamaha products.
This Thread is impressive. Never believed that they build such fine things..even the artwork is amazing.
That leads me to my question: today in the bandroom i had contact with a 'very old yamaha G50-112 II'. We cleant up the room and suddenly 'there she was'...
Certainly i had to plug in a guitar into this really 'fuckedup roadworn unit' ...and was blasted. A fancy Truetone sound with a crisp tight habit...
Now its at my home....

The amp is in a really bad condition but it works dispite of crackling potis or a broken case.... :/:
The Reverb seems to have really trouble because of many 'twangs' along the play...
Any Suggestions in refurbishing this amp would be greatly appriciated. Thanks again.

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Please feel free to move this reply, whereever you think its better filed.
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Re: Yamaha Amps

Unread post by Buzzard » Mon Dec 24, 2018 11:46 am

Hi bobmarlex, welcome to the forum and the string section. :D

The G-mark 2 amps have a great reputation for their clean sounds
I recommend a gentle restoration/refurbishing repairing only what really needs to be done to get the sound back.
You'll need a contact cleaner spray to get rid of the crackles of your pots.
Here's a guide to clean pots: viewtopic.php?f=123&t=9039
PLEASE REMEMBER to let ALL the spray fluid evaporate before plugging in and testing,
because the liquid is highly flammable.

More G-50 II including schematics: viewtopic.php?f=134&t=7006#p34155

To shine up the tolex on the cabinet use a vinyl restorer spray (silicone).

BTW. I'm not sure that the speaker in your cabinet is original, but if it sounds good just leave it in.
Original speakers can be found second hand online from G-50 112 II and G-100 212 II .

Best Regards
Peter
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Re: Yamaha Amps

Unread post by bobmarlex » Tue Dec 25, 2018 2:28 pm

Hi Peter, thanks for reply.
This morning family went to church and left me at home with 'a little cold'. My chance.... :dance:
Done:
unmounted the removeable case-parts (incl. pre-cleaning)
unmounted the PCB (incl. knob-cleaning)
removed the reverb-section and visually checked it (seems to be physically ok)

The speaker definitly was changed...-but sounds nice. A printmark shows the following: GH1 X T2320, no labels, nothing else.
This amp had a heavy accident, resulting in a cracked case at the upper right corner; maybe the original speaker collapsed due to this issue...

This is the state:

By the way: Merry Swingin' Chistmas..!
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Re: Yamaha Amps

Unread post by Buzzard » Wed Dec 26, 2018 10:24 pm

bobmarlex wrote:
Tue Dec 25, 2018 2:28 pm
This amp had a heavy accident, resulting in a cracked case at the upper right corner
Hi bob, is the amp working ?

The cabinet can easily be fixed, the woodwork may take some time, but can be done with some wood, glue and a few screws.

Let's know how it's coming along.

Regards
Peter
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Re: Yamaha Amps

Unread post by Mimasu » Thu Dec 27, 2018 12:15 am

bobmarlex wrote:
Tue Dec 25, 2018 2:28 pm
The speaker definitly was changed...-but sounds nice. A printmark shows the following: GH1 X T2320, no labels, nothing else.
Looks like a Celestion code to me. The code doesn't appear on the known Celestion lists. Somewhere on the web it's mentioned as the intermediate speaker between the late 70s H30 and the early 80s G12-65. The page that is referred to is not longer online I'm afraid. There is one on the web that came out of an eary 70'ies HH combo.

So my best guess: an early 70'ies Celestion made guitar speaker. So no need to change that one 8) .

Leon
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Re: Yamaha Amps

Unread post by bobmarlex » Sun Dec 30, 2018 12:30 am

yes, the amp sounds very nice in cleanarea, the distortion section seems to have been blasted off a decade before: the 'LEVEL' of the PARAMETRIC EQ' section shall not be moved under any circumstances...bad weather....
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Re: Yamaha Amps

Unread post by Buzzard » Sun Dec 30, 2018 1:26 am

bobmarlex wrote:
Sun Dec 30, 2018 12:30 am
yes, the amp sounds very nice in cleanarea, the distortion section seems to have been blasted off a decade before: the 'LEVEL' of the PARAMETRIC EQ' section shall not be moved under any circumstances...bad weather....
The distortion (on most G models) isn't very powerful, almost like a mild overdrive.
To get proper good distortion, use a good distortion or overdrive pedal.

If the level of the parametric equalizer gives some heavy thunder crashes, clean and exercise the pot A LOT,
that will usually cure the loud scratchy noises.

Regards
Peter
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Re: Yamaha Amps

Unread post by bobmarlex » Sun Dec 30, 2018 6:34 pm

Buzzard wrote:
Sun Dec 30, 2018 1:26 am
bobmarlex wrote:
Sun Dec 30, 2018 12:30 am
yes, the amp sounds very nice in cleanarea, the distortion section seems to have been blasted off a decade before: the 'LEVEL' of the PARAMETRIC EQ' section shall not be moved under any circumstances...bad weather....
The distortion (on most G models) isn't very powerful, almost like a mild overdrive.
To get proper good distortion, use a good distortion or overdrive pedal.

If the level of the parametric equalizer gives some heavy thunder crashes, clean and exercise the pot A LOT,
that will usually cure the loud scratchy noises.

Regards
Peter
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..
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