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Messages - dlbraly

#46
wow thats huge
sorry about that

Testing attachment size
#47
Try this again
#48
guess I need to shrink the photo sizes
#49
Amplifier Discussion / Re: parts
July 18, 2018, 08:33:06 PM
yes one of the bad transistors was TR206 or TR207

Whats written on the transistors in TR301 and TR301 is
(triangle) N
K127A
8..IN

#50
Amplifier Discussion / Yamaha G100-112 - Journey
July 18, 2018, 08:16:58 PM
This Yamaha had a think piece of plastic and some kind of thermal paste between a couple of the diodes and a big heat sink.

Do you just use CPU thermal paste?
They are mounted vertically, so if it was something runny it might run down the side.
#51
Amplifier Discussion / Re: parts
July 18, 2018, 09:55:59 AM
Yes - it is the Yamaha G100-112 first series amp.

Thanks for all the comments. Thanks you for being patient with me. I am new at that this and want to learn for a hobby. late in life to learn, but fun.
I will take a better look tonight when I get home.
BUT I'm pretty sure someone may have changed out the FET transistors on the MA board with a different ones. I took lots of pictures on my cell phone.
Looks like 2 on the MA Board are:
N
K127
8 .IN

transistors on the MA board looked backwards, so being different might explain that. the pin out might be different on those parts.

Yes the bad transistor found was on the DC board.

Problem - the amp was not amplifying the clean channel like you would expect a 100 watt amp. you would have to turn it up past 5 on the clean channel.
The distortion channel was even worse and sounded terrible. had to turn the distortion channel up to 10.

So far I have found some bad solder joints, the boards were caked with flux and grime, a 47k ceramic capacitor that reads 43, a cracked input jack, and that bad transistor 2SK30A on the DC board.

what I've done - I'm learning, I probably did not have to do all this. Fun hobby for me.
Ive been cleaning the boards with  isopropyl alcohol and a toothbrush, removing parts checking them on a LCR T4 tester, cleaning the hole if a drill bit, and putting them back on.

I'm at work, do you want to see pictures? I can post them when I get home.
#52
Amplifier Discussion / Re: parts
July 17, 2018, 10:50:51 PM
Let me rephrase that
Please teach me how to figure out a replacement part.
Do I look at data sheets?

quick google someone said 2n5457 - so I guess I need to compare data sheets on those.
#53
Amplifier Discussion / Re: parts
July 17, 2018, 10:28:51 PM
Is there a replacement transistor I could use instead of a 2SK30?

yeah I won't be using the one I linked.

#54
Amplifier Discussion / Re: parts
July 16, 2018, 10:53:26 PM
I did a search and did not see a post on places to get parts.
Is that a faux pas to ask on the forum?
#55
Amplifier Discussion / parts
July 16, 2018, 10:51:25 PM
What is your favorite website to order parts from?

I found some parts on utsource.net, but I was not ready to check out. I knew I wanted to get some more parts.
The next day they emailed me (copied email below). now Im afraid to purchase from them.
Seemed weird to me.



"
Dear my friend
Wish you have a nice day !
We noticed that you add the parts:2SK30A-GR etc.to shopping cart from our website ,but we still did not get your any payment ,May i know the reason ?

Could you please inform us when do you complete the payment ? We will arrange the shipment for you in advance, any questions pls mail us.

In order to have more cooperation,
If you are new customer, You get an opportunity to redeem $14 free shipping coupon.
"
#56
Number one answer, well I dont know about that vegan part.
Quote from: R.G. on June 26, 2018, 06:35:45 PM
@ OP: if you want to play guitar powered only by solar power, use an acoustic guitar and become a vegan.

I like the idea as well.

You could set up solar for 1 or 2 outlets in your home.
Plug your amp into it.

If your thinking more mobile, they have battery powered amps. You could get one of those portable solar powered chargers.
#57
Amplifier Discussion / A lot of information
July 15, 2018, 10:03:37 AM
WOW, a lot of information here.
Im currently reading the
Teemu Kyttälä
Solid-State Guitar Amplifiers
http://www.thatraymond.com/downloads/solidstate_guitar_amplifiers_teemu_kyttala_v1.0.pdf

figured Id read this after.
http://sound.whsites.net/beginners.htm

skim this forum see more as well.
#58
Amplifier Discussion / Re: Light Bulb Limiter
July 15, 2018, 09:45:49 AM
Here is the one I made.
I made a shorting plug as well, figured it would be easier to check to make sure the bulbs were good. Not much use if you have bad bulbs in it.

Only thing I purchased were the bulbs.
#59
Thanks, I kind of figured that out plugging the components into the LCR-T4 Tester.

That tester is pretty cool.
it tested the other 2SK30 just fine, but this one failed.

Attached the schematics


#60
yes, Im new and looking over the posts for how too links.
Most of them are dead links.