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 1 
 on: July 19, 2017, 07:12:35 PM 
Started by ilyaa - Last post by ilyaa
just an update -

I ended up replacing every IC on the preamp - after a fiddly 'biamp crossover' pot that almost sent me back to square one - it was one of those 'everything works!' and then put in back in the chassis and nothing works again! - but luckily just a bad solder contact -

we are back in business!! I replaced the flimsy ribbon cable with individual stranded wires - time consuming but much more sturdy - and had to replace a couple broken send/return jacks on the back -

looks like there was something serious that happened to the +/- 15 rails because all of the op-amps were fried. but I've ran it for quite a while now and we seem to be back in business. I did replace the zeners and regulator transistors for the low voltage rails  - think those were the initial problem.

anyway, thanks guys! kind of a long saga but all's well that ends well

 2 
 on: July 18, 2017, 12:04:27 PM 
Started by Brunel98 - Last post by Brunel98
This is just to let you know that I haven't forgotten about this - circumstances have just got in the way and I have't been able to progress. As soon as I am able I'll take the readings and photos and post the results.

 3 
 on: July 16, 2017, 11:30:25 PM 
Started by thatguy - Last post by J M Fahey
*Forget*  the Yamaha distortion, donīt waste time on it and even better donīt risk hurting the amp, just use the meanest pedal you want in front of it.
Let the pedal do the drive and the Yamaha provide muscle ... which it has in spades.

 4 
 on: July 16, 2017, 11:43:26 AM 
Started by thatguy - Last post by semjmiyta
I know it's an old post but fer the helluv it my 2 cents. Ive had my G100 for 6-8 months $120out the door at a pawn shop. At 1st I couldnt get any good tones then I started stacking different pedals in front and........HOLY Sh**. Im using an Ibanez s series with Boss MT into the clean head.  FN" insane when you spend some time with the pedals dialing in small nuances really pay off.

Oh yeah and a buddy of ine calls me saying he found some speaker in an alley (actually 2 of em) and do I think I'd want it . Lansing something or other h says. Bring it over I said. $40 later I had a vintage 15" Lansing woofer. Built a quick box painted black And window screen over the front painted black. Really...outstanding. Thru fluke things that happen I have a killer setup.

Although I still feel the yamaha distortion really weak and foul sounding and despite what I've been told I do believe the head can be modded to fix that. I just don't have the exact knowledge of how to do this but in time.........in time.

 5 
 on: July 16, 2017, 01:24:38 AM 
Started by ilyaa - Last post by Enzo
They would probably be fine, just do not mix the types.

 6 
 on: July 15, 2017, 09:21:19 PM 
Started by ilyaa - Last post by ilyaa
any reason those ones i posted links to wouldn't be suitable replacements?


 7 
 on: July 15, 2017, 02:52:59 PM 
Started by ilyaa - Last post by DrGonz78
Try this out. It seems Digikey is now my go to for Sanken type transistors.

https://www.digikey.com/products/en?keywords=2sa1294

https://www.digikey.com/products/en?keywords=2sc3263

 8 
 on: July 15, 2017, 02:23:05 PM 
Started by ilyaa - Last post by ilyaa
sounds good!

im having a hard time sourcing the 2sa1294 and 2sc3263

are these okay replacements?

http://www.mouser.com/ProductDetail/Toshiba/2SA1943NS1ES/?qs=%2fha2pyFaduidnB2ikiWN6Mj%2fNiMyHui3NfG44QxZh5k%3d

http://www.mouser.com/ProductDetail/Toshiba/2SC5200-OQ/?qs=sGAEpiMZZMtQ1ytNl72Bk61bpVKF%252bR%252bC

 9 
 on: July 15, 2017, 09:45:29 AM 
Started by printer2 - Last post by printer2
I found the 5E3 thing with the bass control acting as the second volume control did not do anything major to the sound. I decided to go back to an earlier idea about using a 500k pot with a push pull switch to convert to a bass treble tone stack to a sort of Tweed tone control. I dropped it when I realized that the bass control can effect the operation if it is not set for maximum resistance. Since I had the circuit breadboarded I thought might as well see how much effect the bass  control had on it. I found the control increased or decreased the sensitivity of the tone control and did not seriously muck up the operation of the tone control. So I went for it and wired it up.

I also found I had different values in the amp as were on my earlier schematic. I updated the part values, still need to hook up the NFB. Actually a nice little package with the small cab and the 8" speaker. I am going to leave it as is for a while but I would like to see if I can push the voltage up to around 300V. Sorry for the big pictures again, still working things out since I dropped photobucket.








 10 
 on: July 13, 2017, 02:09:15 AM 
Started by joecool85 - Last post by DrGonz78
Funny thing is I had to call Fishman for a schematic recently too and it was just the fastest phone call ever. I love companies that support their products at the consumer level so the owner has options for independent repair. Makes ownership a privilege rather than an inevitable headache that comes with trying to repair something without the roadmap.

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