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Sansui Au919 Parts

I see what ya mean, & understand that it needs to be safe & reliable. The tricky part to using cut off leads, would be reliably attaching them to the leads of the transistors. Maybe with hemostats, or another small clamping device (to keep things in the right position) , you could solder them together, or possibly use a good conductive glue/epoxy, if it exists? Just brainstorming a little, if these ideas don't sound right, maybe they'll nudge your mind in the right direction. ;) I'm confident you'll get a good solution figured out. :thmbsp:
 
rats

I've been watching this and hoping for a nice, easy outcome. Darn. EW, I agree it looks like a chore to redo all the output sockets!! Spaceman, if soldering round leads on didn't work, maybe one could use a small hammer and anvil to round out the square leads. That sounds like a PITA, but if I try it I'll let you all know the results.

Also a PITA, perhaps one could take a solid wires to match the original round leads' diameter, solder them onto the trimmed TO-3P leads, and insert them into the sockets. It wouldn't look too great, but if you left some insulation on them, it could be a viable long-term solution. What do you all think?

Edit: those leads would be 18-ga wire equivalent, by my reckoning with the datasheet.

Collin
 
I just want to chime in here...for it is MY AU-919 that is the bane of EW's existence...and all that I can tell the loyal AK readerdom is that Glenn is doing everything imaginable to undo the nightmare that this amp turned out to be. While I was excited about the possibility of this TO-3P(N) solution, I certainly understand the decision that was made.

It was my (and Glenn's) hope that this would be a good project to learn a few things...and perhaps share them with the AK community. I will certainly let everyone know what the finished product sounds like!
 
Clipping the stock TO-3P(N) leads off and soldering something on that fits in the socket might work, but I can't think of a way to do it reliably and consistantly (eight transistors and sixteen leads to modify).

I'll attempt to perform some tests on the amp once it is finished to see how the slow On-Semi affect its high-frequency performance.
 
Yeah, it all sounds pretty tedious. It's one thing for me to do it on my own time, but bebopdeluxe is waiting for his amp! We did all learn that it's not as simple as EW hoped for. The On-semis sound passible at the very least, so I'm very curious to see how EW's test turns out. What a great forum. :thmbsp:

Collin
 
noveltone:

I don't think the issue is as much my waiting for my amp as it is EW wanting to get it off his bench...

:D

It is not central to this thread, but the TO-3 issue is only one issue for Glenn to deal with here. This was a COMPLETELY bastardized amp - the victim of some of the shoddiest tech work that he had EVER seen. Not only is it becoming virtually a complete rebuild, but the process of undoing the prior work is a source of never-ending wonderment. While it would be nice to get the amp as close to its original operational specs as possible, there is a line - on some level - that needs to be drawn...and the decision to go with the On Semi TO-3's is one of those decisions.

I am confident that - even with the On Semi's - this is an amp that will sound DRAMATICALLY different when I get it back from Glenn. In the spirit of this forum, I was hoping that Glenn would be able to pass one or two things on to the AK community during the process...which is always a good thing...
 
It sounds like these transistors are the beginning of your and EW's headaches! I think its so great that EW will take on these projects. Lots of people like the vintage amps but I had a heck of a time finding anyone in my area who would look at my 919 or take even a professional level of care if they did, let alone the EchoWars happy ending.

Best of luck on your journey

Nikomi, have you found your transistors????

Collin
 
HI to everyone!

Yesterday transistors arrived!!! I found another change on right channel. 2SA992 has changed to 2SA970! I want to take transistors from HEAD AMPLIFIER BOARD F-2835.There are 2SA992, 2SC2071, 2SA939......(I don`t use turntable). I gave an order from http://www.sh-semiconductor.com for 2SD382 and 2SB537 and waiting for that.....When it arrive I will have original parts exept output transistors!
 
My SANSUI sounds perfectly now! There are more details in sound, and low frequencies sounds better! THANKS TO ALL!!!!!!!!!!
 
Well, I finished the amp, made it look pretty to boot, and shipped it back to Mr. Bebop himself. Per his last email, he seems pretty pleased with the outcome. If he would like to chime in, that would be preferred to my putting words into his mouth.
 
Yeah...what EW said...

:banana:

I certainly do not need to tell AK'ers about the quality of Glenn's work - his rep speaks for itself. When this process started, I had NO idea how much work this unit needed (and that was even before the "peanuts" incident...BTW, Glenn, I can't even tell where the shipping damage was! And I am keeping the box/packing materials you returned it with fo' sure...).

Neither did Glenn.

But his dogged determination to get things "right" made all the difference to me. If the OnSemi decision had ANY impact on the performance of the unit, I certainly can't tell...the sound is wonderful! One example that I gave Glenn that I will share with you...one of the first things I listened to was the CD of Little Feat's "Waiting For Columbus" (a fine compilation of their stuff that is also pretty well recorded...with lots of things to listen to...the bass line...the percussion...a good disc for listening to "spacing" and soundstage, IMO)...after "Join The Band", the first real song on the disc is "Fat Man In The Bathtub"...for those of you familiar with the recording, after the instrumental break in the middle, the verse comes back...and after Lowell George sings the line, "runnin' down the street yellin' at the top of his lungs...", there is a background baritone vocal that sings (almost on top of him), "ohhhh yea-h-h-h..."

It's hard to describe if you don't know the passage...but is just sounds SO sweet. Clear. Full of nuance. It's the kind of thing that we all focus on when we hear a better quality recording or hear a song on upgraded gear...and it's moments like that where we appreciate that step-function of quality of sound...

And it's ALL there.

The phono stage sounds great as well (which was extremely important to me as the AU-919 is the engine of this vinyl-centric system). If anything, the one thing that Glenn's work did was take the sound of this unit (which I have been told lends itself to an uncolored, flat, ACCURATE rendering of the music) and amped it up on steriods. The Ohm Walsh's - while great speakers for what they do - are not exactly low-frequency monsters, and when coupled with the unfailing preciseness, clarity and lack of tone adjustments (what - you mean that you don't just bypass the tone controls? LOL...), I am giving serious consideration to adding a Hsu sub just to give the system a little low-end rump...

And cosmetically? Glenn painted and baked the cover. Looks like new.

Everything about this process, from the initial rceipt of the amp (erk) to the constant flow of info as Glenn peeled back the layers of crap that kept coming...and coming...and coming...was VERY much appreciated. I hope that I never have to send anything to Glenn like this again...but it is good to know that if I had to have something like this fixed in the future, that I have a place to take it. As members of this forum surely know, Glenn is simply aces to deal with, and I hope to find the opportunity to buy him a beer sometime "further on down the road..."

Bill
 
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Bebop,
That is a wonderfully eloquent tribute to EW and his work.

AK is lucky to have him around.

John
 
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Nice description.....glad you are happy with it. I am on the lookout for a 919 since I have never heard one yet heard so much about them.
 
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