This was a bad day:(

My tube preamp was having a problem (it is hooked up to my SA 8800 II as the power amp). Anyway, I plugged the jumpers back into the Pioneer while the amp was on (stupid) and there was a small pop in the right speaker and now the right channel is out. It was working before and now it is out. I looked inside at the only 2 fuses I could see and they are okay. What could I have done? It this amp history? Is there any other fuses I can't see that I might have missed? Please help. I really hate to think that this amp has been around for 25 years working fine and now an idiot like me comes along and poop:( Any ideas, suggestions?

Thanks

The left channel IS making sound? NO protection circuit trip?

The database doesn't have a sa-8800 II manual....

WHICH inputs was it plugged into?? (this is very important).

Just spitballing here:
If the protection circuit isn't disconnecting the speakers, the fault is probably in the "preamp" circuits that do the volume, balance, loudness and tone functions. That is, IF you didn't connect directly to the power amp in jacks of the pre-out power in pairs...

and also, WHAT type of problem was the tube unit having?

...That is, IF you didn't connect directly to the power amp in jacks of the pre-out power in pairs...



I think thats exactly what he did do :scratch2:

I think thats exactly what he did do :scratch2:

If he did, I would expect the protection circuit to be engaged.

Basing this on the sa-8800 NOT the 8800II there are power-limiter circuits in the power amp that should have protected it. There is little (one exception) that can be done from the power amp input to silence it without engaging the protection circuit which would silence other channel at the same time.

that should have protected itYou are giving these circuits much more credit than they deserve (or are capable of).

The amp is likely blown. Yes, it can be repaired, but I think it uses those Über-rare output transistors that look like TO-220's with a mounting tab on the L and R instead of one on the top.

Well, let's hope that he didn't....

Maybe if he used the aux or tuner in, he fried the inline input resistors...

This is a replacement / substitution thread for a sa-8500II which MAY be close... (http://audiokarma.org/forums/showthread.php?t=98733)

RE: those transistors...

Enter some mechanical engineering, a retainer bar that matched the sockets, and would hold down TO-220 transistors, in this case good old ON-SEMI MJE15032 and MJE15033 's. To get the collector connection, there is a LUG LOCKING TINNED#4 terminal attached to the center of the retainer with a 4-40 screw, and the collector lead is bent up into the terminal and soldered to it AFTER the transistor is securely mounted (to avoid strain on the lead). The base and emitter connections are still made through the socket.

THUS with this bar THERE ARE NO MODIFICATIONS DONE to the original heatsinks, unlike in this other thread. The bar is 1/8 inch thick aluminum 1.100 x 0.500 with 2 holes to match the original (horrid little) 2sb617a & 2sd587 's and a tapped hole in the center for the solder lug.



http://audiokarma.org/forums/attachment.php?attachmentid=42345&d=1173425481

Rather than fabricate a new hold-down, why not remove the plastic case from the original transistor, and use the tab and heat spreader? Pop a center hole in it with a drill, and you're stylin'.

Edit: Actually, the center hole is problematic because of the 'thinness' of the original transistor tab. But there's a solution to this too...just connect the collector to one of the side screws, OR...if you can chip the remains of the old silicon from the heat spreader, solder directly to it.

:scratch2: :dunno:

Short version. I am an idiot!

Long version. The pre-amp does have a problem with the right channel. It is on the middle shelf, the Pioneer is on the bottom and the TT is on the top shelf. As I was fiddling with the preamp I caused the whole shelving unit to fall on me!:( That made everything to get hit or fall on the floor. I caught the TT but it made the cartridge go a little out of whack, I didn't know it at the time. After I set everything back up I tried everything through the preamp again, no change the right channel was out:( I hooked the TT and cd (actually an old dvd player) directly into the Pioneer. I figured out that I plugged the right channel of the dvd player into the video plug, so of course the right channel seemed to be "out" and the TT cartridge was not secure which also made the right channel go out. As I was laying in bed that night I thought about the possible problems. This morning I figured it all out. Such a strange coincidence that both of my problems were with the right channel. I am glad the Pioneer is okay. I really like it as my bedroom system. Getting the tube preamp fixed shouldn't be a problem as there are a few guys in Beijing that can fix these things but old solid state can be a bigger problem. The people who fix this stuff charge about $25.00 (not per-hour but total) to fix stuff. Of course sometimes their ability can be so-so.

Thanks to those who replied to give me advice, hats off to you!

:)

What does a SA 8800 II look like anyway? thought there was only one silverfaced Pioneer SA 8800 :scratch2: you mention a "video input" something Im sure the SA 8800 never had.


Besides celebrating my 300 post :banana:

What does a SA 8800 II look like anyway? thought there was only one silverfaced Pioneer SA 8800 :scratch2: you mention a "video input" something Im sure the SA 8800 never had.


Besides celebrating my 300 post :banana:



Look right here !!!! (http://audiokarma.org/forums/showthread.php?p=893045#post893045)

Look right here !!!! (http://audiokarma.org/forums/showthread.php?p=893045#post893045)

WOW! That one looks sweet!

Did know about the 8500 II but never seen the SA-8800 II
guess this one must be prior to the fluoroscan SA-8800 or perhaps a model for the Japan market only.

Thanks.

I meant that I plugged the red RCA plug into the video output on the dvd player. Of course the SA 8800 II has no video input.

It was made for the Japanese market but many ended up in Hong Kong and over the years this one ended up in Beijing. It will probably end up in the US someday, God willing.