Thread: Sansui 551 sound distortion

Yes, the output transistors could be bad, but that's not the first place to look. You need to measure the DC offset at a point before the protection relay. Tip the unit on it's side, transformer down and take the bottom cover off. There should be a blue and a gray wire coming out of the bottom of the power supply board. Measure the voltage between the chassis and each of these wires. If it's 40v or more, it's likely the...

Quote: Originally Posted by arcaidy It amazes me every time I listen to it. I didn't realize FM could sound so good. Now I need a preamp and amp... Another one bites the dust.....

John Please do check on the inrush. Larry I'll PM ya. Got a Problem with B+.

Its a secret! G-O-O-G-L-E.... Don't tell anyone I told you. http://www.datasheetarchive.com/manu...rs/2377/1.html Then http://www.fairchildsemi.com/sitesea...ttr2=Power+BJT or http://www.onsemi.com/PowerSolutions/taxonomy.do?id=797 Once you get used to using there selection filters..Just takes a little practice. Both sites have a Cross reference guide ..But still some transistors are not listed in there database..The ones that do get a...

The DC at the input of the Right channel is 11mV. It doesn't seem like there should be any DC at the input of the power amp. The left channel has 0.5 mV. What do you think?

I doubt there were any NTE parts in that receiver when it was new. Rob

The lamps don't care about + to -. Wire them in series and they'll be fine. There's lots of different styles of lamps. Have to know what you have in order to make suggestions.

Quote: Originally Posted by Retro Stereo You'd be wrong with your pick of Minnesota though because we have the backing of all of Canada! Retro

Wow!

So the DC on the output of the amp is 11mV? That is acceptable.