Hopeless hoarder scores an RX-1100U

Soundscape said:
Here's a non scheduled program update to the RX **** show:

After 9 hours of nice listening time I decided to chase some light/moderate popping in the speakers. Happens upon power on & off. I think I've ran into the TSB service issue on this thing. I still can't find that TSB after checking under every bowl of rice, but I'm getting close.
R290 and C170 seem to be right at the heart of it:
R290 on the schematic AND parts list are a 22ohm , 1/4 watt green fusible resistor...but, the factory installed a 4.7 ohm resistor there. I had a 22ohm flameproof on hand so I replaced it. All was well on the DBT and enjoyed a song or two. The moment I plugged the RX into mains power R 290 farted magic smoke. I put the 4.7 ohm original back and now it works fine...playing music now.
My intent was to just replace the C170 (Nichicon CE Great Supply) with a KG Gold Tunes of the exact same value, which I did. Problem is, I knicked R290 with my glue removal tool. I pulled it and tested it a little out of spec. Tested 5.2 ohm vice 4.7 ohm with a gold band tolerance so I swapped the bitch with regret. Again, I put the old one back in and it's making nice music as we speak...monitoring.
I'll post a you tube video from Audio Tom. Looks like he bought this piece from a thrift store on the cheap, and was puzzled by these same 2 parts. I believe his RX had the TSB work done. R290 was a thermistor on his, and C170 was a BI-POLAR muse at a third the value of the original 4700uF polar cap. It's a head scratcher to me dudes. Though I'm enjoying the music now, I'm afraid to eveno_O look at it funny. It's old and quirky I guess, and so am I.

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Wanted your opinion...I'm obsessing over R290. It's been awhile, been enjoying the music. This piece has become my daily listener. Want it to last. Not anxious to tear it apart again for 1 resistor swap but it bugs me cuz it was out of spec last year when I called it good. R290 is a 4.7 ohm quarter watt green fusible testing 5.2 ohm when I left it. Was hoping someone would post the TSB on this over time, no luck thus far. I wanna swap it before it drifts higher and blows things up. Probably choose a Vishay...would a half watt upgrade be foolish?

Schematic on post 52 shows a 22ohm resistor in that location. Factory installed a 4.7 ohm, still in there and drifting up. The 22ohm I tried in the R290 spot in the past smokes.
 
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I have some Yageo FRM-25JT-52-4R7 4.7 ohm 5% metal film fusible on hand. They all measure about 4.8 ohms (corrected for lead resistance).

Let me know if I should send you one.

:beerchug:
James
 
Here's the parts list by way... I assumed it's a fusible type cuz it's green, prone to drift, and mounted vertically like a gremlin boner.
Also, I trust the accuracy of my fluke meters. I have some precision resistors lower than 4.7 laying around to keep them honest.
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I absolutely love threads like this. You've done amazing work to get that old girl going.

I once owned a CDX-1100U Yamaha cd player, got to assume same time line. Built like an absolute tank. I also had a later, mid 90's RX-?? of some such, big ol' heavy Yammie that was mint. I left it on for nearly 2 years, burning out the lights, but she sounded like a million bucks. Sold it and they guy merely installed new LED's and rocked it.

Yamaha stuff like that, well I'll never turn MY nose up at it. Quality stuff.
 
I know what you're thinking...The dudes a kook for re-opening a piece for 1 resistor after 5 months of listening bliss. I'm a Yamanut. But, I might have a 2nd reason to revisit the thing and feel better about it. I called them good enough but might have a power supply regulator or two getting tired. Q154. Any suggestions for a 2SD1913 replacement?
Or, just leave well enough alone. :idea:

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Soundscape said:
Any suggestions for a 2SD1913 replacement?
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There is KSD2012, hFE may be very slightly higher depending how much current you put through it, shouldn’t re be a problem:

and then there is KSC2334, slightly higher power but otherwise on the money:

I‘d probably go with the KSD2012. :biggrin:
 
Sparkplug said:
There is KSD2012, hFE may be very slightly higher depending how much current you put through it, shouldn’t re be a problem:

and then there is KSC2334, slightly higher power but otherwise on the money:

I‘d probably go with the KSD2012. :biggrin:
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Good stuff Sparky thank you sir.
 
I don't know where else to say this....Ozzy Osbourne passed away this week... So many albums & songs... I guess if I passed away today I'd listen to this one....

Cheers John...:beerchug:

 
Soundscape said:
I don't know where else to say this....Ozzy Osbourne passed away this week... So many albums & songs... I guess if I passed away today I'd listen to this one....

Cheers John...:beerchug:

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His last two albums, Ordinary Man and Patient #9 he definitely knew his days on this earth were becoming less and less.

If you do not have them you should get them. There are really great songs on both. Actually there are maybe two songs alltogether from both that I dont care for.

But If I knew the end was near id listen to Road to Nowhere .


Athanasios
 
Nashou66 said:
His last two albums, Ordinary Man and Patient #9 he definitely knew his days on this earth were becoming less and less.

If you do not have them you should get them. There are really great songs on both. Actually there are maybe two songs alltogether from both that I dont care for.

But If I knew the end was near id listen to Road to Nowhere .


Athanasios
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Thanks Sensei Nashou66. No more tears was the last album of his I listened to. Will check those newer ones ya recommended for sure. No rest for the wicked was my favorite album. Keeping the Oz man flowing with this one....

 
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