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While I'm recovering from lithotripsy I've been looking at this Pioneer tube receiver.The big thing on these old Japanese units like Sansui and Pioneer and others is you need to change out the old oil caps.These aren't the quality pios that we use from Russia and the USA..They are all leaky for the most part as well as you will find several out of tolerance resistors.Do not use pio caps in the tuner IF because they are metal cased and they will cause issue with because they are large.. You don't even want to use expensive caps here because you want a dipped cap as not to not detune the with long leads or metal cap bodies..Use pio caps in the output stage and voltage amp and preamp out if you wish.You can see I used orange drops and then K40ys in the preamp stage.Here is a weak spot in the tuner IF where these oil caps are.Use a dipped cap here like a mylar or polyester or a polypro..Sonics don't change here.Here is where I changed the ones I pointed to.
" I have much more to do on this like changing out the bypass lytics to muses and I'll put a new cord on as well..I changed filter caps on top as you can see. McShane has all the parts you'd need.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Follow Ups:
EEEEEEh -reading up on lithotripsy, the defition is using 'physical force'-hope they did not use a hammer!!!!
Recover well my friend!!
Regards,
Duane in Clearwater( hot like everyone this summer0
high energy sound pulse. They tried using that with other forms of surgery like bone spurs with nasty failures.
I have a Pioneer tube integrated amp and a Lafayette "Made in Japan" receiver. I think it is actually a Trio (Kenwood). I had the Lafayette running for quite a while but now it needs new filter caps. I don't remember any PIOs, but it has been a long time since I have had the top off of either, so I may be remembering wrong. Thanks for the tip!
The interesting thing about these pieces is that the amp seems to be exactly the same design, even though they are from different companies. Even the transformers appear to be the same.
If I recall correctly, the infamous Joe Rosen thought that these Japanese amps ran the tubes to hard.
Dave
Dave
Those gray caps in them are oil caps.Most people change them out because when they leak DC,tubes will run hot because they pass DC to the tube grids.I haven't seen the Japanese receivers run hot once they working properly.No hotter than any other tubed receiver.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Hi Michael,
I think by "run hot", he meant that they went trough tubes too quickly.
Dave
Hi, I think the rat nest picture was the poster child for getting circuit boards into use, even though a lot of vacuum tube guys want point to point wiring....Mark K.
Boards are cleaner, but most of the boards back then were not the best quality.
Dave
My God what a rat's nest! Even back when I was restoring vintage gear instead of doing diy (back when it could still be had for reasonable prices) I always shied away from receivers for that very reason. Too much stuff in the way! Good luck Mike, I don't envy you the task you have taken on.....
Vinnie
You are correct about receivers being a rat's nest but the worst part is the MPX or tuner RF. Those are cluster you know whats.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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