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Ron's Pioneer SX-1500TD - Printable Version

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RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-23-2016

Finally, last night, I had just enough time to reinstall both boards in the receiver and quickly try it out with headphones.

It sounded fine...

This evening, I connected a couple speakers and let it go. Immediately, I noticed that the left channel seemed flat while the right had more brightness. I'll have to look into that.

But the important thing for now is...it has played for over three hours with absolutely no static.

RE: Ron's Pioneer SX-1500TD - PhilcoMike - 03-24-2016

Glad to hear the progress Ron. Did you rebuild the tone control board too?
If not take a look at that board.  Maybe rebuild time too.

Thanks,

Mike

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-24-2016

...good call...I was thinking the same thing...

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-24-2016

Ah HA! The control unit board W15-080 (bass and treble controls) has one electrolytic in each channel (two total)...they probably should be replaced with polyester.

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-25-2016

Okay,

Regarding the lack of brilliance in one channel: Nevermind.

It was the speakers! Icon_eek Icon_wtf Icon_confused

Having some time to experiement this evening, I decided to do the simple test of switching speakers before proceeding further.

Yup...the brilliance was now in the left channel while the right channel sounded flat.

So...I quickly substituted a different pair of speakers and...it sounds fine in both channels. Icon_thumbup

Now it will go into my home office and become a "daily driver" for awhile. With the new LED bulbs in every position save for the FM Stereo indicator (which is still incandescent), it looks as good as it sounds.

I did take notes of the passive components needed for the tone control board, and I may rebuild that in the near future anyway just as a preventive measure.

That is it for this thread. (see below) Thanks to those who participated, and to those who demanded Icon_wink that it be reopened.

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-25-2016

I bragged too soon.

Oh, it still plays just fine, no static, even fidelity in both channels...EXCEPT in phono mode - the right channel is dead in phono mode! Icon_crazy Icon_redface Icon_cry Icon_evil Icon_sad

Back to the workbench with it tomorrow for some signal tracing...

RE: Ron's Pioneer SX-1500TD - morzh - 03-25-2016

Gotta be something simple.

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-25-2016

Hoping so...

RE: Ron's Pioneer SX-1500TD - sam - 03-26-2016

  Icon_think  I have a sony with phono.   same thing r/s not working  on phono Icon_neutral
will be watching post pics too Icon_thumbup

me`s freind

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 03-26-2016

Well, it's fixed - and a real DUH! moment for me.

I traced the loss of signal to Q3 on the head amp (phono preamp) board (see schematic below).

Then I took a close look...

...and saw that, yes. I had installed Q3 backwards (collector and emitter switched).

Like I said, DUH... Icon_sad Icon_redface Icon_rolleyes Icon_crazy

Removed Q3, tested it and (amazingly) it was still good. Reinstalled, making sure the leads were in the proper positions this time.

Worked like a charm...

[Image: http://www.philcoradio.com/images/phorum/SX-1500TD/W21-001a.jpg]

The SX-1500TD is back in my home office now. I'm listening to the smooth tones of Nat King Cole playing on my Technics turntable as I type. Icon_thumbup Icon_thumbup And even though the record (Love is the Thing, 1957) is in mono, the music is coming through both channels...nice and clear...sounds great.

So now, that is it for this SX-1500TD thread.

RE: Ron's Pioneer SX-1500TD - morzh - 03-26-2016

Actually it is not amazing that it is still good. Low current plus the fact that transistor is somewhat symmetric (kinda) as it is NPN affer all. Just the two diodes are a bit different. Has it been large current with large V then maybe it would croak. Here it was simply very low gain amp Icon_smile

RE: Ron's Pioneer SX-1500TD - codefox1 - 03-30-2016

Glad you got it. I have a pile of "stuff'" that will out croak me too.

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 04-02-2016

Thanks, Bill. One week later and the SX-1500TD is doing very well indeed. The LED lamp that illuminates the AM tuning meter is intermittent, but otherwise, this receiver is doing quite nicely as a daily driver. I'm also using it to amplify my computer audio instead of using separate computer speakers.

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 09-06-2016

Shortly after my last post, I opened the Pioneer back up to find that I hadn't tightened the bulbs behind the AM and FM tuning meters adequately. Icon_redface That problem was quickly solved and the receiver has been an excellent, highly reliable daily driver for five months now. Icon_thumbup

RE: Ron's Pioneer SX-1500TD - Ron Ramirez - 09-30-2016

...and now it's gone. Icon_sad

I sold it to help pay for my "new" (to me) 1964 Bozak Urban speakers.

Well, I'll have to restore my Pioneer SX-9000 this winter...it's much like the SX-1500TD with the addition of a built-in reverberation unit.