Noisy phono stage on vintage Pioneer SX-434 - diyAudio
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Old 19th April 2013, 09:30 AM   #1
spuncut is offline spuncut  Denmark
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Default Noisy phono stage on vintage Pioneer SX-434

Hi nice people at Diyaudio

I'am restoring a vintage SX-434 with a rather noisy phono stage.
Some say that the older Toshiba BJT's is getting noisy'er by the
time or maybe modern types are just better.
Would it help to replace the transistors with some modern type, say
BC550, or is this simple configuration just noisy by design.

Regards
spuncut

Last edited by spuncut; 19th April 2013 at 09:07 PM. Reason: Faulty IMG-tag
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Old 19th April 2013, 03:24 PM   #2
spuncut is offline spuncut  Denmark
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How come the image don't work ?
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Old 19th April 2013, 03:48 PM   #3
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When you open a reply window, go down to manage attachments and attach from your files. Try and use images around 100K
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Old 19th April 2013, 04:11 PM   #4
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Good transistors for phono stage use would be the SS9014/15 pairs. They are designed for this type of use. http://www.google.com/url?sa=t&rct=j...45373924,d.b2I
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Old 19th April 2013, 04:45 PM   #5
spuncut is offline spuncut  Denmark
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Is this better :
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File Type: gif pioneersx434-01.gif (36.0 KB, 54 views)
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Old 19th April 2013, 05:29 PM   #6
spuncut is offline spuncut  Denmark
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Quote:
Originally Posted by jerluwoo View Post
Good transistors for phono stage use would be the SS9014/15 pairs. They are designed for this type of use. http://www.google.com/url?sa=t&rct=j...45373924,d.b2I
Thanks

Any point in replacing the resistors to metal-film types ?
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Old 20th April 2013, 04:01 PM   #7
rsavas is offline rsavas  Canada
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512-KSC1845FTA from Mouser. Check the pinouts
No need to change the R's until you you figure out the noise source.
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Old 20th April 2013, 07:18 PM   #8
djoffe is offline djoffe  United States
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are both channels equally noisy?
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Old 20th April 2013, 09:34 PM   #9
spuncut is offline spuncut  Denmark
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Yes both channels, no pu connected, no noise on aux, hiss, no hum.
I was wondering if it is true that these transistors should get noisyer at old age ?
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Old 20th April 2013, 09:49 PM   #10
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First of all, replace all electrolytic capacitors.
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