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Old 4th January 2009, 04:40 PM   #1
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Default Pioneer PD-8500 output stage mod

Hi all Forum Members.

Please help me.
I have a Pioneer PD-8500 cd player. This cd player use a piece of BB Pcm-63K dac/channel. I want to built another, better output stage.
I have two idea.
1 Transformer output whitout tube. Sowter 8347, or Lundahl LL1620.
2. Fet output stage.
What is the better? Have anyone a better idea?
I have two Lundahl schematic, but i haven't got a Sowter schematic. What do you think for these?

Tnank you your help.

Sorry my bad English.
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Old 4th January 2009, 07:31 PM   #2
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use xformer output , then Jfet buffer

been there ....
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Old 4th January 2009, 08:24 PM   #3
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Default Pioneer PD-8500 output stage mod

Hi all.

Dear Zen Mod.

Tell Me please what is a xformer output. This yet too complicated for me. I'm an electronik beginner yet.

Here is the second transformer schematic, what I have.

Thank you your help.
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Old 4th January 2009, 08:48 PM   #4
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xformer =transformer

what is input impedance of next stage ( preamp ) ?
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Old 4th January 2009, 11:44 PM   #5
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Default Pioneer PD-8500 output stage mod

Hi all Forum Members.

Dear Zen Mod.

I have a Pioneer VSX-839 AV Reciver. This reciver is my preamplifier.
Input sesitivity/impedance CD stage is 335mV/47KOhm.

Thank you your help.

Sorry my bad Engkish.
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Old 5th January 2009, 12:00 AM   #6
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in that case you'll certainly need buffer after transformer outputs and preamp ;

input impedance of your next (preamp ) stage is too low for transformers in that place and role ;

besides that - when you ( and if ) you made that modification to PD , your receiver will be way below in quality .
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Old 5th January 2009, 10:19 AM   #7
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Default Pioneer PD-8500 output stage mod

Hi all Forum Members.

Dear Zen Mod.

I think, I understand what you say for me. What you recommend me, what I do? What kind of buffer do you think?
Which you recommend me, from among two schematic? That I showed it?

Thank you your help.

Sorry my bad English.
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Old 5th January 2009, 10:29 AM   #8
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these "two" schematics are in fact - same .

regarding buffer - do you have possibility to buy from e- bay ?

presuming your lack of experience , maybe is best to buy ready made buffers
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