Pioneer PD-8500 output stage mod

[BottleheadMan]

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.

 

[Zen Mod]

use xformer output , then Jfet buffer

been there ....

 

[BottleheadMan]

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.

 

[Zen Mod]

xformer =transformer

what is input impedance of next stage ( preamp ) ?

 

[BottleheadMan]

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.

 

[Zen Mod]

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 .

 

[BottleheadMan]

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.

 

[Zen Mod]

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