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GB for Salas Folded Simplistic Phono PCB

diyAudio Chief Moderator
Joined 2002
Paid Member
big roadblock is obtaining matched 2SK369BL's.

I have included a table for 10-15 mA 2% Idss tolerance 369 matches in the guide. That is I actually tested them on the breadboard with the source pin resistors mentioned.
So its a broad range that should make many samples usable. When they run at about 9mA bias after degeneration with proper Rs they present the same transconductance.
So if you got 13mA samples you know what resistors. 12mA, again you know, etc.
Use the next nearer mentioned resistor for midway Idss. I.e. you got say 12.6mA match use the next higher mentioned Rs. I.e. the one for 13mA. If you got 11.4mA use the resistors of 11mA etc.

P.S. It will even work with same IDSS & Rs table K170s at input but in less gain and bit more noise. A compromise.
 
Took the liberty to add it up. If everyone could please check.

Big thanks to Salas and Tea-bag

1MOR 1x board 1x minikit
vgeorge 1 x board
shoom 1x board 1x minikit
VT67 1x board 1x minikit
dimkasta 2x board 2x minikit
merlin el mago 1x board 1x minikit
Bksabath 2x board 2x minikit
Rodeodave 1x board
skouliki 1x board 1x minikit
Bixbacon 1x board 1x minikit
Rush 1x board 1x minikit (?)
jims 1x board 1x minikit
Botte 1x board 1x minikit
Joshua_G 1x board 1x minikit
Gijsch 1x board 1x minikit
Rcruz 2x board
Nezbleu 1x board 1x minikit(?)
analog_sa 1x board 1x minikit


21 boards 17 minikits
 
Member
Joined 2009
Paid Member
Big thanks to Salas and Tea-bag

1MOR 1x board 1x minikit
vgeorge 1 x board
shoom 1x board 1x minikit
VT67 1x board 1x minikit
dimkasta 2x board 2x minikit
merlin el mago 1x board 1x minikit
Bksabath 2x board 2x minikit
Rodeodave 1x board
skouliki 1x board 1x minikit
Bixbacon 1x board 1x minikit
Rush 1x board 1x minikit (?)
jims 1x board 1x minikit
Botte 1x board 1x minikit
Joshua_G 1x board 1x minikit
Gijsch 1x board 1x minikit
Rcruz 2x board
Nezbleu 1x board 1x minikit(?)
analog_sa 1x board 1x minikit
Marra 1x board 1x minikit
 
1MOR 1x board 1x minikit
vgeorge 1 x board
shoom 1x board 1x minikit
VT67 1x board 1x minikit
dimkasta 2x board 2x minikit
merlin el mago 1x board 1x minikit
Bksabath 2x board 2x minikit
Rodeodave 1x board
skouliki 1x board 1x minikit
Bixbacon 1x board 1x minikit
Rush 1x board 1x minikit (?)
jims 1x board 1x minikit
Botte 1x board 1x minikit
Joshua_G 1x board 1x minikit
Gijsch 1x board 1x minikit
Rcruz 2x board
Nezbleu 1x board 1x minikit(?)
analog_sa 1x board 1x minikit
Marra 1x board 1x minikit
Seve 1x board 1x minikit

I don't know if its the plan to update here. I have updated the "excel"

Seve
 
diyAudio Chief Moderator
Joined 2002
Paid Member
We will much likely not be able to enjoy a max gm least noise Toshiba JFET sound again in the near future. The semis industry moves otherwise. BJTs can technically stand but sound different. This one will become a rarity phono example soon. Build it well.