Threshold FET 2

[Nelson Pass]

Just a different layout I think.

 

[Buhl]

OK - hard for me to judge

I noticed that the PSU does not use the two 24 regulators seen in the earlier pictures this one uses a TO3 style transistor, and only one capacitor (not a balanced psu with x - 0 -X volt but 0-x volt?

Also, I see several more of the 10uF coupling caps - also can't find the capacitor values on the previously posted schematics....

Best regards
Hans

 

[Buhl]

Another question.... A friend of mine is trying to trace where some of the noise in the Phono input of my FETII series 1 could come from. Found two small 150mh coils at the input of the RIAA circuit - see attachment. Wondering why they are there? When you put a metal screwdriver near them, the hum rises considerbly - we suspect they act like small antennas ....?

 

[Zen Mod]

try without them

 

[Buhl]

Hi ZenMod - I have of course thought of it, but what if they were meant to be there? won't I rist sending the JFET's into ultrasonic oblivion if it's meant as protection to them?

Best regards
Hans