2SK170 BL MC step up amp

[Salas]

5 x AA = 7.5V on top of R1

Maybe add another AA to up the voltage (6 x)

 

[acidbrain]

Okay Salas, i will try that out. Thanks!

 

[acidbrain]

I thought that it could be my Rondo Red an bought a Ortofon Quintet Bronze. Thas was not the solution and went back to the BIB's 1.1 and everything is more smooth now. Don't know if i will keep the Bronze, not sure how good it handles pop/rockmusic. Vocals and rhythm is far better with the Bronze.

 

[rhafley]

Please forgive my ignorance as I am learning. Does this circuit invert the signal?

 

[Salas]

Yes it does

 

[rhafley]

Thank you for the response Salas! Is there any effect on what the listener would hear between the inverted or a non-inverted signal provided both the left and right are in phase with one another?

 

[Salas]

Some say absolute phase matters some say not. We also don't know if its actually preserved in the various recordings or not. In any case you can reverse the polarity of speaker cables at both cabinets terminals and compare. That way you know its restored in your system chain at least.

 

[dreamth]

Part of the fact that we like vinyl is exacly the phase loss due to mechanical reading inacuracies.

 

[woodturner-fran]

Salas,

Just a word of thanks - I found this thread when looking for a schematic for a MC step up for a Pass pearl. I used a "teddy reg" to supply power given that the current demand is constant enough and the teddy reg is very quiet on its output although with high enough output impedance. Anyway, after the usual issues of chasing down hum, it is singing away and sounding lovely. No surprise that it it suits the Pearl so well I suppose.

If I adjust the supply voltage I'm looking to have about half the supply voltage on the drain?

Fran

 

[Salas]

Fran hi, you are welcome. About 2.5V drop across 180Ω drains load if you actually used 7mA IDSS K170s. Go for about 5V across the JFETs in any case.

 

[woodturner-fran]

OK, thanks Salas. Another winner from your stable.

 

[Salas]