Official M2 schematic

[Soundhappy]

What would be a good replacement for the Panasonic ERX range of 3W resistors? They are getting hard to source. Especially around here.

Interesting ones is metal plate MPC74 0.47 R | 5 watts made by Fukushima Futaba in Japan.

8 X FUKUSHIMA FUTA MPC74 0.47R 0.47 OHM 5W 10% NON-INDUCTIVE RESISTOR | eBay

Enjoy !

 

[henryve]

Interesting ones is metal plate MPC74 0.47 R | 5 watts made by Fukushima Futaba in Japan.

8 X FUKUSHIMA FUTA MPC74 0.47R 0.47 OHM 5W 10% NON-INDUCTIVE RESISTOR | eBay

Enjoy !

Thanks. I see RS now stock them.

 

[Soundhappy]

I have try Panasonic and wire wounds and my prefered choice are MPC74 in source resistors position.
Mills brand non-inductive are interesting too but cost is high and not sure they sound like Futa
Have a nice day

 

[Soundhappy]

I get few LSK jfets pairs this is my candidates for M2.
Could somebody remember me information about desirable Idss range ?
My pairs are ~ 6 | 8 | 10 mA. Thanks in advance

 

[Zen Mod]

use 8

 

[Soundhappy]

use 8

Ok cool thanks Mighty ZM
Best regards

 

[Zen Mod]

rest of them burry in backyard , and watch them grow

 

[Soundhappy]

rest of them burry in backyard , and watch them grow

LSK matched pairs was scarce to get and i get lucky 8 mA Idss one set from four.

Btw total cost with shipping was more 200 $
Maybe i make gift to my younger brother so he diy with jfet's precious ring for his fiance.
Gold and diamonds are old fashion

What the adaptation in jfet's circuit tricks for 6 |10 mA pairs ?

 

[Zen Mod]

for 6: nuttin' - just toss them in without source resistors

for 10: nuttin' - just toss them in with , say, 15R source resistors

 

[Rothor]

Finaly got the time to start putting my M2 together. About to connect one of the chanels, to check if it does what it's supposed to do. Hopefully it's not the last picture before the fire alarm goes off... :0

https://www.dropbox.com/s/e9fl7d4wtgcn9mw/Foto%202017-04-15%2017%2026%2026.jpg?dl=0

 

[Zen Mod]

looks good for now

 

[brianco]

nice, clean work.

[What is that 8 legged thing doing in there (on the floor)???]

 

[bkdog]

nice, clean work.

[What is that 8 legged thing doing in there (on the floor)???]

Looks like a 6-legged thing to me, and it looks like it should be in the socket near it...

 

[Zen Mod]

yup

6 legged

 

[Rothor]

Was such a mess having it 14-legged...

 

[Rothor]

https://www.dropbox.com/s/8yjhidweibcmrkk/Foto 2017-04-17 20 41 45.jpg?dl=0

Up and (just about)running. But, after having looked through all postings, I still can't figure out exactly how to meassure the offset? Or is it just too obvious how to...? :/

 

[Zen Mod]

voltmeter between black and red speaker post

simple , isn't it ?

 

[Rothor]

voltmeter between black and red speaker post

simple , isn't it ?

Thanks a lot Zen!
Thing is I was just thinking that maybe I was making things more complicated than they really are, so I was just testing that: Offset 0,4 mV And about 0,640 V at R13/R14.

My first build, so I'm very happy!!!

Thanks for all your help!
//Ronny

 

[Zen Mod]

put lid on , leave it cooking , recheck both offset and Iq after temp equilibrium

though m M2 is extremely civil there , minimal difference between cold and hot state

did you checked sound yet ?

 

[Soundhappy]

for 6: nuttin' - just toss them in without source resistors

for 10: nuttin' - just toss them in with , say, 15R source resistors

Thanks Zen Mod