R111-3K , R112-5K , R113-1K pot , R121-820R ,
R122-1K2 , R132-820R , R161-14K7 , R162-14k7
So you don't use the above values but the original Andy's 4R version except R141_142 at 0.15Ω.
R111-3K , R112-5K , R113-1K pot , R121-820R ,
R122-1K2 , R132-820R , R161-14K7 , R162-14k7
Hi Andy
Can i ask you something ? once you make the version 4R same story here
...
Which is the bias Ampere that you set your amp?
Did you put also the capacitor C134 2200pf?
I see your construction in a box how about the temperatures ?
Κalispera my friend Andy.So I re-housed the amps in a 5RU Modushop case, having 300 long & 210 high heatsinks; these don't cool the output devices quite as well as the fan configuration did - so I am about to change R15/R16 to 0.15R (which should reduce the heat output - and the device temperatures - slightly)
Andy
First of all I would look at my mosfet connections....I don't trust that type of Molex type connections....I have also seen point to point connections on to ONE mosfet? (filter 47Ω+220pf) ? Blurry image... look for loose connection......etc reduce mosfets wires .. ..increase the resistors gates ...all these with gen and scope..
Andy,
Nikos is on the right path I suspect. I also see a point to point method of attaching the snubber circuit for the Mosfets…in my honest opinion, the pcb that X sells is a much more optimized option with the snubber circuit, gate stopper, etc…all intrinsically attached to the respective pcbs. Long leads from the main pcb to the Mosfets is always a risk for possible oscillation unless a properly designed and implemented snubber circuit is included.
Andy
First of all I would look at my mosfet connections....I don't trust that type of Molex type connections....I have also seen point to point connections on to ONE mosfet? (filter 47Ω+220pf) ? Blurry image... look for loose connection......etc reduce mosfets wires .. ..increase the resistors gates ...all these with gen and scope..
Hi Andy
Doesn't translate Diyaudio for me.....
English is not my native language...I edited and corrected it in English.
I had previously done a copy paste from Google translate to be sure that I am not writing them wrong....
Please tell more about the Nmos to Darlington swap Andy/Hugh.
Is this change specifically for the 4R version? Would there be a difference in the standard 8R build?
Thanks🙂
Sounds like this could be an interesting experiment, thanks for the info Andy🙂