Hi🙂
I have several pairs of 2sc4159 / 2sa1606 Can these be used in 2 pair slewmaster AS drivers ?
I have also 2sc3503E and 2sa1381F Will these be allright AS VAS and predrivers in kypton c amplifier?
I have several pairs of 2sc4159 / 2sa1606 Can these be used in 2 pair slewmaster AS drivers ?
I have also 2sc3503E and 2sa1381F Will these be allright AS VAS and predrivers in kypton c amplifier?
Those 2sc4159/sa1606 are ideal ... like the original HK680 toshiba drivers.
The mismatched 3503/1381's are alright , all my OPS's use these.
PS - If you are using Sanken outputs , you will have the best thermal tracking
because this matches the original HK Vbe.
I'm using MJE340 for the Vbe , BTW.
OS
Thanks:
I will use MJL4302 as output, actually I have used MJL4302 + 2SC4159 + 2SC3601 for about 10 years now in my "Harman Clone" +-50 PSU.
In that also use a separate PSU (unregulated) for all the stages minus output and driver driverstage🙂 but Slewmaster use Multiplier cap in PSU so maybe it´s not nessesary here in this setup🙂
Jason, OS, vzaichenko and other tech guys please take a look these circuit with Toshiba mosfets.
I'm not sure the VBE is correct, also what do I do with the previous trimmer, do I need both etc.
I do not want to post more circuit here even do it is similar. I don't want to pollute these tread.
I'm almost ready to etch the PC boards but I having second thoughts
Thank you guys in advance.
Greetings
I'm not sure the VBE is correct, also what do I do with the previous trimmer, do I need both etc.
I do not want to post more circuit here even do it is similar. I don't want to pollute these tread.
I'm almost ready to etch the PC boards but I having second thoughts
Thank you guys in advance.
Greetings
Jason or Vzaichenko would be the ones that ask. 😕
If I were to get my 2P "babies" LATFET , I could tweak that vbe.
If those toshiba's are latfet , they are NTC .... leaving only the driver Vbe .
Vfets are similar to the BJT's - using the same 2 device Vbe.
PS - the unchanged Vbe circuit is perfectly "tuned" for the BJT's (this I know !)
OS
If I were to get my 2P "babies" LATFET , I could tweak that vbe.
If those toshiba's are latfet , they are NTC .... leaving only the driver Vbe .
Vfets are similar to the BJT's - using the same 2 device Vbe.
PS - the unchanged Vbe circuit is perfectly "tuned" for the BJT's (this I know !)
OS
Last edited:
Gaborbela,
You have a thread already for this, so I'm not sure how your endeavour relates here. Ostripper has clearly concentrated his effort on BJT triples with the minor diversion vzaichenko and myself took down IRFP alley appearing quite unwelcome.
The Toshiba devices you so desperately want to use are rather unique, being relatively low threshold MOSFETs that are of vertical construction, with a tempco more like BJTs than Hexfets, and definitely different from laterals. Your application will require a unique solution tailored to your devices.
I have no direct experience with you specific devices, nor with the Cordell implementation of Hawksford error correction. Hopefully someone more familiar with your requirements can chime in on your new thread to help out.
You have a thread already for this, so I'm not sure how your endeavour relates here. Ostripper has clearly concentrated his effort on BJT triples with the minor diversion vzaichenko and myself took down IRFP alley appearing quite unwelcome.
The Toshiba devices you so desperately want to use are rather unique, being relatively low threshold MOSFETs that are of vertical construction, with a tempco more like BJTs than Hexfets, and definitely different from laterals. Your application will require a unique solution tailored to your devices.
I have no direct experience with you specific devices, nor with the Cordell implementation of Hawksford error correction. Hopefully someone more familiar with your requirements can chime in on your new thread to help out.
And there you go (like others) .... second guessing how I really feel..
PS - I'm not Shaan in the Peeceebee thread 😀 .
Modifying the BJT Vbe for HexFET's is welcome (as it does work).
Perfecting a dedicated Vfet or Hexfet OPS would be better as a new design
to incorporate the proper V/Id curve and gate protection where applicable.
Increasing the Vgs with the led was quite a good solution and should give nearly
BJT accuracy.
OS
The comment is just based on observations of you reaction whenever the HEXFET configuration is mentioned. Nothing more.
I forget to attach the thread..
http://www.diyaudio.com/forums/soli...at-fet-amp-toshhiba-mosfet-2.html#post4208071
http://www.diyaudio.com/forums/soli...at-fet-amp-toshhiba-mosfet-2.html#post4208071
I actually very pleased at how good the Hexfet ops sounds. Very, very good. Valery has been using it to test most of his OPS designs and he too has been very pleased.
Would you be so kind please take a look on that circuit😀 before I go on to etch the PC boards.
Thank you
I'm not against these modifications .
It's just that FET models suck and I could not stand behind what I am
not 100% sure of - so , I "passed the buck" (to the modifiers).
I've built IRFP OPS's - hence , my comment on the Hexfet mod.
PS - gaborbela , I've gotten the EC cordell to work very well with hexfets ,
but the latfet models "suck" (so I don't know).
My experience says a simple one device driver Vbe is all that's needed.
but adding the EC will complicate this considerably.
OS
OS
5 Kypton C and 5 Slewmaster 2P boards recieved fra PCBway today, great service and quality. I payed 75$ + shipping + Danish import duties complete 150$, everything took about 8 days🙂
Attachments
Can you please post the results of that simulation, do you plan to build it i.e. lay it out for fab? Looks Berry Berry interesting, comparing it to Damir's offering would be sweet...his is CFA on the front end and he is building it as we speak...😀
Hi OS,
No, I wasn't mad. Instead, I just would point out to the one who dropped the schematic (in this case you), that one need perfectly matched trannies for Q105.. Q114, that is, PNP to PNP and NPN to NPN. That's all. 😉
Cheers, E.
