It seems that I am about to build my liquid cooled Sony Vfet , finally 😉
I need from you guys some info to do so , do the 2SJ313/2SK2013 need to be matched ?
are the TO3 IRF 240/ 9240 "better" in a way than the TO247 , fact is I would like to have them all TO3 🙂
well , I thing I will stick around for awhile , it's an serious build 😀
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I need from you guys some info to do so , do the 2SJ313/2SK2013 need to be matched ?
are the TO3 IRF 240/ 9240 "better" in a way than the TO247 , fact is I would like to have them all TO3 🙂
well , I thing I will stick around for awhile , it's an serious build 😀
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No, matching is not required. I used the TO-3 's also in my VFET-X amplifier. It sure looks much better:
VFET-X (or my 1/3 40th Anniversary Sony VFET Clone)
But they measure the same as TO247, so no difference. They are a bit hard to find nowadays in TO-3.
VFET-X (or my 1/3 40th Anniversary Sony VFET Clone)
But they measure the same as TO247, so no difference. They are a bit hard to find nowadays in TO-3.
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Tanks for your answer , You have made an very nice build Walter 😉
Tanks to Nelson Pass we all have here very good time 😉
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Tanks to Nelson Pass we all have here very good time 😉
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yes, more than done! 😉
btw, i have approx. 20mv an 100mv on the outputs and the amp sounds still excellent 🙂
hello everyone ,
do the IRF 240 and IRF9240 on both channel have to be matched ?
example : the irf240 channel rigt matched with the irf240 channel left and so on
Thank's in advance
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do the IRF 240 and IRF9240 on both channel have to be matched ?
example : the irf240 channel rigt matched with the irf240 channel left and so on
Thank's in advance
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I personally wouldn't bother. They are in the regulator section and 'mismatch' may give
you a small fraction of a volt diff in rail voltages at the vfets.
you a small fraction of a volt diff in rail voltages at the vfets.
It seems that the trimpots are a real "thing" in this build , is the lower the ppm /° the better , like this : Y0056500R000K0L Vishay Precision Group Foil Resistors | Mouser France
price is not a concern for me , i want my amp to be stable
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price is not a concern for me , i want my amp to be stable
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If price is not a concern, those could be one of the best:
j. 1240W (5K ohm @ 5%) (5K ohm)
g. 1240W (500 ohm @ 5%) (500 Ohm)
😎
P.S.: Although I'm not sure if trimpots affect the sound in DIY Sony VFet build..
I already have those trimpots in my F6 , not for the sound , but for the stability , it's all i like to have
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Pass DIY Addict
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I would think that using a multi-turn pot will pay the largest dividends in terms of setting the adjustments properly. I used single-turn pots that came with the kit and it took a bit of effort tweaking back and forth. Once it was set, I checked it a few times and not I just don't think about it anymore.
Hi
I had my Vfet running for a while but one channel did not went so well. I want to rebias the FE and tune the amps. Is it possible to do it without desoldering the vfets and dismantle?
thanks
I had my Vfet running for a while but one channel did not went so well. I want to rebias the FE and tune the amps. Is it possible to do it without desoldering the vfets and dismantle?
thanks
I've done exactly that. It's possible, but all the pots interact with each other, especially since the feedback loop is closed. Go slowly with tiny changes to the potentiometer settings, let the temperature equalize after each setting. You'll get a feeling for the direction the circuit is going in.
I described my setup in post #88 https://www.diyaudio.com/forums/pas...et-illustrated-build-guide-9.html#post5009054
I described my setup in post #88 https://www.diyaudio.com/forums/pas...et-illustrated-build-guide-9.html#post5009054
i saw it but i dont have 4 DMM. only 2. that way is almost insane to achieve good results. I saw a procedure where we would lift some resistors and other things. But didnt really understood it