Simplistic Mosfet HV Shunt Regs - Page 351 - diyAudio
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Old 20th November 2012, 01:21 PM   #3501
massimo is offline massimo  Italy
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Quote:
Originally Posted by euro21 View Post
Merlin, where did you buy this blue grommets? Mcmaster-Carr?
Yes, McMaster-Carr, bought in the USA as they don't sell almost anything abroad
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Old 20th November 2012, 03:25 PM   #3502
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Grazie/thank you massimo.
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Old 20th November 2012, 03:26 PM   #3503
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Originally Posted by Jogi View Post
Thanks guys for the good advice, did already most of it, except the fuse thing.Last PS cap is close by, 20cm or so.
Powersupply is AZ1- 1F-10H choke-150f-7H-47F film cap, so pretty nicely filtered. The 150 seems a bit big, but this was I had in the drawer, and for phono I don't want unnecessary hum or noise. Interesting though the Graetz thing, you mean using this together with AZ1? Could imagine it would have better bass and sounding tighter maybe.
BTW I really love those AZ1, gorgeous tube, still somehow not identified by the American and Eastern DIYers. Look at prices for EML mesh rectifiers, insane...
What's voltage is the1uF?
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Old 20th November 2012, 04:05 PM   #3504
Jogi is offline Jogi  Germany
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1000v, it has a hard job at this place.
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Old 20th November 2012, 04:07 PM   #3505
Salas is online now Salas  Greece
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High pk-pk ripple due to rudimentary value allowed.
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Old 24th November 2012, 06:16 PM   #3506
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Repairing old SSHV2 reg, first rearranged CCS now is OK, caps C1 & C2 don't touch pcb, 1K trimmer is OK, SK117GR is OK, Q4 is OK. Can't adjust Vout: is fixed 320VDC, can be IRF840? or KS1381? I have more IRF840 but I only have one used KS1381 that I don't know if is good or bad, could I use KSE350 or other semi?
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Old 24th November 2012, 06:25 PM   #3507
Salas is online now Salas  Greece
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KSE350 & MJE350 will work. Don't know what it can be still keeping it steady. Is the board perfectly OK if you will inspect with a magnifier? Maybe some HV incident could had damaged a track or created conductivity between adjacent lines? C1, C2 still OK for value?
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Old 24th November 2012, 06:32 PM   #3508
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Yes measured boths caps and are OK, I will change first the KS1381 for KSE350 to see what's happen, if still not fiex I will change IRF840, thanks for support Salas.
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Old 24th November 2012, 06:44 PM   #3509
vgeorge is offline vgeorge  Greece
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You can check your ks13981 for hfe and see if it' s good or bad. Did you measure Vbe in circuit to see that they are working ok or not?
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Old 24th November 2012, 07:06 PM   #3510
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Was the KS1381, now fixed all is going on OK
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