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Old 19th November 2012, 02:52 PM   #3481
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Quote:
Originally Posted by Salas View Post
Fine then. Using a heat sinked Caddock for dummy load testing even, that is top style.

How much raw DCin room does the rectification allow you now?
Was it the small cap doing the monkey business before? What do you think?
The 15K Caddock is the only resistor that I have on hand aprox. to 10K

DCin 324V aprox.
Surely, now is time to enjoy Valve Itch & later I will work on the old SSHV2 pcb.

It's a good idea first of all start with the CCS & check it is OK so after can be follow the rest of building.

Thanks again for support.
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Old 19th November 2012, 03:00 PM   #3482
Salas is online now Salas  Greece
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It will be good if you will pin point the bad part for knowledge in the future. Either dodgy Depletion after some event, because there was the bricked VR4 to indicate something must had happened, or the small cap was doing something were my suspicions. Anyway. Nice Vin-Vout, stable regulation in the context of the real build and load, all well!
Let us know in the Itch thread if it restored to original sonics or to something better after enough Jazz records.
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Old 19th November 2012, 03:07 PM   #3483
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I well noted the small cap to repair the old pcb. You are right Depletion Mosfets are delicate so with minimum issue I will recommend to change as per your advice.
I will post in the Valve Itch thread if improved or not the subjective very good sonic perfomance, do you like also Jazz?
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Old 19th November 2012, 03:21 PM   #3484
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Big gamut, from Jazz to Punk to Classical.
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Old 19th November 2012, 03:26 PM   #3485
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Old 19th November 2012, 03:29 PM   #3486
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All music genres are great when the artists aren't faking it and the listener's mood and situation is right for each style. Great appreciation in some ethnic too.
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Old 19th November 2012, 03:31 PM   #3487
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Congrats, Merlin....really good sound with those regs, when they are working. I replaced the sk117 and irf840, no result. But I received a mail from Teabag today saying that the PCB including 2 sets of semis is sent, so I am going to wait some days and then rebuild it from the ground again. This time I'll use crimped wires and lots of patience and so on...when done, I'll post a pic of a nice black meshie AZ1 from Miniwatt Italy, never seen before.
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Old 19th November 2012, 03:38 PM   #3488
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When yours was working before the first shorting accident, it was fully installed and grounded, right? After exchanges, was it restored to all installation details equal also? Trying to understand if there is another parameter at play too. Is there a film cap across the input connector, or its input cables are short enough to last rectification capacitor? Did you always use the same C1,2 capacitors after the two accidents? Can exchange those? A picture of the whole build could give a clue to something maybe. Can take a photo?
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Old 19th November 2012, 04:46 PM   #3489
Jogi is offline Jogi  Germany
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Yes, was installed but just on a breadboard for testing, second PCB also was first working on breadboard, the I put in in place in the preamp, grounded and all. And then, zing...
I exchanged the 0,33 cap, not the 10, because this is the only one I've got right now. I don't think it is the culprit, it is more of replacing wildly parts, missing the broken one and shooting another healthy one, moving in a circle. Better to replace all of them, including zeners, it takes less time. Would be different if I could use a scope or something like that, then troubleshooting is much easier and precise.

I give it a rest now, also because all spare semis are gone now, so I am forced to wait. Will test the 10 in another build just to be sure...I'll take a photo later, of the working reg plus preamp.
Thanks for your support, Salas, very appreciated.
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Old 19th November 2012, 04:51 PM   #3490
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The zing was later than the installation moves? It happened at a point you had used it healthily in box for a while?
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