Black Gate WKZ - can they be used in these circuits?

[DHTGUY]

I have a number of Black Gate caps that I bought years ago for a project. I am now considering if they can really be used in the circuit, as the voltage rating may not be high enough

The circuit is the driver and power stages of the ALFI HQ12SE 300B amplifier (circuit can be found on the web). Here are the circuits and Black Gate that I am considering. I have some other alternatives, and would like advice on what to use.

C7 and C8 of driver stage - here I want to use a single 220uF+220uF/350VDC, 400VDC surge, WKZ (I have four). The original design uses two standard 385v rated electrolytics with a bleed resistor across each giving 110uF rated at 770v. The Black Gate has a common negative electrode, so I cannot put the two halves in series. The circuit diagram shows 390v at this point. Will 350v / 400v surge rating of the Black Gate be high enough (I presume not). Can the WKZ be used here? Alternative would be a siemens MKV (B25833) rated at 780v. I have a number with 12,6uF each. They are supposed to be very good too.



I also want to use a 220uF 100v Black gate NH series at C13. Any comments?

Turning to the Power stage



I want to use the 220uF+220uF/350VDC WKZ here as well for C9/10. As I cannot put the two halves of the WKZ in series, then I presume they cannot be used here? Any tips? Can they be wired so as to use them for up to 700v DC?

For C11,12 and C13,14 I have Black Gate VK 350v 150uF. I can wire these in series to give the higher rating. How would two of these in series compare to several of the siemens MKV caps (which are about 10 times larger).

If I am going to use a mixture of the siemens MKV 12,6uF 700v and the WKZ, where should I put the WKZ for best effect? Should I just sell the Black Gates and use the Siemens?

Any (informed) comment would be much appreviated!

[commstech]

don't use BlackGate at all.... send them to me for proper disposal..

[tyo94]

You cannot use 350V for 400VDC surge especially for PSU (as you have plan for point C9-10). As far as I know they can't be wired. But for C11,12,13, and 14 you can do your plan, eventhough I think that would be seem improper , it's better you use the Siemens MKV one as it have more voltage.

WKZ usually used at the first capacitor after rectifier. You will see the magic of WKZ at that position. Just my 2 cents.

Anyway, please let me know if you want to let go the WKZ.....

[boywonder]

Since you have 4 pcs, you could use 1/2 of each cap as C7, C8, C9, and C10.......leaving the remaining half disconnected........