Coupling capacitor voltage

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modulay

modulay

Well-known member
Joined
Aug 6, 2008
Messages
63
Location
Spain
Hi friends.

I'd like to use a Solen MKP on an Alctron HST-11A mod,
My idea is to use 1uF, 250V for C8 in the schematic.

If B+ supply is about 160V-180V...why 450V capacitors?
Is not a good idea to use 250V caps?

Another question...What type of cap would be good for C4?
Wima MKP?
Styroflex?
Another type?

Thanks
 

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I'm not sure if this pertains to this circuit but i know with some tube circuits, when you turn them on there can be a short spike in voltage up in the 400v+ range, hence the higher rated parts. But that's all dependent on the power supply.
But if thats like the apex 460. I was fine using a 250v wima.

btw what mod is that
thanks
AC
 
Thanks for the response.

Yep, the right schemo is Apex460 one.
This schematic is from an Alctron I modded a time ago.

The actual mod is:

GE 6072 tube
Haufe T14/1 trafo
AKG CK12 capsule
Cathode follower remove
C9 and C10 remove (RFI supressing?)

Then, higher rated caps should be bypass and output capacitors...is that correct?

 
No, I think you will be fine with 200v + rated. The power supply charges up slow(ish). so you will be fine with that rating
good luck
AC
 
I'm not familiar with that mic per se, but shouldn't the B+ be closer to 120V? The capsule fixed pol voltage is B+/2 and you're using a CK12 that likes 60V... ?
 
I don't remember exactly which is B+ value. I will measure it when I receive the stuff.
If necessary, will modify voltage divider for capsule pol voltage.
Does Nylon CK12 work with 60V?
 

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