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-   -   how to calculate SE Coupling Cap Voltage ? (http://www.diyaudio.com/forums/tubes-valves/123800-how-calculate-se-coupling-cap-voltage.html)

calico88 27th May 2008 07:22 AM

how to calculate SE Coupling Cap Voltage ?
 
I'm building SE amp and I just got 200V Caps, I wonder how to calculate the voltage wheater it's enough or not ?

any sample or url ?

cal

Merlinb 27th May 2008 10:54 AM

Coupling caps must have a voltage rating greater than the supply voltage (HT).
Because, if the valve reaches cut-off, or if it is not plugged in, or if the cathode is not warm, the anode voltage will rise to the supply voltage.
I suspect your 200V capacitors will not be sufficient, however, it may be possible to connect two in series to raise the voltage rating...

calico88 27th May 2008 04:34 PM

the B+ is 125Volt, it's a 0.8 Watt amp. SE.
using 6247 and 5902

is not enough ?
I don;t know how to calculate.

cal

Merlinb 27th May 2008 10:48 PM

Quote:

Originally posted by calico88
the B+ is 125Volt, it's a 0.8 Watt amp. SE.
using 6247 and 5902

is not enough ?
I don;t know how to calculate.

cal

Then 200V will be OK on normal resistor loaded stages. (But not choke loaded stages- but I don't think you have one of those.)


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