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Old 28th September 2012, 08:44 AM   #1
tomst is offline tomst  United Kingdom
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Default speaker coupling and power supply caps

Hi
I have a leak stereo 70 the PS caps have died and the the speaker out put caps on the way out i will also replace the rest of the
The amp has a 55 v out put from the transformer and and 75v power rail.
the two ps caps C6 and C7 are in parallel and measure 1250f 100vdc each my question is can i up this to a bigger value if the diodes (or if i fit some diodes) handle it. if so what would be a good value. I have the same question for the speaker out put/coupling caps what value and what make model, these are rated at 2000f 50vdc.
I was thinking Panasonic fr/fm/fc for the power pre amp, something like Panasonic ed for the power supply. and was going to use something a little more exotic in to couple the speakers. however most exotic caps don't come in values mentioned. looking at the diagram i think i should up the vdc of the speaker caps because if/when the o/p transistor go it will destroy the speakers.
Also is there a formula to work these values out.
if it helps the amp is 35w/channel
Thanks Tom
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Old 28th September 2012, 06:44 PM   #2
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within reasonable limits You can upgrade the C6 and C7 caps.
Something like 2200 Ufd / 100 V will work.
The output capacitors can e upgraded, yes. Even to 10x larger values, as long as they can handle least 50v.
I would allso add to C6/C7 a 100 nf foil capacitor too.
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Old 28th September 2012, 08:40 PM   #3
tomst is offline tomst  United Kingdom
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Thanks for replying
I'm guessing C6/C7 PS caps are palled to up the capacitance in limited space so original 1250f+1250=1500f? so upping the capacitance to 2200f+2200f = 4400f?
any advice on which make of cap to use on the output C34
Thanks
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