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Bulging Capacitors

70.71.27.156

57chev

I have a Moth 2a3 tube amp. After taking the top cover off to tighten a RCA plug that came loose, I notice the tops of 4 out of 5 power supply capacitors were bulging/ballooned out. Should I have any concerns on this? What would cause this. The amp is working 100% fine.
The cap. values are 220uF/450V. If I do change them out, should I change for higher value say 330uF/450V? Will it make any audible improvements?

Follow Ups:

RE: Bulging Capacitors - 57chev 20:50:19 04/06/09 (0)
I just replaced the caps with 330uf/450V 105C* my old caps were rated at 105C* I couldn't fine any higher temp. rating one. Amp works fine.
RE: Bulging Capacitors - AbeCollins 16:00:41 04/06/09 (0)
If anything, I would consider replacing with higher voltage and temperature rated caps. More capacitance might just be icing on the cake but not the main concern with bulging caps, IMO.
RE: Bulging Capacitors - gymwear5@hotmail.com 11:00:29 04/06/09 (0)
I had to replace bulging caps that had failed - yours are on the way - in my Mitsu Rear proj TV

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