Different voltage ratings.

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Hi,
for an 18Vac + 18Vac transformer set up, the 25Vdc capacitors recommended are going to be right at their working limit. At peak voltage the caps will see about 27Vdc.
I would recommend you jump to 40Vdc for this use.
The main disadvantages are the increased size and cost of the caps.

The first stage smoothing will suffer very high ripple current, so take care to select suitable caps for this duty. Lots of smaller caps will usually give increased ripple capacity and sometimes cost less as well. And keep them cool, not so easy in a ClassA amplifier case.
 
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