Papa sez that he likes Silmics ; so - use them whenever you can , instead bigger electrolyts
for all smaller in value - use solid caps ; evaluate them by size of your pocket , but don't feel pain if you can't buy expensive ones
for all smaller in value - use solid caps ; evaluate them by size of your pocket , but don't feel pain if you can't buy expensive ones
finding 10uF coupling caps of the appropriate size to replace the original Mylars (?) will be a chore. For my FET-10/HL, I was able fit in Wima polycarbonates by mounting them sideways.
I would leave original mylar caps in , and just bypass them with 10nF ( and up ) polycarbonats (MKC)
Amusing bit : last weekend i saw several valve endeavours at the ETF, that included ERO MKT1813 Greenies. 
I would not use Silmics in power supplies, only in signal path if required.
They are audio grade and have short lifetime (1000hr at 85C)
For power supplies I like Panasonic FC series.
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