[sdiy] Dumb coupling capacitor question

[Tom Arnold]

Greetings!

Dumb coupling capacitor question time...
I'm currently rebuilding my Dynaco PAT5 preamp as the caps have degraded to
the point where frequency responce is badly affected.  There are tons of
electrolytics in the signal path, many of which they replaced with Tantalum
caps in the PAT5-BiFet.

( schematic : http://www.dvq.com/hifi/images/pat5_sch.pdf ).

This bothers me.  SPecifically that I've been doing some reading and ( both
Harry's cap tutorial and others ) that tantalums are not the best choice
for coupling.  I'd put in film caps except in this particular circuit they
need some scary-large N.P caps, the worst one being a 60uf N.P tantalum,
which doesn't even seem to be available from *ANYWHERE* any more ( this cap
is labeled C21 on the schematic, PC-34 board, look off the output of the
only opamp there ).

If tantalums are okay, I suppose I could "make" some N.P tants and then
maybe I could have a little twin mushroom cloud when they explode...

-- 
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 - Tom Arnold       -  Free Synth DIY webspace http://www.sdiy.org 
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