Phil - the smaller cap in film sounds better than the single larger cap alone. Like all things audio, some hear it, some don't… The rule of thumb is 10% of the larger cap, use same voltage rating ! My 240 is singing for her supper ;-)
Also, if you don’t listen very loud, try light loading the output transformers but dropping down another setting on the impedence- listen also as that is the key - if it sounds better w no clipping keep it that way.
But the skeptics will ask ( fair ) how do you know ? 1961 Amp store demo came to us in 1965 and went to McIntosh clinics regularly, I remember over many many years a few tubes. I inherited it in 2001 and it finally needed another set. I put the Vintage Tube services set in 3 years ago :-) she beats her spec by 12 wpc
The 240 is very easy on tubes as long as you put good quality in AND your caps are in good shape. Like 2-4 k hours, you can see a nice rebuilt 240 on my vintage system page.
a fantastic amp and very sweet w Telefunken in the small signal. I am currently running some output tubes I got from Andy at Vintage Tube Service in Michigan, he has the chops and the test equipment to know ;-)
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