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My favorite eBay supplier :
4X 0 68 uf 500V Russian Hybrid PIO Capcitors K75 10 New | eBay
You will need four caps. With 500 volt rated caps, they are reusable in DIY tube amps, I have them where I can fit them in my SET 45 amps, as a bypass. :-)
If your stock ALTEC crossovers have the original stock caps in them, ( Pyramid ?? as I recall ) the stock ALTEC film caps of that era are a very weak link and should be replaced. Before doing so, just parallel across each stock 18uF cap, a 0.68 uF K75-10 0.68 / 500V., and LISTEN to what that does. Gain direct listening experience for yourself.
Its NOT $800 for four caps either !! Under 25 dollars shipped !!
re: Biamping : IMHO, IF ( a big word, my Daddy told me ) you have really good amps, you are best-off using a good passive speaker-level crossover, and having ONE amp's time constant and signature on the A7. Especially if you know how to build a good SET with zero negative feedback, and a great power supply. KISS rules, in highest-end audio. The best amps I have heard on ALTECS will all be under five watts, under $20K, two stage, always direct coupled, with LOTSA performance capability in the milliwatt range.
Have fun.
Jeff
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