Hi Troels
After several months of sporadic evenings spent in my garage, I have
finally finished the SBA 761’s and I am thoroughly over the moon with
them. I had trouble finding 20mm b/bb grade Baltic birch plywood
locally in the UK and in the end had to settle on 24mm, but following
your advice I maintained the front panel dimensions and increased the
depth on the back to maintain the specified volumes. Front panels were
of 20mm Valcromat which I recessed into the main cabinet panels to give
them a thinner profile when viewed from the side. I tried lacquering the
fronts at first but I couldn’t get a finish I was happy with so I ended
up paying for them to be sprayed.
I chose the 761’s to go with a low powered 6CY7 valve amp I built using
schematics created by Matt at Cascade Tubes. The amp puts out
around 1.3 watts per channel into 8ohms so I needed an easy load and
something more sensitive that the current bookshelf speakers I had been
using. I have now listened to around 10hours of music and although they
still need more time before they are at their best, I am already
completely smitten by them. My little amp has no trouble driving them
and they sound wonderful.
Thank you for all your wonderfully detailed instructions, tips and
ideas, you have made the whole project possible.
Malcolm
UK
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