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Another KT-88
Another KT-88
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Old 29th July 2008, 03:44 AM   #1
cryo is offline cryo  United States
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Default Another KT-88

I promised some time ago to post a final finished picture and also a shot of the undercarriage. I am a bit nervous showing the underside of my amp, kind of like dropping my pants on stage.

But I can take positive criticism. This is my version of Michael's KT-88 single ended circuit. I got a lot of help from people on this forum, and I thank them from my heart.

And now on to the next project........
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Old 29th July 2008, 03:45 AM   #2
cryo is offline cryo  United States
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Default Kt-88

And the undercarriage......
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Old 29th July 2008, 03:55 AM   #3
despotic931 is offline despotic931  United States
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Beautiful!

How's it sound?

What's the power output?

And, what wood is that base made of?

-Justin
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Old 29th July 2008, 04:32 AM   #4
jimmyd53 is offline jimmyd53  United States
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I second that. Very nice work.
James
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Old 29th July 2008, 05:20 AM   #5
Rodmunch is offline Rodmunch  United States
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Absolutely gorgeous. What does something like that cost to build? How's it sound?
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Old 29th July 2008, 09:05 AM   #6
Hearinspace is offline Hearinspace  Canada
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Another KT-88
I triple that. Beautiful from both sides! Love the clean layout and wiring, top-plate cutouts , the whole thing . . . . .and that base is gorgeous!
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Old 29th July 2008, 09:18 AM   #7
Simpleton is offline Simpleton  Portugal
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Trully a work of art!
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Old 29th July 2008, 09:44 AM   #8
ymwong is offline ymwong  United States
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Another KT-88
Wow, love that sloped base. And the finish! 1st class.
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Old 29th July 2008, 02:01 PM   #9
jrn77478 is offline jrn77478  United States
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My compliments as well. Very nice work, especially the chassis design. I may have to... erm, borrow that.
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Old 29th July 2008, 02:40 PM   #10
cryo is offline cryo  United States
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Thanks for the responses, my head is sufficiently swollen.

It sounds great. It only puts out a few watts, but I have two-way bookshelves that it pushes very nicely. Plenty of power for a bedroom, office, etc. I now understand the leanings toward single-ended sound.

The base is bubinga, 45 degree miters on the ends, with about a 15 degree compound angle to get the sloped sides. That took a bit of tweaking, and I set up a jig on my disk sander to get it just right. After a few dry runs on pine, I finally did it in the expensive bubinga.

I have tried a lot of fancy finishes. But in the end I really like Deft's spray on polyurethane. You have to have a clean place to spray, you can't rub out any imperfections. But it goes on nice and you are done.

It doesn't show on the pic, but there is a perforated aluminum sheet inset into the bottom to keep fingers away from 400 volts DC.
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