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Mini Karlsonator (0.53X) with Dual TC9FD's
Mini Karlsonator (0.53X) with Dual TC9FD's
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Old 14th January 2018, 07:52 PM   #2391
Skylar88 is offline Skylar88  South Africa
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Quote:
Originally Posted by Lingwendil View Post
That's a fantastic looking amplifier!

Any details on how you did the heatsink/enclosure setup?

The enclosure construction is really very simple. So far I've just bolted aluminum plates to the underside and rear with 3mm bolts which fit into holes drilled and tapped into the heatsinks. I'll add a 6mm aluminum faceplate to the front and the top will get a 1.2mm alu plate that will be recessed to fit flush with the top of the heatsinks. That's about it. I may send the heatsinks in to be anodized and all the aluminum plates except the front will then also get a coat of paint.
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Last edited by Skylar88; 14th January 2018 at 07:57 PM.
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Old 14th January 2018, 08:37 PM   #2392
freddi is offline freddi  United States
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Mini Karlsonator (0.53X) with Dual TC9FD's
what a beautiful heatsink/enclosure - your upcoming aluminum face-plate and top will look fabulous. What is used for the cap multiplier voltage reference? - (I've always liked cap multipliers in tube preamp PS better than feedback regulator)
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Old 14th January 2018, 09:55 PM   #2393
xrk971 is offline xrk971  United States
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Mini Karlsonator (0.53X) with Dual TC9FD's
That’s the Juma cap Mx circuit. Simple IRFP240, 10k, 220R, 1.5R, 220uF cap to be Mx, 1uF film snubber cap, 1N4004, 4700uF output.

Juma's Easy-Peasy Capacitance Multiplier
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Old 15th January 2018, 03:10 AM   #2394
perceval is offline perceval  Taiwan
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I have some thin plywood of 3 and 5 mm thick.

I think I will try that for a 0.53x mini-K. I got the 4 TC9s in storage, so, might as well put them to good use!

PS. The 0.53x diagram in the first post is still up-to-date? Just checking, as I got burned on my 0.4x build, following the wrong dimensions...

Last edited by perceval; 15th January 2018 at 03:17 AM.
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Old 15th January 2018, 06:27 AM   #2395
Skylar88 is offline Skylar88  South Africa
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Quote:
Originally Posted by xrk971 View Post
Thatís the Juma cap Mx circuit. Simple IRFP240, 10k, 220R, 1.5R, 220uF cap to be Mx, 1uF film snubber cap, 1N4004, 4700uF output.

Juma's Easy-Peasy Capacitance Multiplier

Yes, it's Juma's Cap Mx and this is a diagram for two-channels that I adapted from the one in that thread. I used IRFP250 because it was cheaper and more readily available.
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