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Old 3rd December 2011, 12:21 PM   #11
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Here's one of the prototyping setups, good for testing all sorts of simple circuits:
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Old 3rd December 2011, 12:25 PM   #12
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Here's how I did my point-to-point wiring. No excuses now first-timers!:
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Old 3rd December 2011, 12:28 PM   #13
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Here's a pic of my negative voltage reference on perfboard:
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Old 3rd December 2011, 12:30 PM   #14
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Here's what the chassis looks like without the side panels. There's no metal work in this project other than the heatsinks:
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Old 3rd December 2011, 12:36 PM   #15
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On the subject of heat sinks, I used some big old Thermalloys drilled for TO-3, but I know they're hard to come by, so I tried this arrangement for you, dear reader. This is a small bracket made from aluminum angle purchased at Home Depot bolted to my favorite T-Slot heat sink from Newark. It works just fine:
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Old 3rd December 2011, 12:41 PM   #16
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And, some random pics:
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Old 3rd December 2011, 12:55 PM   #17
crt is offline crt  Indonesia
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Wuih, i only can say ==> WONDERFULL !
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Old 3rd December 2011, 12:59 PM   #18
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Great Stuff.. Michael.. Just ordered some SK82 to try out.. My spks are 16 Ohm.. do I need to change any values ? Thanks
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Old 3rd December 2011, 01:09 PM   #19
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Quote:
Originally Posted by Michael Rothacher View Post
And here are some of the bonus materials.

Here's a pic of the makeshift curve tracer I used:


FAHNSTOCK CLIPS! Love it!
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It's not about what you can BUY...It's about what you can BUILD!
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Old 3rd December 2011, 01:34 PM   #20
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Quote:
Originally Posted by BTW View Post
Great Stuff.. Michael.. Just ordered some SK82 to try out.. My spks are 16 Ohm.. do I need to change any values ? Thanks
It's a great question. You can certainly try it as-is and it will work, but if you build Figure 10 with an adjustable supply, you'll be able to fine tune things more readily.

For those without distortion analyzers, I'll soon post a table of operating point values for different loads assuming a 50-55V supply. Give me a week or so. We'll also play with the number of bulbs for good measure.

Last edited by Michael Rothacher; 3rd December 2011 at 01:38 PM.
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