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Old 19th November 2012, 02:51 PM   #4481
GordonW is offline GordonW  United States
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I never got around to posting pictures to this thread, until now. Better late than never, I guess.

As I get time and the necessary combinations of parts and materials, I build amps in my home workshop. Mostly on a hobby basis- but I have wound up building and selling, both after-completion and on prior commission, various amps, over the last six years or so.

I tend to build mods and improved versions of some of the classic designs. As the great Isaac Newton said: "If I have seen further it is by standing on the shoulders of giants." Some of these older-generation designers were quite gifted- by learning and using the ideas they created, it paves the way for me to create my own ideas...

First off, the first amp I built from scratch. As in drawing the schematic, putting together the parts lists, punching and drilling the chassis, and assembling the parts. It's based on the classic Magnavox paraphase PP circuit, using 7C5 (loktal version of 6V6) output tubes:

Click the image to open in full size.

This started out as a blank rack-mount chassis, which I punched, drilled and painted. Power transformer was from a large color TV, and output transformers were from a Knight integrated amplifier (a bit heavier than the original Magnavox transformers, and with 4, 8 and 16 ohm taps). Input tubes are 12AX7s.

Click the image to open in full size.

In all, a satisfying 12 watts per channel.

Regards,
Gordon.
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File Type: jpg loktalmaggie1.jpg (50.3 KB, 1219 views)
File Type: jpg loktalmaggie4.jpg (56.5 KB, 1212 views)
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Last edited by GordonW; 19th November 2012 at 03:09 PM.
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Old 19th November 2012, 02:59 PM   #4482
GordonW is offline GordonW  United States
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Sort of keeping a chronological order- my second scratch-built amp was based on a recovered Pilot SA232 chassis (it had been in a fire). Chassis was stripped, polished, and re-drilled to fit the new components.

Click the image to open in full size.

The amp is loosely based on the Stromberg-Carlson ASR333, except simplified. This is an integrated amp, with three inputs, a 6CG7 input tube, 6U8 drivers and 6BQ5 PP outputs. Power transformer is again a color TV unit, and output transformers are from a hefty Seeburg jukebox, that originally used 6973 output tubes.

Click the image to open in full size.

This turned out to be a little power-house of an amp- easily 17w/ch or more, with prodigious low bass output and quality. A friend of mine wound up with this amp- it actually booted an Audio Research CA50 integrated amp out of his system, if you can believe that.

Regards,
Gordon.
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File Type: jpg 10-5 amp front view.JPG (25.7 KB, 1247 views)
File Type: jpg 10-5 amp lf view.JPG (37.0 KB, 1212 views)
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Old 20th November 2012, 12:51 AM   #4483
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Congrats! very, very nice units, simple, compact, and superb classical look.
I envy Your ability to lay the wiring, and do the solder job in such a reduced space!
I think you're the guy that fellow member asking for "one skilled designer" was looking for...
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Last edited by Mosquito; 20th November 2012 at 12:54 AM.
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Old 24th November 2012, 05:01 AM   #4484
tim614 is offline tim614  United States
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Default pp kt120

Click the image to open in full size.Click the image to open in full size.
Click the image to open in full size.
pp kt120
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Old 24th November 2012, 05:32 AM   #4485
56oval is offline 56oval  Australia
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Hello Tim

Really nice looking setup . But your work bench is just to neat .

Cheers
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Old 24th November 2012, 07:15 AM   #4486
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Very nice. I love it!
What are the loudspeakers you are using? Thanks.
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Old 24th November 2012, 12:44 PM   #4487
tim614 is offline tim614  United States
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Quote:
Originally Posted by 56oval View Post
Hello Tim

Really nice looking setup . But your work bench is just to neat .

Cheers
neat!?
not all the time, that was cleaned up after i finish the amps
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Old 24th November 2012, 12:45 PM   #4488
tim614 is offline tim614  United States
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Quote:
Originally Posted by mindutis View Post
Very nice. I love it!
What are the loudspeakers you are using? Thanks.
thanks!
speakers are yamaha ns1000
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Old 24th November 2012, 12:46 PM   #4489
tim614 is offline tim614  United States
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got a new mac, so i played around and made a video
PP kt88 slide 1 - YouTube
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Old 24th November 2012, 05:58 PM   #4490
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@tim614: Clean good looking build. Your whole set-up looks good.
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