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Old 13th May 2013, 06:20 PM   #5101
tomchr is offline tomchr  United States
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Quote:
Originally Posted by donnyab View Post
are they your own pcbs ?
Yep. They're for sale on my website.

~Tom
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Old 14th May 2013, 06:31 PM   #5102
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Do you have measurements by any chance?
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Old 15th May 2013, 02:32 AM   #5103
tomchr is offline tomchr  United States
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0.2 % THD @ 1 W, 1 kHz
10 W @ 3 % THD, 1 kHz
Bandwidth (1 W, -3 dB): 7 Hz - 32 kHz if memory serves.

I'll follow up with THD plots at some later date in the Damn Good 300B thread: DeathTrap400 : : A Pretty Damn Good 300B Amp
I need to get my measurement scripts tidied up first, though.

~Tom
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Old 17th May 2013, 07:08 PM   #5104
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Just finished up a special Bottlehead Crack build I call the Coppermine Crack. This build took a bit of work: I mitered and routed the wood base, then copper leafed it, which is a fun experience if you haven't tried it. The plate of the amp is 12" x 12" x 0.1" copper. Some changes from the stock build are the 6SN7 signal tube, the excessive use of film caps for power and coupling, and a pair of oversized chokes. Hope you enjoy the pics.

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For a detailed rundown of the build and more pics, visit:
DIY Audio Electronics from Zynsonix.com: Bottlehead Crack Coppermine Edition
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Old 17th May 2013, 07:15 PM   #5105
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Sweet.
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Old 17th May 2013, 10:18 PM   #5106
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Quote:
Originally Posted by HiGHFLYiN9s View Post
Just finished up a special Bottlehead Crack build I call the Coppermine Crack.
Exquisite.
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Old 17th May 2013, 11:41 PM   #5107
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Very nick where did you get .1 copper at 40 dollars ? every
I go it closer to 70.
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Old 18th May 2013, 05:31 AM   #5108
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Hi Thom. If I recall correctly it was listed on Amazon. Shipping ran a little extra though as it was a third party seller.
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Old 18th May 2013, 05:55 PM   #5109
tomchr is offline tomchr  United States
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I like the copper. Did you do anything to prevent it from tarnishing? Clear coat?

~Tom
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Old 18th May 2013, 11:56 PM   #5110
AJT is offline AJT  Philippines
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^a thin coat of clear lacquer varnish....this is what i use on my pc's...
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