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PCB design techniques for Tube Amps
PCB design techniques for Tube Amps
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Old 28th July 2013, 07:54 PM   #21
12E1 is offline 12E1  United Kingdom
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Originally Posted by roline View Post
...I solder all eyelets to the traces and no problems.
Thanks. I guess it's down to understanding the issues (as you clearly do) and taking sufficient care with the joints. Interesting stuff.
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Old 29th July 2013, 08:07 PM   #22
tomchr is offline tomchr  Canada
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I use double-sided PCBs all the time. I oversize the pads and traces to prevent lifting. My boards survive multiple rework operations without peeled traces. The through plating also helps against trace lifting.

A PCB beats point-to-point wiring in repeatability hands down. And a properly laid out board will perform as good or better than point-to-point wiring simply because the board can easier be optimized with respect to signal integrity.

For prototypes I make double-sided (not through-plated) boards using toner transfer. With those I do sometimes run into trouble with lifted pads or traces resulting from repeated rework. But most of the time the issues are caused by a slight slip between the top and bottom layer artwork throwing the registration off by maybe 0.25 or 0.5 mm. It's good enough for prototypes and one-off kinds of jobs, but for anything else, I'd go with a professionally fabricated board.

Modulus-86: 40W/8Ω @ 0.000061% THD. HP-1: 3W/20Ω, 450mW/300Ω @ 0.000032% THD. DG300B and Other Tube Circuits.
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