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Old 16th July 2014, 05:27 AM   #4031
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There is a via really close to gain switch. Check that it is not shorted to switch casing.
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Old 16th July 2014, 06:04 AM   #4032
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Quote:
Originally Posted by zoidbergslo View Post
There is a via really close to gain switch. Check that it is not shorted to switch casing.
Thanks... I knew I'd seen mention of some issue somewhere.
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Old 16th July 2014, 06:07 AM   #4033
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Quote:
Originally Posted by grogthegreat View Post
........Looks like Mouser put the wrong parts in the bag. I didn't measure each resistor before soldering it but I did match the manufacturer part number on each bag with the BOM.

Looks like I now have four new resistors to order!
At least you found the problem

If you want and while waiting for the parts, you can link out one resistor in each pair and see how it all sounds. It will be vastly different because 800ohms (400 with the pair) in series with the 'phones would be altering the damping and altering the response too.
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Old 22nd July 2014, 08:37 PM   #4034
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The new 1 Ohm resisters came in yesterday and I got them installed. What a huge difference! Amp is now working great. It gets plenty loud with no need for max volume or 6.5x gain.
I figured out why I didn't notice the 820 ohm resisters when I followed the initial resistance testing steps on the blog. My ohm meter was reporting the resistance as 0.819 k ohms. I didn't have the best lighting and failed to notice the 'k'. Since "0.819 ohms" was within .2 of 1 ohms I thought that I was good and moved on. Lesson learned!
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Old 23rd July 2014, 06:11 AM   #4035
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Its easily done Great to hear that you have it all working OK
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