Thread: "Black" PL81s
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Old 6th Sep 2009, 8:03 pm   #5
Boom
Retired Dormant Member
 
Join Date: Jan 2007
Location: Westbury, Wiltshire, UK.
Posts: 2,451
Default Re: "Black" PL81s

I've spent the afternoon sorting my 'U' valves out and trying them out in a test set. I have several UL41s all which look terrible with black and brown thingies all over the inside of the glass but they all work fine with no hum either.

You can't tell anything at all by looking at them.

Dave
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