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PostPosted: Fri May 15, 2020 12:09 am 
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Joined: Sat Dec 04, 2010 3:42 pm
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Location: Qualicum Beach, BC
Electrically, there's no right or wrong way to install the switch. It just depends on which way you want the handle to point for each setting.

The layout drawing is correct. The labels show which way the bias switch handle will point for each setting. The labels are opposite to which terminals are connected though.

Your drawing is correct, too. The handle points opposite to the terminals that get connected. This can be easily verified with an ohmmeter. Just see which way the handle points to connect the center terminal to the outer ones.

Quote:
coco wrote:
Note: If the amp is fitted with KT66s and the switch moved to the 6V6 position, that could damage things, since KT66s require a higher bias voltage. With 6V6s, there is no danger with the switch in either position, although the amp won't sound its best, since the internal voltages will be a little too high.


I'm not sure about this either but I would hate to disagree with Stephen. KT66 gets higher B+ than 6V6. Hotter bias too, as far as I know, but I don't have a Triwatt to verify this. So I would think KT66 wouldn't get damaged on the 6V6 setting. 6V6 might not like the KT66 setting, though.


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