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Heater Grounded?

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Commando

Post subject: Heater Grounded?

Posted: Thu Oct 23, 2008 6:34 pm

Friend

Joined: Fri Dec 15, 2006 5:07 am
Posts: 21
Location: Oakville Ontario

Should I be able to measure a short between one of the heater wires (pin 7 on the 6v6 and pin 5 on all the other tubes) and ground? I only get this when one of the 4 output tubes on my V6 is plugged in.
Is this normal?

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coco

Post subject:

Posted: Thu Oct 23, 2008 7:55 pm

Holy Ghost

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada

I dont think so. Not Zero ohms anyway. Heaters are an independent circuit but there is a centre tap going to ground. For fun, pull the two 6V6 & see if it exists.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

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coco

Post subject:

Posted: Thu Oct 23, 2008 9:47 pm

Holy Ghost

Joined: Sun Mar 13, 2005 4:10 pm
Posts: 7519
Location: Canada

I measured a new 18 watt Plexi build here - 0.2 ohms from pin 4/5 or 9 to ground and it works fine with about 6.5 VAC on the heater. But not a dead short. That will blow a fuse I expect.

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Stephen
Web: www.trinityamps.com. Facebook: facebook.com/trinityamps. Twitter: @trinityamps

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