Express some little issues.....

Express, Liverpool, Rocket, Dirty Little Monster, etc.

Moderators: pompeiisneaks, Colossal

redshark
Posts: 822
Joined: Sun Dec 07, 2008 12:42 pm
Location: Veracruz, Mexico

Re: Express some little issues.....

Post by redshark »

passfan sorry I just erased my last posting because it was embarrasing, LOL
I don't have any electronic background so I was reading voltages in my express and it made me curious that my heather voltage was 3.5vac. So I posted the question if my amp had a problem. When my roomate showed up I asked same question and when I showed him the reading he laughed and told me u only read dc to ground and not ac and that is why my voltage was only half/// :oops: Live and Learn!!!!
passfan
Posts: 1353
Joined: Sun Jan 10, 2010 2:01 pm
Location: Central Florida

Re: Express some little issues.....

Post by passfan »

redshark wrote:passfan sorry I just erased my last posting because it was embarrasing, LOL
I don't have any electronic background so I was reading voltages in my express and it made me curious that my heather voltage was 3.5vac. So I posted the question if my amp had a problem. When my roomate showed up I asked same question and when I showed him the reading he laughed and told me u only read dc to ground and not ac and that is why my voltage was only half/// :oops: Live and Learn!!!!
Well the correct term would be the center tap as in 3.5-0-3.5 , 0 does not necessarily mean ground. And , you must have a complete circuit to read any voltage. For example my heater circuit is elevated off my B+ at the first preamp tube so my 0 center tap point is +35 volts DC. My heaters don't care because all they see is the difference in the winding of 3.5-+35-3.5 . It's still only 7 volts between legs so , ground means 0 volts at earths potential and not the center tap of a transformer unless you send center tap to ground.
Just remember not to ground yourself and everythings cool. 8)
"It Happens"
Forrest Gump
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