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Old 22nd May 2004, 05:42 PM   #1
G is offline G  United States
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Default Heater winding load question.

Hi all,

I'm about to heat up the soldering iron and start the final circuit construction of my new SE EL34 amp but I have a question about the heater winding load for you accomplished designers and builders. The current capacity of the heater winding on my power transformer is 8 amps. The load I will be putting on it is only 4 amps total. Is this load big enough that I won't have a high heater voltage (higher than 6.3v) or should I incorporate a couple of power resistors in there as sort of a preemptive precaution?
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Old 22nd May 2004, 07:20 PM   #2
EC8010 is offline EC8010  United Kingdom
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Your heater voltage will be a gnat's high, but you will be surprised at the voltage drop along your heater wiring. There's only one way to find out. Do it and measure. I doubt if it will be much out.

Your options if there is a significant error are somewhat limited. Mains voltage varies, so you would need to know the voltage going into the transformer precisely before fiddling.

Suck it and see.
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Old 22nd May 2004, 07:30 PM   #3
dhaen is offline dhaen  Europe
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I'd guess at about 5% higher than full load.
this is well within experimental tolerances.
As EC8010 recommends, don't worry about it at this stage. It could be that the heaters end up exactly right because of other factors. Alternatively they might just end up 10% high, in which case do something - but later.
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Old 22nd May 2004, 07:40 PM   #4
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Thanks guys. I can smell the solder fumes now. Cheers.
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