by mick <not.here@[EMAIL PROTECTED]
>
Apr 24, 2008 at 10:55 AM
On Thu, 24 Apr 2008 07:37:08 +0300, Iain Churches wrote:
<snip>
> One point is still unclear to me. If the current regulator is set up for
> say a pair of 12AU7 in parallel (6V3 heaters at 0.3A) and one heater
> fails, will the current limiter "force feed" the other heater with the
> whole 600mA ?
>
If it *was* a current regulator (which it isn't) then yes, it would. The
output voltage of a constant current source will increase to try to reach
the designed current. If you want to use CC feed then you must use a
separate source for each valve or run similarly *current* rated valve
heaters in series - *never* in parallel. (The types carrying part numbers
like UF80, UCL86 etc. were all designed for constant current running at
100mA, so the heater voltages are all over the place!)
--
Mick (Working in a M$-free zone!)
Web: http://www.nascom.infohttp://mixpix.batcave.net
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