What kills a valve rectifier?
On Fri, 27 May 2011 17:37:43 +1000, Phil Allison wrote:
"Arfa Daily"
The 5U4 appears to be able to handle more current, but at a lower max
plate voltage. Also, the heater requires substantially more current.
Might be an issue for the transformer supplying it ?
** Very unlikely to matter.
Say the winding is rated at 5 volts and 2 amps to suit a 5AR4 and the
copper wire is gauged to give about 10 % regulation factor. Then the
heat loss in the 5 volt winding is 10% of the load power or about 1
watt.
If a 5U4 is subbed - the extra 1.1 amps will mean that 5.0 volts drops
to 4.7 volts - well within specs for the valve.
The extra heat in the winding amounts to 0.8 watts - which is trivial
in a tranny designed to lose 15 to 30 watts as heat in normal operation.
..... Phil
Good to see the real Phil back for a little while.
--
Live Fast Die Young, Leave A Pretty Corpse
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