Quote:
Originally Posted by cathy_vintage
Thanks for recent replies. Yes I have a mains 1kVA isolation transformer and various 'Variacs', so that I can gradually 'wind up' the voltage, after I have isolated the secondaries. I am surprised that the Trader Sheet doesn't quote AC secondary outputs. Always used to ask our 'trainees' How come you can get greater than 240 vac out of a Variac given that the input voltage is measured at 240v? Used to cause some head scratching that one, as they assumed it's just a simple potential divider (which it isn't) ! If I add power resistors to 'load' the output windings, then what is a realistic current to draw to give the Tx a 'bench soak' before proceeding any further ? Adding up the anode currents I was thinking 60 mA for the HT winding or is this too simplistic or excessive? I won't do anything without the blessing of you guys.
|
The transformer's secondary voltages can be derived from the Trader sheet, the rectifier's anode voltages are given in the "Valve Analysis" section, they're are quoted as 264 volts AC per anode, that's 264-0-264 volts at the transformer's HT secondary connections, the unloaded voltage will be a bit higher.
The heater winding voltages can be derived from the heater voltages of the valve types used, here's one of the bibles for online valve data:
http://www.r-type.org/index.htm
EDIT: Here's the other bible:
http://www.shinjo.info/frank/
Lawrence.