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Old 12th Mar 2021, 2:09 pm   #4
Silicon
Nonode
 
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,152
Default Re: R1155 power supply unit

I would not connect that power supply to the R1155 until it was fully tested. It could burn out all the valve heaters! The chassis may be live.

Home made power supplies were often made to very poor standards by people with very little technical knowledge.

One possible reason for the high HT voltage could be that the mains transformer was designed for a different supply voltage.

Some sites may have used 110V AC for safety reasons. Mains supplies of 200V and 220V AC were common. Some were 25 or 40 Hz AC.

I would load the power supply by connecting high power resistors to the HT and heater outputs.
Measure the heater output voltage first. Power it up for a few seconds only.
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