Hello Trevor; Not actually sure, if you have trader sheets It is the same variant as in sheets numbered 1715, 1755 and 1801. I was also told it is used in am STC/KB VC4, but there are some component value differences from all of them.
Hello Jeffrey; Well the PCF801 was to air, so had to get replaced and as I am building a system based on a 6.3 Volt parallel heater string then it makes sense to me.
Adrian
Missed the bit about the manual gain pot, yes it just seems easiest at present, and it should allow me to determine a the level before, the line in the spec about the supply current does strike me as extremely high for the two valves.
Hello Jeffrey; Well the PCF801 was to air, so had to get replaced and as I am building a system based on a 6.3 Volt parallel heater string then it makes sense to me.
Adrian
Missed the bit about the manual gain pot, yes it just seems easiest at present, and it should allow me to determine a the level before, the line in the spec about the supply current does strike me as extremely high for the two valves.
Learning as I go!
Youtube EF91 Valve
Youtube EF91 Valve
