14-01-2020, 07:32 AM
Amie, I'm sure you already know this but there are a number of E series valves that have 300mA heaters. Hence they are used in both series and parallel designs. The EF80, EB91 and ECC81/2/3 are examples. The ECC81/2/3 are unusual in having an extra heater pin so they can be used as 6.3V 300mA or 12.6V 150mA.
There are also a few 300mA valves where the heater voltage is less than 6.3V. For example the PC97 UHF tuner valve has a 4.5V heater. You're unlikely to damage one by connecting 6.3V to it for a short period.
There are also a few 300mA valves where the heater voltage is less than 6.3V. For example the PC97 UHF tuner valve has a 4.5V heater. You're unlikely to damage one by connecting 6.3V to it for a short period.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
