The TY86F is a television EHT rectifier and a special variant of the EY86. The EY86 has a 6.3 Volt heater at 0.09A whereas the TY86F has a 7.4 Volt heater. It was made for replacing the EY86 in certain television types such as the Furgusson 306T 17 inch set of 1956 where the line output transformer produced excessive voltage and destroyed the EY86's.
Is rated in terms of peak inverse volts (PIV) and that is quoted at 22,000 Volts. It was designed for pulse input service and to be driven from the positive peaks of the line output transformer. The rectified voltage can be about 17,000 volts. This is sufficient for a medium sized black and white TV. The maximum reservoir capacitor for use with this valve is 0.002 µF, normally the capacitance of the CRT itself is used as reservoir.
The internal construction features a shield.
The valve came complete with this stick-on label giving precise instructions on useage.
The thin glass tube envelope is 20 mm in diameter, and excluding the B9A base pins is 65 mm tall.
References: Datasheet & 4026.
Absolute Maximum Operating Conditions¶
Updated April 12, 2013.