21-04-2017, 03:04 PM
It's been suggested that the modifications were carried out by a Pye engineer, after all the set came from Cambridgeshire. There's no doubt the interlace filter is similar to the circuit employed in the Pye FV1 and that square screening can is a Pye component. Also, a Pye engineer would be familiar with the EF50 RF pentode. Evidently the Z66 pentode wasn't all that good even though it is similar to the Mazda SP61. Both the Z66 and SP61 are greedy for heater current, 0.63amp is not good, EF50 is better at 0.3amp.
Geordie McBoyne.
Geordie McBoyne.
