UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - When an interest in valves becomes out of control without realising!

Maarten · 28th Aug 2019, 4:55 pm

Valves would go into small electrical, though they're not extremely polluting when you just throw them in the trash. However, I hope even the TV valves fetch some interest. Often, they're a good alternative for audio valves that had their prices driven up. A set of PL36, PL500, PL504, PL509 etc. make a nice push pull output stage, no need to spend money on EL34 or EL522. Keep in mind they're beam tetrodes, though. A PCL805 can be used instead of an EL86 in a SRPP output stage. Philips even did that in one of their last hybrid tv designs. PL508 might be a good choice for such a circuit as well, not sure.

28th Aug 2019, 4:55 pm	#18
Maarten Dekatron Join Date: Dec 2007 Location: Haarlem, Netherlands Posts: 4,203	Re: When an interest in valves becomes out of control without realising! Valves would go into small electrical, though they're not extremely polluting when you just throw them in the trash. However, I hope even the TV valves fetch some interest. Often, they're a good alternative for audio valves that had their prices driven up. A set of PL36, PL500, PL504, PL509 etc. make a nice push pull output stage, no need to spend money on EL34 or EL522. Keep in mind they're beam tetrodes, though. A PCL805 can be used instead of an EL86 in a SRPP output stage. Philips even did that in one of their last hybrid tv designs. PL508 might be a good choice for such a circuit as well, not sure.