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Old 29th Nov 2022, 3:00 pm   #12
jjl
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Join Date: Jan 2003
Location: Ware, Herts. UK.
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Default Re: Combined power-pentode and double-diodes?

I believe that the Czechoslovak TESLA company continued to produce radios with the ECH21, ECH21 EBL21 plus rectifier line-up and / or series heater variants long after Philips had moved on from this type of design.
Perhaps Polish or other eastern manufacturers did likewise.

John
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