Thread: EF91 to EF80
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Old 18th Jun 2019, 7:33 pm   #4
Nuvistor
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Location: Wigan, Greater Manchester, UK.
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Default Re: EF91 to EF80
The EF80 has similar ma/v for a lower anode and screen supply, 170v as opposed to 250v, this would be useful in AC/DC sets were mains voltages could be as low as 200v.

That’s just a guess though.
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