Origin 20h valves replacement

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Hello

I want to exchange valves in my Origin 20h, ordered some from Tube Amp Doctor. After I exchange them do I have to rebias it? Is there a manual for rebiasing? I wasn't able to find anything which would give me even slight bit of a hint about it .

thanks

iosman

edited 06 Aug 2019 at 07:59 AM

asked 07 Jul 2019 at 06:13 AM

Answers: 1

Hi IOS,

Thank you for your message, the Origin 20H has a fixed biased so no need to rebias this amp.

Marshall Support

answered 08 Jul 2019 at 11:05 AM

Hi, you meant that is cathode bias? Because fixed bias heads needs to be revised when you swap tubes... - 28 Jun 2020 at 04:45 PM

You do not need to bias the amplifier when replacing the power valves - 01 Jul 2020 at 10:52 AM