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Modular Amps
Egnater / Randall Modular Amps
What values do you bias kt77's and kt88's
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<blockquote data-quote="Kapo_Polenton" data-source="post: 111193" data-attributes="member: 2642"><p>KT77's are supposed to bias in the same range as EL34's and KT88's closer to the 6550 range. That said, in theory you should start with your plate voltage in order to get an idea of what 70% of the tubes operating range will be. I am sure you could find out what Randall's plate voltage is but I would guess somewhere around the 400 range. But generally speaking EL34's will be in that 35-45 mA range without getting too crazy hot and burning out. USe something like this to get an idea: http://www.rogb.dk/tools/bias.html</p><p></p><p>I have my 6550's in my Marshall running at about 53 mA but plate voltage was 367.</p></blockquote><p></p>
[QUOTE="Kapo_Polenton, post: 111193, member: 2642"] KT77's are supposed to bias in the same range as EL34's and KT88's closer to the 6550 range. That said, in theory you should start with your plate voltage in order to get an idea of what 70% of the tubes operating range will be. I am sure you could find out what Randall's plate voltage is but I would guess somewhere around the 400 range. But generally speaking EL34's will be in that 35-45 mA range without getting too crazy hot and burning out. USe something like this to get an idea: http://www.rogb.dk/tools/bias.html I have my 6550's in my Marshall running at about 53 mA but plate voltage was 367. [/QUOTE]
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Modular Amps
Egnater / Randall Modular Amps
What values do you bias kt77's and kt88's
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