Rockster tubes

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JoeCon
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Rockster tubes

Post by JoeCon »

Guys
A friend has my KT66 Rockster at his place. He wants to know if he can put in a pair of EL34s. It's got 375v on the plates and of course is cathode biased.
Can he just put his tubes in? Will the cathode resistor need to be changed to run the 34s?

Thanks...
In theory, theory is the same as practice. In practice it's different.
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martin manning
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Re: Rockster tubes

Post by martin manning »

From data sheet, EL34 cathode resistor for 375V is ~260 ohms/tube, 130 ohms for a pair.
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JoeCon
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Re: Rockster tubes

Post by JoeCon »

Martin
Thanks, there's a 200 ohm in there so he's safe to try them, but they're not gonna be running optimised...
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