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RM100 biasing tubes question
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<blockquote data-quote="supercop9907" data-source="post: 1952" data-attributes="member: 179"><p>Hey everyone I'm new here and the RM100m is my first tube amp. Checking the bias on the tubes seemed pretty simple and straight forward, but when I plugged my voltmeter in it read that each tube was biased at around -15mA. The manual for my voltmeter said that if there was a hyphen (-) in front of the number it meant that the polarity was reversed. Anybody know what that means? The EL34's should be around 30-35 mA correct? Any reason why they would come biased at 15 mA?</p><p></p><p>Any help would be appreciated. Thanks</p></blockquote><p></p>
[QUOTE="supercop9907, post: 1952, member: 179"] Hey everyone I'm new here and the RM100m is my first tube amp. Checking the bias on the tubes seemed pretty simple and straight forward, but when I plugged my voltmeter in it read that each tube was biased at around -15mA. The manual for my voltmeter said that if there was a hyphen (-) in front of the number it meant that the polarity was reversed. Anybody know what that means? The EL34's should be around 30-35 mA correct? Any reason why they would come biased at 15 mA? Any help would be appreciated. Thanks [/QUOTE]
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RM100 biasing tubes question
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