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Audio and Video Talk
Valves / Vacuum Tubes
GE 7581a tube anyone?
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<blockquote data-quote="Ampdog" data-source="post: 861461" data-attributes="member: 144"><p>Before some confusion sets in:</p><p></p><p>Types 7581A, 7027 and 6L6GC are direct equivalents for all practical purposes, except that the 6L6GC Pa = 30W compared to the other's 35W. There are some differences in maximum voltages. The 7581 'specially made for audio', cannot now find any reason e.g. more ruggedised as I seem to recall from a descrioption ca. 1960. They are all beam tetrodes.</p><p></p><p>Type 6(Pi)3S is also about the same, but with lower Pa = 19W, thus about the same as the first 6L6s - lower than 5881 (little data obtainable). Also a beam tetrode.</p><p></p><p>Type 7591 is quite different. It is a power pentode (not beam tube) quite similar to the EL34, but with Pa=19W maximum only, heater current 0,8A. (Not sure that it fits anywhere in this thread topic.)</p></blockquote><p></p>
[QUOTE="Ampdog, post: 861461, member: 144"] Before some confusion sets in: Types 7581A, 7027 and 6L6GC are direct equivalents for all practical purposes, except that the 6L6GC Pa = 30W compared to the other's 35W. There are some differences in maximum voltages. The 7581 'specially made for audio', cannot now find any reason e.g. more ruggedised as I seem to recall from a descrioption ca. 1960. They are all beam tetrodes. Type 6(Pi)3S is also about the same, but with lower Pa = 19W, thus about the same as the first 6L6s - lower than 5881 (little data obtainable). Also a beam tetrode. Type 7591 is quite different. It is a power pentode (not beam tube) quite similar to the EL34, but with Pa=19W maximum only, heater current 0,8A. (Not sure that it fits anywhere in this thread topic.) [/QUOTE]
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Audio and Video Talk
Valves / Vacuum Tubes
GE 7581a tube anyone?
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