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EL34 vs. 6L6GC vs. 7591 ? Truth - Who's Best !

Tom Bavis said:
Maybe the reverse - they wanted more difference between the 400 and 500C - so that people would spend the extra $100 or so for noticeably more power. Earlier 400s were pretty close to the 500C in output, though couldn't go as low. They may have extended the low end a little with the higher-Z transformer.
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For guitar amps, the range of manufactured output transformers for tube amps became more limited as the 1960s progressed. So you started seeing cross-referenced, updated, or substitute part numbers for those amps.
 
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