Quote:
Originally Posted by Boom
Ra is 230k for UL84 but Valve Museum doesn't give RA for UCL83. I got away with it for years though modding mates record players as they never were very loud until I upgraded/bodged them with a UCL83. I think that there is a couple of volts heater difference between the two valves also.
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Ra is pretty much irrelevant here, R
L is the useful value. (Though the datasheets are sometimes a bit vague about which is which!)
UL84 about 2.5k, UCL83 about 5k for ideal load. In practice, just using 2.5k on a UCL83 won't make a vast difference. UCL82 also about 5k but would give more grunt than the UCL83.