{Collins} 7543 vs 6AU6A



Anyone know the advantage of using a 7543 over a 6AU6A in the VFO of a KWM-2.
I know both will work and that the 7543 has low hum feature.
I can't tell any difference with one over the other when I exchange the one in the VFO of my KWM-2.
I am sure the answer is in the CCA archives but they are down again.
Thanks in advance,
Dan/N4VET





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