I back my tubes up. The pictures shows a Mullard 5AR4/GZ34 Grey plate rectifier tube 100 each side NIB NOS! These are well regarded early Chinese production. Price reflects demand. Tube Tester Scale reads.
Item Tag: ARS
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ARS (CHINA) KT88/6550 POWER TUBE Used Tested 83 #1014-9
ARS (CHINA). KT88/6550 POWER TUBE. Mutual Conductance Tube Tester. The item must be as received & unopened. Hi-Fi Heaven.