TRIODES - 10
450T
450TH
VT-108
3-450A4
450TL
3-450A2
454-H
HK-454H
HK-454L
460
HF-468
UE-468
THERMALL
500
TYPE 500
503A
504A
504R
X504
Y-504
508
HV511
X521A
527/PL-185
3-500G4
AT-530
WL-530
VT-133
545
552
572B
Y-579
X-591
592
3-200A3
TR593A
Y-602
HY615
Y-621B
HK-654
Y-654
Y-667A
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