RTC
140,000
IEC
400,000 
2,000
PSVANE
75,000 380
GE
80,000 500
RCA
0 800
Ken-Rad
0
SIEMENS
0 2,000
TUNGSOL
100,000 2,700
웨스턴 일렉트릭
0
General Electric
450,000 1,800
CEI
0
SYLVANIA
320,000 2,400
SIEMENS
0
General Electric
140,000 2,700
MULLARD
0 4,800
TELEFUNKEN
0 350
SYLVANIA
350,000 4,000
