CV 136:	EL91 or 6AM5
CV 140: 6AL5 or EAA91
CV 287: STV 70/20
CV 317: ????
CV 406: E1423
CV 416: 6F17
CV 717: 5R4GY
CV 850: 6AK5 or EF95 or 403
CV4003: 12AU7WA