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Pentode/Triodes
My impression from paging through the tube manual is that there are a lot of pentode/triodes and that impression is right.
The 12FR8 is listed here because it is the only one of its kind.
		Heater (H), Filament (F)
Type	Function or configuration	H/F	V	A	Other Heater Voltages	Section Data	Max Plate Dissipation (watts)	Max Plate Voltage (volts)	Max Screen Voltage (volts)	Gm	µ	Rp	Common Cathode	Base Type	Notes.
6AN8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	2.6	300	-	3300	19	5750	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	2.0	300	150	6200	-	300 k
6AT8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	1.5	250	-	5800	40	6900	Yes	9 pin mini	Suppressor brought out to pin 8.
						Pentode	2.0	250	125	4600	-	750 k
6AU8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.6	8	Triode	2.5	300	-	5600	40	7200	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	3.0	300	150	8000	-	140 k
6AW8	High mu Triode Sharp Cutoff Pentode	H	6.3	0.6	8	Triode	1.0	300	-	4000	70	17.5 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	3.25	300	150	9000	-	400 k
6AX8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	-	Triode	2.7	300	-	8500	40	5 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	2.8	300	150	4800	-	400 k
6BA8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.6	-	Triode	2.0	300	-	2700	18	6700	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	3.25	300	150	9000	-	400 k
6BE8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	2.5	300	-	8500	40	5 k	No	9 pin mini	Suppressor tied to triode cathode.
						Pentode	2.8	300	150	5200	-	400 k
6BH8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.6	8	Triode	2.5	300	-	3300	17	5150	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	3.0	300	150	7000	-	150 k
6BL8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	-	Triode	1.5	100	-	3000	20	6.7 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	1.7	170	170	6200	-	400 k
6BM8 / ECL82	High mu Triode Power Pentode	H	6.3	0.78	-	Triode	1.0	300	-	2500	70	28 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	7.0	600	200	6400	9.5	200 k
6BR8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	2.5	330	-	7500	40	5300	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	3.0	330	165	5000	-	200 k
6CG8	Medium mu VHF Triode Sharp Cutoff Pentode	H	6.3	0.45	5	Triode	1.7	275	-	5800	40	6900	Yes	9 pin mini	Suppressor tied to cathode.
						Pentode	2.3	275	125	4600	-	750 k
6CU8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	-	Triode	2.8	330	-	5800	24	4100	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	2.3	330	165	7800	-	170 k
6CX8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.75	8	Triode	2.0	330	-	4600	40	8700	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	5.0	330	165	10,000	-	70 k
6DX8 / ECL84	High-Mu Triode / Sharp-CutOff Pentode					Triode
						Pentode
6EA8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5, 19	Triode	2.5	330	-	8500	40	5000	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	3.1	330	165	6400	-	200 k
6EB8	High mu Triode Sharp Cutoff Pentode	H	6.3	0.75	8	Triode	1.0	330	-	2700	100	37 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	5.0	330	165	12,500	-	75 k
6FG7	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	2.5	330	-	7500	43	5700	Yes	9 pin mini	Suppressor tied to cathode.
						Pentode	3.0	330	165	6000	-	180 k
6GH8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	2.5	330	-	8500	46	5400	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	2.5	350	175	7500	-	200 k
6GN8	High mu Triode Sharp Cutoff Pentode	H	6.3	0.75	8, 10	Triode	1.0	330	-	2700	100	37 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	5.0	330	165	11,500	-	60 k
6GW8 / ECL86	Medium-Mu Triode / Sharp-CutOff Pentode					Triode	0.5	300	-	1600	100	62.5 k	No	9 pin mini
						Pentode	9	550	300	10,000	-	48 k
6HF8	High mu Triode Sharp Cutoff Pentode	H	6.3	0.75	10	Triode	1.0	330	-	4000	70	17.5 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	5.0	330	165	12,500	-	75 k
6HZ8	High mu Triode Sharp Cutoff Pentode	H	6.3	1.125	-	Triode	1.0	300	-	4000	70	17.5 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	8.0	330	165	12,600	-	140 k
6JE8	High mu Triode Sharp Cutoff Pentode	H	6.3	0.78	8, 11	Triode	1.0	300	-	4200	70	17 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Triode	5.0	330	165	12000	-	140 k
6P7G	Low mu Triode + remote cutoff pentode	H	6.3V	0.3A	-	Triode	(=6F7)								Data for this type are unknown.
						Triode
6U8 / ECF82	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5, 9	Triode	2.7	330	-	8500	40	5 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	2.8	300	300	5200	-	400 k
6X8	Medium mu Triode Sharp cutoff Pentode	H	6.3	0.45	5	Triode	1.5	250	-	5800	40	6900	Yes	9 pin mini	Suppressor brought out to pin 1.
						Pentode	2.0	250	125	4600	-	750 k
12EC8	Medium mu Triode Sharp cutoff Pentode	H	12.6	0.225	-	Triode	N/A	16	-	4700	25	6 k	No	9 pin mini	Suppressor tied to pentode cathode.
						Pentode	N/A	16	16	2000	-	750 k
12FR8	Diode, Low mu Triode, and Sharp Cutoff Pentode	H	12.6	0.32	-	Triode	N/A	16	-	1200	10	8.3 k	No	9 pin mini	Diode plate current = 5 mA. Diode and Triode share a common cathode. Suppressor grid tied to Pentode cathode.
						Pentode	N/A	16	16	2700	-	400 k

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