HP Aikido Stereo 9-Pin B manual ECC81

12					GlassWare Audio Design
									Input	Input	Output	Output	Zo Line	Zo HP
Tube	B+	Ik(mA)	mu	rp	Rk	R15	R16	R17	Gain	Gain dBs	Gain	in dBs	Amp.	Amp
6AQ8	300V	10.0	57.0	9700	100	93.2k	100k	170	28.1	29.0	0.97	-0.24	248	85
6BK7	300V	10.0	43.0	4600	200	91.1k	100k	107	21.2	26.5	0.97	-0.27	279	53
6BQ7	300V	10.0	38.0	5900	191	90.0k	100k	155	18.7	25.5	0.96	-0.32	311	78
6BS8	300V	10.0	36.0	5000	220	89.5k	100k	139	17.8	25.0	0.96	-0.33	321	69
6CG7	150V	3.0	20.5	10200	583	82.2k	100k	498	10.0	20.0	0.93	-0.59	827	249
6CG7	200V	5.0	21.1	8960	397	82.7k	100k	425	10.4	20.3	0.93	-0.59	657	212
6CG7	250V	5.0	21.0	9250	626	82.6k	100k	440	10.3	20.2	0.94	-0.56	820	220
6CG7	300V	4.5	20.8	9840	1000	82.5k	100k	473	10.1	20.1	0.94	-0.53	1063	237
6CG7	300V	7.3	21.4	8370	470	82.9k	100k	391	10.5	20.4	0.94	-0.56	686	196
6CG7	300V	10.0	21.9	7530	243	83.3k	100k	344	10.8	20.7	0.93	-0.60	489	172
6CG7	350V	10.0	21.8	7680	352	83.2k	100k	352	10.7	20.6	0.94	-0.57	576	176
6DJ8	100V	5.0	30.2	3670	182	87.6k	100k	122	15.0	23.5	0.96	-0.39	273	61
6DJ8	150V	10.0	30.7	2870	124	87.8k	100k	93	15.2	23.7	0.96	-0.39	199	47
6DJ8	200V	10.0	30.0	2960	205	87.5k	100k	99	14.9	23.4	0.96	-0.37	274	49
6DJ8	250V	10.0	29.6	3060	291	87.3k	100k	103	14.6	23.3	0.96	-0.36	350	52
6DJ8	250V	5.0	28.6	3980	673	86.9k	100k	139	14.0	22.9	0.96	-0.35	667	70
6DJ8	300V	5.0	28.3	4080	845	86.8k	100k	144	13.8	22.8	0.96	-0.34	787	72
6DJ8	300V	8.0	28.9	3400	481	87.1k	100k	118	14.2	23.0	0.96	-0.35	511	59
6FQ7	See 6CG7 and 6SN7
6GM8	24V	2.0	14.0	3400	187	75.0k	100k	243	7.0	16.8	0.90	-0.90	357	121
6H30	100V	20.0	15.4	1140	69	77.0k	100k	74	7.7	17.7	0.91	-0.80	127	37
6H30	150V	30.0	15.9	1040	74	77.7k	100k	65	7.9	18.0	0.92	-0.75	124	33
6H30	200V	20.0	15.4	1310	221	77.0k	100k	85	7.7	17.7	0.92	-0.68	267	43
6H30	250V	20.0	15.4	1380	294	77.0k	100k	90	7.7	17.7	0.93	-0.66	330	45
6H30	300V	15.0	15.0	1670	530	76.5k	100k	111	7.4	17.4	0.93	-0.65	528	56
6N1P	200V	3.0	39.8	12200	328	90.4k	100k	307	19.4	25.8	0.96	-0.32	539	153
6N1P	250V	5.0	36.0	9480	221	89.5k	100k	263	17.7	25.0	0.96	-0.36	422	132
6N1P	300V	5.0	35.0	956	642	89.2k	100k	27	17.1	24.7	0.97	-0.25	569	14
6N27P	24V	2.0	14.0	3400	187	75.0k	100k	243	7.0	16.8	0.90	-0.90	357	121
9AQ8	See 6AQ8
12AT7	200V	3.7	60.0	15000	270	93.5k	100k	250	29.1	29.3	0.98	-0.21	457	125
12AU7	100V	2.5	17.0	9560	427	78.9k	100k	562	8.4	18.4	0.92	-0.75	757	281
12AU7	150V	3.0	16.6	9570	741	78.5k	100k	577	8.1	18.2	0.92	-0.71	959	288
12AU7	200V	4.0	16.7	9130	768	78.6k	100k	547	8.2	18.2	0.92	-0.69	959	273
12AU7	250V	8.0	17.9	7440	336	79.9k	100k	416	8.8	18.9	0.92	-0.71	601	208
12AU7	300V	10.0	18.1	7120	328	80.1k	100k	393	8.9	19.0	0.92	-0.70	581	197
12AV7	200V	9.0	37.0	6100	120	89.7k	100k	165	18.3	25.3	0.96	-0.36	258	82
12AV7	300V	18.0	41.0	4800	56	90.7k		117	20.4	26.2	0.96	-0.35	160	59
12AZ7	See 12AT7
12AX7	200V	0.5	100.0	80000	2000	96.1k	100k	800	39.0	31.8	0.99	-0.11	1719	400
12AX7	300V	1.0	100.0	62500	1100	96.1k	100k	625	42.6	32.6	0.99	-0.12	1238	313
12BH7	100V	4.0	16.1	5480	340	77.9k	100k	340	8.0	18.0	0.92	-0.76	549	170
12BH7	150V	4.0	15.7	6090	706	77.4k	100k	388	7.7	17.7	0.92	-0.71	826	194
12BH7	200V	5.0	15.9	6140	787	77.7k	100k	386	7.8	17.8	0.92	-0.68	877	193
12BH7	250V	10.0	17.4	4870	383	79.4k	100k	280	8.6	18.7	0.93	-0.67	541	140
12BH7	300V	15.0	18.4	4300	267	80.4k	100k	234	9.1	19.2	0.93	-0.65	422	117
12BZ7	300V		100.0	31800		96.1k	100k	318	48.5	33.7	0.98	-0.17	292	159
12DJ8	See 6DJ8
12FQ7	See 6SN7
5687	150V	24.0	18.1	1760	37	80.1k	100k	97	9.0	19.1	0.91	-0.78	119	49
5687	200V	20.0	17.5	1970	132	79.5k	100k	113	8.7	18.8	0.92	-0.68	216	56
5687	250V	20.0	17.4	2060	198	79.4k	100k	118	8.7	18.7	0.93	-0.65	276	59
5687	300V	15.0	16.9	2440	397	78.8k	100k	144	8.4	18.5	0.93	-0.62	455	72
5751	200V	0.8	70.0	58000	1250	94.4k	100k	829	30.5	29.7	0.98	-0.17	1407	414
5963	250V	10.0	21.0	6600	200	82.6k	100k	314	10.4	20.3	0.93	-0.63	433	157
5965	300V	8.2	47.0	7250	220	91.8k	100k	154	23.1	27.3	0.97	-0.26	337	77
6072	300V	2.0	44.0	25000	1250	91.3k	100k	568	20.3	26.2	0.97	-0.25	1272	284
7119	300V	15.0	21.7	2390	324	83.1k	100k	110	10.7	20.6	0.95	-0.48	377	55
ECC81	See 12AT7
ECC82	See 12AU7
ECC83	See 12AX7
ECC85	See 6AQ8
ECC86	See 6GM8

The table above lists many triodes suitable for the 9-pin-based Aikido amplifier PCB. The table lists the same tube under different B+ voltages and with different cathode resistor values. Two gains are listed: the first is the gain the tube realizes in the input position in the Aikido; the second is the gain of the same tube in the output stage. To calculate the final gain multiply the two voltage gains together (or add the gain in dBs together). For example, given an Aikido line amplifier with a B+ voltage of 300V, and a 6CG7 input tube with cathode resistors of 1k, and a 6DJ8 output tube with cathode resistors of 481 ohms, the final voltage gain equals 10.1 from the 6CG7 against the 0.96 gain of the 6DJ8, with a product of 9.7. or, working with dB instead, 20.1dB plus -.35dB, for a total of 19.75dB. (Aren’t decibels great?)