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GlassWare Audio Design
12
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+ voltag
e 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?)
Tube B+ Ik(mA) mu rp Rk R15 R16 R17
Input
Gain
Input
Gain dBs
Output
Gain
Output
in dBs
Zo Line
Amp.
Zo HP
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
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
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
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
12FQ7
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
ECC82
ECC83
ECC85
ECC86
See 6CG7 and 6SN7
See 12AU7
See 12AX7
See 6AQ8
See 6GM8
See 12AT7
See 6DJ8
See 6SN7
See 12AT7
See 6AQ8