Glassware audio design 12 – HP Aikido Stereo 9-Pin PCB User Manual
Page 13
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+ 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?)
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