GlassWare Audio Design | 5 |
B+
DC | 300k | AC |
Heater | ||
PS | 2W |
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|
B+
4
B+
300k
2W
B+
4
0.1µF |
| 100k | 0.1µF |
| 100k |
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| ||||
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250V |
| 1/2W | 250V |
| 1/2W |
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|
|
100
100
Alternatively, you might experiment with floating the heater power supply, by “grounding” the heater power supply via only a 0.1µF film or ceramic capacitor. The capacitor will charge up through the leakage current between heater and cathodes. Not only is this method cheap, it is often quite effective in reducing hum.
B+
4
Power Supply
The power supply is external to the Aikido PCB and can be mounted in, or outside, the chassis that houses the PCB. The optimal power supply voltage depends on the tubes used. For example, 6GM8s (ECC86) can be used with a low 24V power supply, while 6FQ7s work better with a
The genius of the Aikido circuit is found in both its low distortion and great PSRR figure. Nonetheless, a good power supply helps (there is a practical limit to how large a
.01µF | .01µF |
1KV | 1KV |
100mA
.01µF | .01µF |
1KV | 1KV |
All Diodes = 1N4007
All Resistors = 1 ohm 1/2W