GlassWare Audio Design | 7 |
Configuring the PCB as a Line Amplifier
The Aikido topology makes a perfect line amplifier, as it offers low distortion, low output impedance, and excellent
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| B+ |
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| R6 |
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| C5 | C6 |
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| R9 |
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| R7 | C1 |
| out |
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| R4 | R8 |
| J8 (J9) |
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| out | R15 |
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| C2 |
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in | R3 |
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| R10 |
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R1 | C11 |
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| C12 | R12 | R13 | R14 | R16 | |||||||||||
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| R2 | R5 |
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| R11 C3 | |||||||
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| (input) V2, V3 | (output) V1, V4 |
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Typical Part Values () Parentheses denote recommended values |
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| 6CG7 & 6DJ8 |
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| 6CG7 & 6CG7 | 12AU7 & 12AU7 | 12AU7 & 12BH7 | ||||||
| B+ Voltage = | 170V - 250V (200V) |
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| 200V - 300V (300V) | 200V - 300V (250V) | 200V - 300V (300V) | ||||||||||||
| Heater Voltage = | 6.3V |
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| 6.3V | 12.6V |
| 12.6V |
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R1,5,6,7,12,13,14 | = |
| 1M |
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| 1M | 1M |
| 1M |
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| R2,4 | = |
| 270 - 1k (470)* |
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| 470 - 2k (870)* | 470 - 2k (680)* | 470 - 2k (1k)* |
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| R3,9,10 | = |
| 100 - 1k (300)* |
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| Same | Same |
| Same |
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| R8,11 | = |
| 200 - 330 (200 10mA)* | 270 - 680 (270)* | 180 - 470 (200)* | 200 - 470 (523)* | |||||||||||
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| R15 | = |
| 87.5k |
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| 83.2k | 80k |
| 79.3k |
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| R16 | = |
| 100k |
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| Same | Same |
| Same |
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| All resistors 1/2W or higher |
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| C1 | = |
| 0.1 - 4µF* Film |
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| Same | Same |
| Same |
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| C2 | = |
| 0.1 - 4µF* Oil | " |
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| C3 | = |
| none | " |
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| C5 | = |
| 1 - 10µF* Film or Oil | " |
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| C6 | = |
| 0.1 - 1µF* Film or Oil | " |
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| C7,8,9,10 | = |
| 47µF - 1kµF, 16V | " |
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| " |
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| C11,12 | = |
| 0.1µF 160V(optional) |
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| Same | None |
| None |
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| *Voltage rating must equal or exceed B+ voltage |
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| (input) V2, V3 = | 6CG7, 6FQ7 |
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| 6CG7, 6FQ7 | 12AU7, 5814, 5963, | 12AU7, 5814, 5963, | ||||||||||||
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| 6189, ECC82 | 6189, ECC82 |
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| (output) V1, V4= | 6DJ8, 6922, |
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| 6CG7, 6FQ7 | 12AU7, 5814, ECC82 | 12BH7, ECC99 |
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| 7308, E88CC |
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