管球式プリアンプ製作 - ayumi.cava.jp

1 Ayumi's Lab. 12 5 . 2002. Updated 2003 12 16 .. 1 1. 2 2. 3 4. 4 8. 5 9. 6 10.. 10.. 12. 1 . 2001 12 Professor 4 .. LP .. S /N NF CR . Rec. out . 10 k . Line out 47 k .. 1. 2 . 3 NF . 6267- 12AU7 [2, p. 28] 12AX7-1/2 12AU7 [2, p. 39] 2 MJ 2002 6 . 12AX7-1/2 12AU7 [4] 6267 . 12AX7 12AX7 .. V1, V2 12AX7 V3 12AU7. V. V ( V). ( V) [ V] R6 180 k . [ V]. 6 1 (6)1. 7 2 (7)2. Phono C1. V V. F. 8 3 ( V) ( V) (8)3. 250 V to Input selector R1 [ V] [ V]. 47 k C3 F. R3 R4 C2. R2 R5 R7 250 V R10. 220 k 470 k 220 F. 2 k 2 k 47 k 470 k . 16 V. V. ( V) R22. [ V] 10 k 2 W. B+. (258 V). C13. V R9 M R8 100 k . 47 F. ( V). 350 V. [ V]. C5 2530 pF C4 750 pF. 500 V 500 V. 1: . 1 L ch. R ch. SPICE. C5 2200 pF 330 pF . R9 M . C1 . Marantz 7 F . 36 dB (63 ) V1a R2 NFB . R6 180 k .. E p0 = 113 V, E g0 = V, I p0 = mA = 97, r p = 81 k , gm = 1200 S A1 . 150. A1 = 97 34 (1). 81 + (1 + 97) 2 + 150. 2 . E p0 = 113 V, Eg0 = V, I p0 = mA = 97, r p = 78 k , 2.

2 = 1240 S 1 kHz ( ) 73 41 j k . gm A2 . 73 41 j A2 = 97 j (2). 78 + 73 41 j 3 2 .. A . A = A1 A2 = 34 ( j) 1710 432 j (3). 2. Eg=0V 1. 1. AC load line (150k). Ip (mA) 2. 3. DC load line (220k). 0. 0 50 100 150 200 250 300. Ep (V). 2: . 1 kHz . 2. = = + j (4). 2 + 101 j A f . A Af = = | j| = 1 + A (5).. Eg=0V 1. AC load line ( ). 1. 2. Ip (mA). 3. DC load line (163k). 0. 0 50 100 150 200 250 300. Ep (V). 3: 2 . E p0 = V, Eg0 = V, I p0 = mA . = , r p = k , gm = 1340 S 47 k . 3. k A . A = = (6). (1 + ) + . Zo =. //47//470 = [k ] (7). + 1. 4 . 10. Eg=0V. 2. 4. 8. 6. 8. 6. Ip (mA). AC load line ( ) 10. 12. 4. 14. 16. 2. 18. 20. DC load line (47k). 0. 0 50 100 150 200 250 300. Ep (V). 4: . 5 6 RIAA . RL = 47 k ( dB) RL = 10 k ( dB) 36 dB . C3 F 10 k . 20 Hz dB . 7 RIAA .. C1 . 3 . [4] CR CR . 20 dB 20 dB 40 dB .. CR 12AU7 SRPP . ( k ) .. NF . Bax VR [1] . VR 3 ( ) . LUX CR . 4. 60. RL=47k 50. RL=10k 40. Gain (dB).

3 30. 20. 10. 0. 10 100 1k 10k 100k Frequency (Hz). 5: ( ). 3. RIAA difference (dB). 2. RL=47k 1. 0. 3 2 1. RL=10k 10 100 1k 10k 100k Frequency (Hz). 6: RIAA ( ). 2. RL=47k With Decoupling RIAA difference (dB). 0. 2. RL=10k With Decoupling 4. 6. 1 10 100 1k Frequency (Hz). 7: RIAA ( ). 5. [3] 12AX7 . Web LUX SQ38FD . ( ) .. NF gm 1 k . 12at7 .. SRPP 12AU7 + . 2 + .. 6 . Rec. 1 Rec. 2. C7 5600 pF 50 V. V4, V5 12AU7 V6 12at7 . V Bass 5 11. ( V) R14 100 k VR3 500 k B R15 100 k . Source [ V] R12 100 k 3 1. 4 10 2. Off S3. 6 12. 2 8 6 1 Tone Defeat (6)1 [ V]. 1 2. S2 Rec. Out Line Out 2 1 1 7 7 2. C8. (7)2. 470 pF C10 F. V. V 50 V R16 20 k V 400 V. 8 ( V) 3 (8)3. 7 16 ( ) ( V). to Eq. [ V] R18 R19. [ V] C6 F [ V]. 2 C9 47 k 470 k . 5 14 R11 R13 3 1 R17. 250 V. Line 2 220 F. k 100 k VR4 500 k B 820 . 4 9 18 13 16 V. Line 1 Treble 2 11. Play 2 S1 Input 1 10. Play 1 3 V V. VR1. 2 ( V) R21 ( V) R20. 100 k A. [ V] k 2 W [ V] k 2 W.

4 Volume (3)1 B+. VR2 to Eq. 1 2 (327 V). 250 k MN C12 C11. Balance 47 F 47 F. (1)3. 350 V 350 V. 8: . E p0 = V, E g0. = V, I p0 = mA . = , r p = k , gm = 880 S 100 k A . 100. A = = (8). + (1 + ) + 100. 9 . E p0 = V, E g0. = V, I p0 = mA . = , r p = k , gm = 860 S 100 k A . 100. A = = (9). (1 + )100 + . //100 = [k ] (10) Zo =. + 1. 10 11 .. 6. 5. Eg=0V 2 4. 6. 4. 8. 10. 3 12. Ip (mA). 14. 2. 16. 18. 1. DC load line (100k). 20. 0. 0 50 100 150 200 250 300. Ep (V). 9: . 5. Eg=0V 2 4. 6. 4. 8. 10. 3. 12. Ip (mA). 14. 2. 16. 18. 1. DC load line (100k). 20. 0. 0 50 100 150 200 250 300. Ep (V). 10: . 20. V4a Plate V4b Cathode 15. Gain (dB). 10. 5. 0. 1 10 100 1k 10k 100k 1M. Frequency (Hz). 11: ( ). 7. E p0 = V, E g0. = V, I p0 = mA . = , r p = k , gm = 2890 S ( 47 k ). k A . A = 30 (11). + 12 8. Eg=0V 1. AC load line ( ). 2. 6. 3. Ip (mA). 4. 4. 5. DC load line (47k). 2. 6. 7. 0. 0 50 100 150 200 250 300. Ep (V).

5 12: . 13 . ( dB) . 15. 10. Response (dB). 5. 0. 5. 10. 15. 10 100 1k 10k 100k Frequency (Hz). 13: ( ). 4 . B 6X4 .. 8. L1 30H 30mA. TANGO ST-30 V7 6X4. V V. B+. V. 3 4, 7 R204. C205 C206 330 k . A Power 47 F 47 F 1W. 260 V V. 450 V 350 V. 100V. 6. 1 R205 C207. 0V. 82 k 47 F. AC. 1W 100 V. 100 V. 260 V. 0V U1 LM350T. D1 RBV402L + V + V . + IN OUT. ADJ 4 . C201 C202. R201 D2. 15 V 10000 F F R203. 200 1N4002. 25 V 25 V 47 k R206. C204. k . F. 25 V D3. R202 LED. C203. k . 22 F E1L33-3B. 25 V . 5 . Q1 2SA1015. 14: . LM350T (LM317T ) .. 60 V 12AU7. 200 V .. 15 . Duncan's Amp Pages ( ) 12AX7 V . 1 A .. 14. 12. 10. Constant Voltage 8. Vh (V). Ih (A). 6. 4. 2. Slow Start 0. 0 2 4 6 8 10 12 0 2 4 6 8 10 12. Time (sec.) Time (sec.). 15: ( ). 5 . FU88-320 80 mm .. ( san-ei/).. 9.. PC Optima Linotype . ( ) . 1 $21 1 ( . Optima ) . ( ) ( aidcraft/) . 2 200 mm 150 mm B 3,300 Web D3 ( ) .. DALE 1/2 W Philips . 1/2 W 1 W.

6 Muse . V3 V7 Philips EGC .. 6 . 5% . V B .. 16 L ch. R ch. 10 k . (Zin = 100 k ) . 1 kHz V ( mV) . 50 Hz . 1 kHz 10 k ( dB) . 100 k ( dB) . RIAA ( 17) 100 k 20 Hz 20 kHz dB . 18 . 5 V .. 70 dB . 19 10 k . 100 k 1/10 100 k .. 20 700 . 800 .. 10. 60. 50. 40. Gain (dB). 30. 20. 10. 0. 10 100 1k 10k 100k Frequency (Hz). 16: . 3. RIAA difference (dB). 2. 1. 0. 3 2 1. 10 100 1k 10k 100k RIAA difference (Hz). 17: RIAA . 60. 70. Crosstalk (dB). 80. 90. 100. 10 100 1k 10k 100k Frequency (Hz). 18: . 11. 50. 10. Vo (V), Distortion (%). 1. 1kHz 10kHz 100Hz 1kHz, ZL=100kohm 1 2. Vi (V). 19: . 5k Zo (ohm). 1k 500. 10 100 1k 10k 100k 1M. Frequency (Hz). 20: .. 21 Tone defeat 1 V . Hz 140 kHz .. 10. Response (dB). 5. 0. 5. 10. 5 10 100 1k 10k 100k 200k Frequency (Hz). 21: (Tone defeat). 12. 22 . 5 V .. 20. 40. Crosstalk (dB). R to L. 60. L to R. 80. 100. 10 100 1k 10k 100k Frequency (Hz). 22: . 23 1 kHz 10 k ( dB) . 100 k ( dB) R ch.

7 L ch. dB . 20. 10. Vo (V), Distortion (%). 1kHz 1. 1kHz, ZL=100kohm 1 5. Vi (V). 23: . 24 Lux NFB. 13. 870 . 5k Zo (ohm). 1k 500. 10 100 1k 10k 100k 1M. Frequency (Hz). 24: . 25 13 dB .. 15. 10. Response (dB). 5. 0. 5. 10. 15. 10 100 1k 10k 100k Frequency (Hz). 25: .. L ch. R ch. ( ) mV mV. (A ) mV mV. ( ) mV mV. (A ) mV mV. 200 mV, 1V S/N . 75 dB, 94 dB .. [1] , , .. , 2000. [2] .. , 2000. [3] .. , , 1999. [4] . MJ . , June 2002. 14.