November_02 电路图 维修原理图.pdf

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1、A 2.5 ohm SPEAKER .022uF 100K .022uF 100K 15K 5.6K 2 2 3 7 3 2 7 9 B 1 3 5.6K V3 12AX7 V4 EL84 V5 EL84 C 1K/2W C 7 8 6 470 47K 1M 1M 0.022uF .022uF 15K 9 B 1K/2W 1 1 F 5K LIN PRESENCE 0.1uF 39K NOTE 4 3.15 VAC 33uF 33uF 5K / 5W A 348 VDC B 346 VDC C 288 VDC 275 VAC 275 VAC 6 8 4 V6 V5V4V2V1 4455 449

2、9 55 5AR4 2 V3 4 9 5 NEUTRAL LINE 2 AMP SLO BLO 33uF 5 VAC 33uF 10K / 2W10K / 2W D 248 VDC E 233 VDC 33uF 25uF9.1K / 1W 200K / 1W 3.15 VAC +15 VDC 100K / 1W + 25uF BIAS ADJ 10K 6.8K 47K 25uF F -15VDC 1N4007 All filaments are operated at 6.3 VAC and floated to +15 VDC for hum rejection. 1M LOG MSTR V

3、OL Pwr Amp In E 2.7K 100K 0.68uF 1 2 3 820 100K V1-B 330 uF 6 7 8 VOL 2 (dark) 1M LOG VOL 1 (bright) 1M LOG .0022uF .022uF 470K 270pF 470K 470pF 47K 1M D 820 100K V2-A C10 0.68uF 1 2 3 6 7 8 D 100K 250K LIN TREBLE 470pF .022uF .022uF 33K 1M LOG BASS 25K LIN MID November Revision 11 from AX84.COM Red

4、rawn by Steve Luckey Completed on February 18, 2007 STUFFED VOX This amp is actually a November Project amp built on a split chassis design to fit a Vox cabinet. Components shown in the shaded areas are physically located on the Preamp Chassis. For a cleaner tone with less distortion, remove C10. Ne

5、gative Feedback scaling resistor value is determined by the Output Transformer tap used: 2.5 tap = 22K 4 tap = 29K 8 tap = 39K 16 tap = 56K NOTE 1 NOTE 2 NOTE 3 NOTE 4 EL84 max plate dissipation is 12 Watts. Set BIAS ADJ to provide 8.4 Watts (70% max). Measure mV across 1 ohm cathode resistors and d

6、irectly convert to mA. Measure Plate voltage. (Plate voltage) X (mA) = plate dissipation. 12AX7 V1-A 12AX7 V2-B E POWER STANDBY Preamp Chassis p/o Preamp Chassis NOTE 3 NOTE 2 收音机爱好者资料库 Ra d i o Fa n s .CN V2V1 T S G B+ Gnd 270p 470p 470p Board Dimensions:5 13/16 x 2 3/4 Designed by:Steve Luckey Dat

7、e:May 12, 2007 November Preamp Board Layout to Preamp connector on Power Amp .022F 630v .022F 630v 0.68F 100v + + 33F 450V + + 33F 450V .0022F 630v .022F 630v 0.68F 100v + + 330F 25V Bass 1M-A Master 1M-A Mids 25K-L Treble 250K=L Bright 1M-A Normal 1M-A 4 5 6 7 8 1 2 3 RG-174 STP (Shielded Twisted P

8、air) Heaters B+ STP (Shielded Twisted Pair) 收音机爱好者资料库 Ra d i o Fa n s .CN 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 AC Bias Input Ground #1 T S G PlatePlate B+ PREAMP CONNECTOR T S G 8 OHM4 OHM HTR CT Choke Board Dimensions:8 3/4 x 2 3/4 Designed by:Steve Luckey Date:May12, 2007 November Power Amp Board 1N400

9、7 + + 33F 450V + + 33F 450V + + 33F 450V 5K ohm 5 watt + + 47F 100V + + 47F 100V + + 47F 100V .022F 630v .022F 630v 1K ohm 5 watt 1K ohm 5 watt 0.1F 250v V5 EL84 Power AmpV6 5Y3 Rectifier .022F 630v V4 EL84 Power Amp V3 12AX7 Phase Inverter 0.1F 250vPresence 5K-L 10K Bias 2.75 Heater 收音机爱好者资料库 Ra d i o Fa n s .CN