sunn_sceptre_1971 电路图 维修原理图.pdf

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1、收音机爱好者资料库 Ra d i o Fa n s .CN MOD Bias 2 BD NEUTRAL LINE 3 AMP SLO BLO POWER SWITCH with indicator 6.3 VAC to all heaters 5 VAC 6.8K / 2W6.8K / 2W A 498 VDC B 386 VDC C 290 VDC 430 VAC 430 VAC 6 8 2 4 Bias 1 -60 VDC + 1 2 3 4 V5 A 5 3 8 8 5 4 3 V4 8 ohm 4 ohm CBC V3BV3A MID BOOST (A) TREBLE BASS CON

2、TOUR inout V1A MID BOOST (B) VOLUME D V1B 6 7 8 BRIGHT NORMAL 270K/.001uF D 254 VDC 10K / 2W 30+20uF20uF20uF 20uF 600V + E +22 VDC C101 50uF C102 1000uF D102 22V 1W Located on R/T PCB R101 1K / 2W R102 1K / 2W 50uF50uF18K BIAS 10K 1K 504 VDC GZ34 V6 270K/.001uF 47K 47K 150K1.5K250uF 100K100K 500K 0.

3、01470pF 1.5K .22 56K 270pF .022 .022 250K 1M 25K 220K 100K100K 47 680 1.5 12pF 20M 0.1 270K1.5M12pF 47K 1W 47K 1W 390pF 0.1 0.1 100K 100K 1K 1K 1K / 2W 680 / 2W 750pF 1 2 3 6 7 8 9 1971 SUNN SCEPTRE with MID BOOST drawn by Steve Luckey, 07/01/2006 4 (brn) 16 (yel) 12AX7 6AN8 6550 6550 8 (orn) 0 (blk

4、) blue/wht grn/wht grn blue red Bias 2 -60 VDC + 50uF18K BIAS 10K Bias 11 1 Fluke 87V True RMS DMM These voltages measured after 1 hour warm-up with line voltage at 120VAC. Bias pots were adjusted for 60mv at bias test jacks on cathodes of V4 and V5. 495 495 498 498 60mv 60mv Power Transformer Woodw

5、ard-Schumacher 28-2360 606103 (1971, week 3) Output Transformer Woodward-Schumacher 28-1360 606108 (1971, week 8) 20uF 600V STBY 176 0 1.2 1.2 0 176 0.8 317 520 52 68 21 386386290290253253 498 -64 -62 DEPTH Tremolo circuit 500pF 1MA XY Reverb circuit Dual bias mod ON ON D101 1N4007 收音机爱好者资料库 Ra d i

6、o Fa n s .CN 220K Gibbs Reverb Spring Assembly R118 15 .0047 REVERB REVERB FOOTSWITCH 16 7 2 83 V2-BV2-A Reverb Input from V1 pin 1 100K Reverb Input Reverb Output .005 4.7K .05 47K1.5K1uF2.2K .022470K DCE R116 220K C109 .022 R117 2.2M 10K 4.7K + R119 470K C110 750pF Reverb Output to V3 pin 8 R114 1

7、.5K Tremolo Output to points “X” and “Y” 15 R107 220K C103 2uF E TREMOLO FOOTSWITCH TREMOLO SPEED R105 1.8K 25K C106 1uF C105 2uF C104 1uF 25K25K R104 1.8K R103 2.7K R108 10K R110 15 R106 680KQ101 2N2923 Q102 2N2923 R109 4.7KC107 10uF R111 3.3K 22K R113 22K R112 22K Q103 2N2102 BC141C Q104 2N2923 R1

8、15 10K 10uF 12AU7 + + + + LED + 253290 87 0 3.7 288 0 11.6 Vactrol VTL5C1 * * * * Original SIGMA DATACEL 301 R2-12 replaced with Vactrol VTL5C1 * Original 1.2K replaced with 10K to work with Vactrol. * Original 25K Depth control replaced with 22K 22V 22V 4AB3C1B works well TM101 C108 10uF Components

9、 with series 100 part designations are located on the R/T PCB 收音机爱好者资料库 Ra d i o Fa n s .CN C102D102R101R114 R113 TM101R102 R110 Q103 R118 R116 R115 R112 C110 Q104 R119 R117 C109 R105C107R111C103R104C104C108 C105 C106 D101 R106 R107 Q101 R108 R109 Q102 C101 R103 Bias1 -60 VDC + 50uF50uF18K BIAS 1 10K 1K Bias 2 -60 VDC + 50uF18K BIAS 2 10K Dual bias mod Bias Tap 4 5 6 7 8 1 2 3 4 5 6 7 8 1 2 3 11 + + Sprague Atom 50F 150V + + Sprague Atom 50F 150V BLACK CAT 0.1uF 600V E1 E2 BLACK CAT 0.1uF 600V BIAS 1BIAS 2 1 2 3 4 5 6 7 8 9 Bias Tap + + Sprague Atom 50F 150V