RE:改めてためしました
投稿者：
北九州市/港
投稿日：
2019年11月04日 08:47:40
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内尾様
おはようございます。
ご無沙汰しております。
使用中のPCが故障しデーター復活に手を取られていました。
まだ半分の復活です。
SX-25の正規のデーター資料が有りましたので参考までに。
各部の電圧配分表も有りますが、取敢えずこれで。
SX-25 VOLTAGE & RESISTANCE MEASUREMENTS
Voltage measurements made with RCA VOLTOHMYST WV-98C VTVM - Resistance measurements made with Fluke 8024B DVM
A 20,000 ohm/volt VOM yields values up to 5% higher than VTVM measurements - ALL FIGURES ARE REPRESENTATIVE AND
NOT TO BE CONSTRUED AS ENGINEERING SPECIFICATIONS.
CONDITIONS: SX-25 with 4 coils each in antenna, 1st RF, 2nd RF and oscillator chain; RF and AF gain at maximum;
Selectivity at SHARP IF/AVC ON; BAND #2 tuning capacitor at MINIMUM capacity (fully unmeshed); BFO OFF (except for 6J5
measurements); ANL OFF (except for 6H6 Measurements; Line voltage maintained at 115 VAC’ All voltage and resistance
measurements between pin and chassis ground; Resistance measurements made with SX-25 depowered and RF/AF gain
controls fully clockwise. TUBE PINS READ COUNTER-CLOCKWISE FROM KEY ON TOP OF CHASSIS OR CLOCKWISE
FROM KEY WHEN READ BELOW CHASSIS. NA = Not applicable (no connection).
VOLTAGE (All values DC volts unless marked otherwise)
SOCKET PIN 1 2 3 4 5 6 7 8 CAP
1st RF 6SK7 0 0 3.5 - 0.4 3.5 85 5.8 RMS
AC 291 NA
2nd RF 6SK7 0 0 4.0 - 0.3 4.0 83 5.8 RMS
AC 282 NA
CONVERTER 6K8 0 0 255 143 - 15.0 252 5.8 RMS
AC 3.9 0.2
1st IF 6SK7 0 0 5.1 - 0.4 5.0 84 5.8 RMS
AC 328 NA
2nd IF 6SK7 0 0 3.5 0 3.2 82 5.8 RMS
AC 280 NA
2nd Detector 6SQ7* 0 0 1.0 0.2 0.2 130 5.8 RMS
AC 0 NA
Phase Inv 6SQ7 0 0.5 0.95 0 0 118 5.8 RMS
AC 0 NA
Amp (Front) 6F6 0 0 305 301 0.2 0 5.8 RMS
AC 18 NA
Amp (Rear) 6F6 0 0 320 320 0.3 0.4 5.8 RMS
AC 15 NA
ANL 6H6 (ON) 0 0 - 1.0 0.4 - 0.3 0 5.8 RMS
AC 0 NA
Rectifier 80** 5.3 RMS
AC FIL 285 RMS AC 285 RMS AC 9.0 RMS
AC NA NA NA NA NA
BFO 6J5 (ON) 0 0 112 - 0.2 - 65.0 0 5.8 RMS
AC 0 NA
Notes: * 2nd detector 6SQ7 (pins 4 & 5) are AVC signal and fluctuate with signals. ** Orientation of rectifier
socket varies with production run; caution to double-check pin-out of filaments and plate of your actual tube
pins; heater voltage vary when measured against chassis ground but all result in a 5.0 VAC voltage drop
across filament.
SOCKET PIN 1 2 3 4 5 6 7 8 CAP
1st RF 6SK7 0 0 580 202.5K 600 14.5K 0 35K NA
2nd RF 6SK7 0 0 540 6 540 14.5K 0 54K NA
CONVERTER 6K8 0 0 36K 85K 64K 58K 0 250 120K
1st IF 6SK7 0 0 1000 240K 1100 15K 0 44K NA
2nd IF 6SK7 0 0 520 5.7 500 14.5K 0 35K NA
2nd Detector 6SQ7 0 201K 135 Infinity Infinity 390K 0 Infinity NA
Phase Inv 6SQ7 0 10 135 505K 505k 304K 0 Infinity NA
Amp (Front) 6F6 0 0 33K 33K 41K Infinity 0 Infinity NA
Amp (Rear) 6F6 0 0 32K 32K 500K 205K 0 Infinity NA
ANL 6H6 (ON) 0 0 1.5MEG Infinity 45K Infinity 0 Infinity NA
Rectifier 80 60 56 32.5K 32.5K NA NA NA NA NA
BFO 6J5 (ON) 0 0 50 Infinity 48K Infinity 0 Infinity NA
RESISTANCE (All values in ohms)
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