McIntosh MC 225 Service Manual
This is the 4 pages manual for McIntosh MC 225 Service Manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from McIntosh MC 225 Service Manual (Ocr-read)
Page 1
Page 2
Table 1. MC225 VOLTAGE AND RESISTANCE CHART (Schematic No. SC126-167A) Tube 12AX7 (VI) 12AU7 (V2 or V3) 12BH7 (V4 or V5) 7591 (V6, V7, V8, or V9) Pin No. 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 DC Volts 115 0 1 FIL FIL 115 0 1 FIL 295 115 121 FIL FIL 295 100 121 FIL 285 25 39 FIL FIL 285 25 39 FIL FIL 390 390 0.8 -21 FIL 390 Resistance in Ohms, Unit Off 180K 1M 3.3K 0 0 180K 1M 3.3K 0 27K* 180K 18K 0 0 30K* 2.4M 18K 0 22K* 220K 4.7K 0 0 22K* 220K 4.7K 0 0 62* 130* 40 180K 0 130* This Resistance measured to positive side of B+ rectifier SR2. Warning: Discharge filter condensers before making measurements. A high resistance VTVM is used for all measurements, voltages and resis- tances are to ground except as noted.