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Summary of Contents for Analog Metric C22
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Page 1: User Manual
C22 Vacuum Tube Preamplifier Complete User Manual Analog Metric www.analogmetric.com sales@analogmetric.com Copyright ©2009 All Rights Reserved... - Page 2 [C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER MANUAL] Analog Metric www.analogmetric.com Page 2...
- Page 3 [C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER MANUAL] Analog Metric INTRODUCTION The circuit design is with referenced to the classical McIntosh C22 pre-amplifier. It uses three 12AX7 vacuum tubes for amplification and uses one pentode-triode vacuum tube 6F3P (6BM8) as voltage regulation. Vishay 1N5062 forming a bridge provides for full- wave rectification.
- Page 4 [C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER MANUAL] Analog Metric 2. Either connect delay output protection module (optional) to the jumper J6 and J7 or short it. 3. Connect the power transformer 280-300V AC, 12-15V AC, and 6.3V AC to the board, without plugging the vacuum tubes.
- Page 5 [C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER MANUAL] Analog Metric illustrated in Figure 2. Then, use a metal wire to short the connector L1 (displayed as yellow line) 3. Plug in the vacuum tube EL84 and 6J8 (EF86), and turn on the power supply.
- Page 6 4. Connect the B+: 290V DC and ground (J4) of tube voltage regulator board to positive and negative terminals of C15 of C22 preamplifier board respectively, as shown in Figure 3. Also, connect the secondary winding (15V AC) of T120 to the J3 of C22 preamplifier board for tube filament supply.
- Page 7 MANUAL] Analog Metric Figure 3: Connection of power supply by the tube voltage regulator to the C22 preamp. 5. To power up the input selector board and the delay protection board, the power supply ~12V DC can be obtained from the positive terminal of C13 or from the low voltage part of the tube voltage regulator, either J6 or J7 of tube voltage regulator board.
- Page 8 [C22 VACUUM TUBE PREAMPLIFIER COMPLETE USER MANUAL] Analog Metric Figure 5: Full C22 preamplifier connection diagram. 8. Plug in all the tubes (EL84 and 6J8 to power regulator board, and three 12AX7B to C22 preamplifier board) 9. Switch on the power supply without applying any input signals and check again the B+ voltage (~290V) and filament voltages (~12.6V).
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