LatestSchematic 电路图.pdf

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1、Note A: Fixed Bias: 22 27 mV across the 1-ohm resistor Grid VoltsSugg. mVoltage cathode 40023.8 mV 38025.0 mV 36026.5 mV Cathode Bias with 272DX is not practical; wattage will exceed max dissipation for 6V6. 300-ohm resistor is max recommended. Note B: Bias voltage ranges (unloaded) with these resis

2、tors, 272DX and 5U4G/5Y3: 15k 14 40 volts 22k 28 53 volts 47k 55 75 volts California Dreamer Plus” v. 2.6 Variation on the California Dreamer by Gino Iorfida for A Modifications by Dave Zeryck 1.5K 25- 25+ +180 v. 10pF +1.5 v. 12AX7 V1b 1M-A Vol 100K D .022 3.3M 220K 50K A Master 1 D 100K 12AX7 V3b

3、100kL 220K 470K +195 v. .1 500 pf .0047 12AX7 V3a D Reverb Tank 12AT7 V2 100K 25- 25+ 820 220K 2200 25- 25+ Dwell 1M A Reverb Trans 68K 1M 68K Normal 1.5K 25- 25+ 100K D 250pf 100K 250K-A Treble +180 v. +1.5 v. 12AX7 V1a .1 .022 250K-A Bass 10K-A Mid Up to 50K ohm can be sed for some boost here 40-5

4、00 Terminal of 40-20-20-20 500V multisection (JJ Electronics) + - 272DX: +394 (5Y3). +404 (5U4G) 100K 1W -+ 25-100 - + 15K 10-100 - + 22K 25K Lin SW 2 Standby. Bleeds caps to ground when off To all 6.3 v. heaters 2 Amp Fuse Sw 1 A/C 117 VAC 5Y3/5U4G/5AR4 Hammond 270EX (5AR4/SS), 272DX (5Y3/5U4G) 100

5、 1W 100 1W 1K 3W 1M 1W 36 v 100K + - 100 - 100 250 mAmp Fuse Fast Blow .001 22K470 1M 1M 47 .1 820 100K 5% 82K 5% .1 .1 220K 5% 220K 5% 12AT7 V4a 12AT7 V4b 1K 3W 1K 3W 1.5K 1.5K 6V6 V5 6V6 V6 1 ohm 1W 5%1 ohm 1W 5% 75 v 170v 180v 320v -36.5v 390v 392v Hammond 1608 Note A 47pF SW 5: Impedance Select

6、(4 or 8 ohms) 20-500 + - Choke +392v. 10K 1W 20-500 + - 10K 1W 20-500 + - D +282 v. Black and black+yellow Yellow: 8- ohm Yellow+Grn: 4-ohm C A B Pedal See note B 328 VAC 328 VAC 392v DC reference for heaters reduces noise +1.5 V 320 V 195 V Caps: 400 v min. Resistors: w 10% Voltages shown are with

7、272DX and 5Y3 117 VAC 5U4G yielded: Plate 404V, Screens 400V Notes on rectifiers: With a 272DX PT and the 1608, the amp has plenty of presence. A stiff rectifier (5U4G) can be a bit harsh. With a 5Y3, responsiveness is excellent and overdrive is round & musical. In neither case was there much headroom this design has a lot of gain. Past 3 on the volume is crunch territory, and maxed out this roars. The clean sweet spot is narrow. A 12AT7 in V1 would be recommended for cleaner players. RadioFans.CN 收音机爱 好者资料库