Stereo amp with four 6L6-G power output tubes in each channelgreenspun.com : LUSENET : Glass Electronics : One Thread |
Would it be fully feasible to get about 100 watts per channel output in an amplifier of class AB type with four 6L6-G beam power tubes in each channel? Would a separate transformer and rectifier be needed for each channel, or if the power output chassis had just one transformer with dual 5V4-G rectifiers, 2 6SN7-GT phase inverters and eight 6L6-G power outputs, and another chassis had its own transformer and 5U4-G rectifier, four 6SN7-GT pre-amplifiers, one 6SK7 AM RF, 6SA7 AM Conv, 6SK7 AM IF, and 6H6 AM Det-AVC FM AFC, 6BA6 FM RF, 12AT7 FM OSC-Mixer, 6BA6 FM IF, 6BA6 2nd FM IF, and 6AL5 FM Ratio Detector.
That is a total of 26 tubes, five of which are miniature types. Three of the tubes are power rectifiers, and two are signal rectifiers. Add one more for a tuning indicator and that makes 27 tubes for a 200 watt output (since in AM and FM positions output will be mono, stereo for tape/phono/CD/or Tele). Add two more tubes (12AX7) for magnetic phono pre-amp.
That gives us a total of 29 tubes. Here they are in a more orderly fashion:
Tube compliment in power output chassis V1 6SN7-GT Left channel voltage amplifier and phase inverter V2 6SN7-GT Right channel voltage amplifier and phase inverter V3 6L6-G Left channel push-pull output V4 6L6-G Left channel push-pull output V5 6L6-G Left channel push-pull output V6 6L6-G Left channel push-pull output V7 6L6-G Right channel push-pull output V8 6L6-G Right channel push-pull output V9 6L6-G Right channel push-pull output V10 6L6-G Right channel push-pull output V11 5V4-G Rectifier V12 5V4-G Rectifier
Tube compliment in tuner-preamp chassis V13 6SK7 AM Radio Frequency Amp V14 6SA7 AM Converter V15 6SK7 AM IF Amp V16 6H6 AM Det-AVC FM AFC V17 6BA6 FM RF Amp V18 12AT7 FM Oscillator &Mixer V19 6BA6 1st FM IF Amp V20 6BA6 2nd FM IF Amp V21 6AL5 FM Ratio Detector V22 6E5 Tuning indicator V23 6SN7-GT Left cathode follower input and treble amp V24 6SN7-GT Left bass amp and AF amp V25 6SN7-GT Right cathode follower input and treble amp V26 6SN7-GT Right bass amp and AF amp V27 12AX7 Left magnetic phono pre-amp and RIAA equalizer V28 12AX7 Right magnetic phono pre-amp and RIAA equalizer V29 5U4-G Rectifier If the power supplied by the transformer and two 5V4-G rectifier tubes (525ma max) is sufficient, then it could be feasible to omit the 5U4-G tube and feed the whole reciever from a single power source.