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Tube mono-block amp with SIX 6L6 outut tubes
I found a schematic of a stereo amplifier containing TWELVE 6L6 audio
output tubes. But aside from sharing the power supply, it's two mono-blocks with each having SIX 6L6 output tubes. Unfortunately, I was not able to get any real detailed information on this. I compared it to several guitar amp schematics which use FOUR 6L6 tubes in push-pull parallel, and this is very similar. It just has 3 tubes on each side of the phase, rather than two. The plates are all wired together and cathode / grid components are duplicates to each tube. They did use as bias adjust potentiometer on each tube, which I have not seen on the guitar amps. Obviously the purpose is to increase wattage output. I'm not intending on building this, but it's interesting and makes me wonder if someone could use EIGHT 6L6 tubes, or TEN? (Of course adding more tubes mean bigger audio output transformers and heftier power supplies. Another question that comes to mind is the impedience of the primary on the audio output transformer. Assuming I could find a transformer that would handle the wattage, would the impedence be the same as those used with FOUR 6L6 tubes, or would that change since there are two more tube plates connected in series. Anyhow, looking at this schematic makes me think that any PPP amp with FOUR tubes could have more output tubes added, as long as power supply current is available and a suitable audio output transformer is obtainable. |
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