It was free and I was in high school.Ĭlick to expand.Anyone remember the Tenna Ranger Mindblower amplified 6 X 9 inch speakers? Same concept. It sounded OK, maybe kind of "soft" in a tube amplifier sense. The output stage had input transformers as well. I ran it off 17 volts and it gave it more kick. It delivered about 15 watts a channel off 12 volts. It used germanium transistors driving output transformers. I built an amplifier (a freebie) from an old Craig Power Play 8 track auto unit. You had to measure the actual Vceo of the individual transistor to make sure you were OK. If you just stuck a random 3055 in a circuit like this then you might be screwing up. I'm sure I've seen schematics with 3055's running off of more than 60 volts.Ī technician in the field would have to be aware of this. There are two ways this was accomplished.ġ) Output transformer, which MacIntosh still uses to this day.Ģ) "Curve" a batch of 3055's and select the ones with higher Vceo. Anyway, there were amplifiers built with a whole lot more than 40 watt output. I think this is why the industry standard for speaker impedance changed from 16 ohms to 8 ohms. The 60 volt (IIRC) Vceo of the 3055 limited the power into 8 ohms to about 40 watts before clipping.
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