"Larry W4CSC" wrote in message
...
Never, EVER connect two transistor amplifiers in parallel......


snip large story

Actually, in high power car systems, they do exactly what you just said that
cannot be done. In such systems, each channel has two amplifiers, carrying
the signal in opposite phase. The speaker is connected to both outputs. This
way, the maximum voltage that can be created across the speaker is doubled.

So based on this same principle, it would be possible to connect the speaker
between the hot wires of the outputs of the VHF and the radio..... The only
thing that spoils the fun is the fact that the DC blocking capacitor in
series with the output expects the speaker to be connected to ground. So an
extra electrolytic capacitor of 1000uF with the minus to one output and the
plus to one side of the speaker is needed. Another possible problem is the
power: both amplifiers must be able to withstand the power output of the
other. In the above example of a high power car system, this is the case.
However, the amplifier of a VHF will probably not tolerate the much higher
power of an average car stereo.

To make a long story short: take Larry's advice and don't do it. But
technically it is possible.

Meindert