[R-390] R-390 Non-A...have a question

[Roger Ruszkowski]

John,

You have to remember the Audio out is 600 ohms and only a 1/2 watt at best.

There is no indication in your post that you have used a 600 ohm speaker or that you are
running a transformer (70 volt  speaker transformer) between the output and your speaker.

How much power out are you getting.

Your AC volt meter may have a DB scale on it or you can read AC volts and 
convert  the value to watts. you are looking for about 15 to 17 volts AC across
a 600 ohm resistor ( two each 1200 ohm in parallel makes a nice 1/2 or 1 watt 
load resistor).

You may have poor audio output. But you only get a 1/2 watt and if you are
not matching the 600 ohm output to the speakers the level will be very low.

Radio shack use to have matching transformers mostly used for taping
several speakers in an area to a single PA amplifier. they come under several names and
in different power ratings. As you only have a 1/2 watt to work with any 4 or 5 watt
size will work. Some pair of taps on the primary and some pair of taps on the secondary
will match the 600 ohms to a 4 or 8 ohm speaker or set of head phones and provide
good listening level audio. If you need more than the 1/2 watt then use the
line out audio into a PA amplifier and speakers.

Roger AI4NI