[Milsurplus] R388 Audio

[Rod Hogg]

OGH,

Per my R-388 manual is just a simple 6AQ5 audio output with 600 ohm
secondary and a 4 ohm tap.

The schematic is wrong in the manual from the text, as it states "The
SPEAKER and PHONE jacks are connected across the 600-ohm winding of the
transformer."  While schematic shows the Speaker jack connected to the 600
ohm tap and phone jack is connected to the 4-ohm tap.  Probably is 600 ohm
for headset, and schematic is a misprint. (TM 11-854) 600 ohm point also
feeds the rectifier, thru a 2200 ohm resistor, for the audio output meter
function.

Per the ST-6 specs I have, it is a 600-ohm unbalanced input, so, you can run
both at same time I would imagine. You might want to 'pad down' the 600
level as could be a little hot when running at a speaker level if using a 4
ohm speaker with it.

Rod
KØEQH




-----Original Message-----
From: milsurplus-bounces at mailman.qth.net
[mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of telegrapher at q.com
Sent: Wednesday, July 20, 2011 2:31 PM
To: milsurplus at mailman.qth.net
Subject: [Milsurplus] R388 Audio


Is there any reason you can't hook up to the 600 ohm output and 3.2 ohm
output at the same time.  I want a speaker on the 3.2 ohm output and to runa
cable from the 600 ohm output at the same time to an ST-6 for RTTY
reception.  I did notice that there was a reduction in audio from the 3.2
ohm connection when i hooked the ST-6 to the 600 ohm terminals.  Is that
right or should i not use them both at the same time/

Larry
W0OGH
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