[Milsurplus] TM wanted to buy

[Jay Coward]

Hi Mike,
 The one I have looks to be never used as there are no mounting holes drilled. It is pre-wired with a PTT (SW-141-K), mic plug PL-68, a single wire and a shielded pair with lugs. The schematic glued inside the housing is hard to read as it is viewed at an angle and even with a magnifying glass is hard to decipher .Since it has a hard wired PTT already, would this pre-amp be used with the infamous throat mics? If there was only an instruction sheet, there must have been references in other TM's to use this pre-amp if... blah-blah...Do you know if it's called out in any "addtionall required equipment" ? I've also heard it was used with dynamic mics but I am not aware of mil dynamic mics for WWII radios.
 It's a neat little box and would be a cool add on.
 Thanks,
             Jay KE6PPF



-----Original Message-----
From: Mike Hanz <aaf-radio-1 at aafradio.org>
To: Jay Coward <jcoward5452 at aol.com>
Cc: milsurplus <milsurplus at mailman.qth.net>
Sent: Tue, Jul 10, 2012 1:38 pm
Subject: Re: [Milsurplus] TM wanted to buy


There was an instruction sheet included with the preamp, Jay, but I 
an't find mine at the moment.  There wasn't much to it, as I recall.  
ou need to keep the relay *energized* by grounding pin 4 when you are 
n receive mode.  You *un-ground* pin 4 when you want to transmit, so 
hatever combination of transmitter/interphone/microphone switch 
ontacts you need to use to accomplish that is about the only tricky 
art to it.  The rest is straightforward...+28volts B+, ground, input 
nd output.
73,
ike  KC4TOS
On 7/10/2012 3:36 PM, Jay Coward wrote:
>   Looking for TM for Packard-Bell Co. Pre-Amplifier Model K-1.