[Boatanchors] Fw: tcs 12 transmitter microphone modification details

[Sandy]

I don't know what would "substitute" for the mike button in the UK!  The 
Western Electric "F1" or "T1" button/cartridge was by far, the best single 
button carbon microphone I have ever found.  They were once very plentiful 
or could be scrounged from old telephone handsets.  In the TCS the carbon 
mike via a transformer and some DC bias DIRECTLY drives the two 1625 
modulator tubes!  No preamplifier.  If you make a modification for a dynamic 
or electret mike it will require additional circuitry!

You "can" use the single button "military" carbon microphones, but it has 
been my experience that the output from all of them is too low to get a 
decent audio output level!  The TCS only runs ONE of the Tubes in the final 
stage PA stage on A3 'phone!  You are lucky to get 15-20 watts RF output MAX 
in "voice" mode.

Someone may have a diagram for "subbing" a dynamic or electret mike element 
which would probably work great, but presently I have no circuits.  I use my 
TCS-12 very little on A3 voice.  99% of operation is on CW.

Hope this helps a bit.

73,

Sandy W5TVW

-----Original Message----- 
From: CLIVE COLLINS
Sent: Tuesday, November 08, 2011 11:16 AM
To: boatanchor network
Subject: [Boatanchors] Fw: tcs 12 transmitter microphone modification 
details




Subject: tcs 12 transmitter microphone modification details


Gentlemen,
I have acquired a complete TCS12 system but with a useless microphone. I 
believe that there is a modification that enables a modern insert to be used 
or an 'electret' insert. Can anyone direct me to the modifications details 
please or mail me the circuitry.  This rig looks like it just came out of 
the shipping box, its been well cared for.
thanks in advance and regards

Clive GW3WEQ North Wales Coast UK
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