[Drake] Tr7 Tr7A ?????

[Stephen C. Finch]

Lee,

This is from the TR7A Service Manual.

Steve 
AIØW

TR7/TR7A SUPPLEMENT 

The following accessories and modification have, been added to update your
TR7 to a TRTA for more versatility. 

1) A noise blanker (NB7) has been installed. 

2) A 500 Hz filter (SL500)) has been Installed in selectivity position ‘A’. 

3) Selectivity ‘B’ has been adapted to provide a bandwidth of 9 kHz for AM
reception. 

4) A surge protection device has been added to the receive antenna Input to
provide additional protection from static discharges from lightning. 

5) The phone jack at the rear panel labeled ‘TX’ has been added to provide
transmitter audio input from sources other—than the microphone.  Possible•
uses include phone patches and radio teletype terminal units. This jack is
connected in parallel with pin 1 of the front panel microphone jack. 

© R. L DRAKE COMPANY 1978 

PRINTED IN U.S.A. 


-----Original Message-----
From: drake-bounces at mailman.qth.net [mailto:drake-bounces at mailman.qth.net]
On Behalf Of L.D. Ritta
Sent: Friday, January 28, 2005 3:29 AM
To: drake at mailman.qth.net
Subject: [Drake] Tr7 Tr7A ?????

Howdy folks,

I am new to Drake and was wondering how is the Tr7A different from the Tr7?
What is needed to upgrade to a Tr7A

Do I want to?

 

73''s Lee.