From: Garey Barrell 
Subject: Re: [drakelist] TR-7 and TR-7A


Garey Barrell  made an utterence to the drakelist gang
----------------------------------------------------------------------
Paul -

I don't "think" there were any TR-7As produced with the one-piece rear 
panel, but Drake DID offer to "update" any TR-7 to an
"A" version.   So 
it's possible that an "early" unit was updated by Drake. 

OR, since Drake abandoned a long-term "anti-counterfeiting" policy when 
they sold out their parts stock a few years ago and sold just the 
plastic strip for the front panel, it's quite likely that there are 
units of all ages out there with "A" strips and nothing else!

The differences were almost all previous "optional accessory" items 
being made "standard" in the A model, so there's no real added value to 
a "real" A versus a "converted" A.   The Noise Blanker,
500 Hz filter, 
and a previously unused phono connector on the rear panel was designated 
"TX" and wired in parallel with the microphone input.  Probably the best 
indicator of an A is the RC network installed in filter position "B" as 
a pseudo AM B/W filter, similar to the 150 resistor that was shipped in 
the AM filter position in the R-4C.  There was also a gas discharge 
surge arrestor added, located across the RFC to ground on the RX ANT but 
I think those were added to just about any TR-7 that came back to Drake 
for work.

I think the "A" appeared around s/n 11,000.

There is an excellent article on the variations at

http://www89405.temp.w1.com/DrakeArticles/TR7_Comparison_Article/TR7_Idenity-01.htm>

73, Garey - K4OAH
Atlanta


Paul G4CCZ wrote:

>"Paul G4CCZ"  made an utterence to
the drakelist gang
>----------------------------------------------------------------------
>Hi All,
>
>Can anyone please help me with a question about the TR-7 and TR-7A 
>
>Did Drake make all the 7A's with the split rear panel or were any produced
>with the single plate rear panel as on the early TR-7's?  And what was the
>first serial number approx of the 7A
>
>Thanks
>
>Paul
>G4CCZ
>  
>
----------------------------------------------------------------------
On Behalf of Garey Barrell 
Submissions:        drakelist{at}www.zerobeat.net
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Zerobeat Web Page:  http://www.zerobeat.net
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
----------------------------------------------------------------------

---