Hi Jim,
What a wonderful rig the TR-4 was; I had the matching remote VFO/speaker 
cabinet into which you could slide the AC4 power supply. Also had the rig 
mobile in my dad's truck/camper. I also had dots at the 5Khz marks.
Albert S., WA7FXB
----- Original Message ----- 
From: "Jim Gammon" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, May 24, 2013 2:36 PM
Subject: Drake Tr-4


> When I had my Drake Tr-4 I had a ham friend mark the bezel every
> 5 KHZ with smaller dots.  Those Drake rigs had great linear
> tuning across the bands.  Pretty good for back in the 70's.  I
> also had an audible tuner that I still have, but it no longer
> functions.  That was hooked into a cheap Radio Shack SWR meter
> and I could tune for the highest tone out of the audio box.  Jim
> WA6EKS
>
> ----- Original Message -----
> From: Howard Kaufman <[log in to unmask]
> To: [log in to unmask]
> Date sent: Fri, 24 May 2013 06:44:18 -0500
> Subject: acessible radios
>
> All in the ear of the beholder.
> I started out with a johnson valiant.  I tuned the transmitter by
> pressing
> my ear to the metal case, and listening for the dip in hum.  I
> tuned the
> grid by listening to the click of the meter needle.  Later I
> counted the
> dial turns on the drake radios.  Since each turn was 25 khz, you
> could get
> with in 2 khz or so quite easilly.  I have wondered if a neon
> light coupled
> to a feed line could be read by an audible light probe.  How good
> would
> maximum brightness be?  Interesting experiment.  Then in the late
> 80's I
> bought a triton 4 and found the speech box that tentec made for
> it.  I
> thought I had died and gone to heaven.
> I have an Omni D and still have that box.  That's a backup radio.
> We've come a long way.
> H T Kaufman MSW LCSW
> Adaptive Technology Instructor
>