Hi, gang!
I have my T-4X in front of me.? I was fortunate to have obtained my A Line from a friend who had had it in storage for around 20 years.? I have replaced the can cap and other electrolytics but otherwise, this is a completely unmolested set with a QC tag indicating that it was inspected on 11 May 1967 by 'WF' -- could have been Bill Frost :-)
The serial number is 13307B (yes, there is a letter on this one!) and is the second latest T-4X in Ron's database. Aside from the dust, it looks almost new.
I suspect that the change in the function switch occurred around the same time that the addition of the crystal characteristics and could have been Drake using up the last of the front panels and chassis before rolling out the B Line.? The mic jack is still on the front panel, the PLATE AMPS meter still goes to 0.4 and it completely appears the same as a T-4X, otherwise.
I will attach a photo of the function switch in a reply to this, as I'm composing this on my computer and took a photo with my phone (it's just easier...).
In the meantime, can any of you who have later T-4X's take a quick look at your transmitters?? In particular, the fastest way to see if it has the later function switch is to try transmitting SSB with a plug in the KEY jack.? If you can get modulation, it's the later version.? Also note the serial number.? This was a functional upgrade to the transmitter that is not really practical to retrofit..
Steve Wedge, W1ES/4
Time flies like an arrow.? Fruit flies like a banana.
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