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 Post subject: Hallicrafters SX-73 / R-274
PostPosted: Jan Thu 04, 2018 8:54 pm 
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Joined: Feb Fri 25, 2011 12:57 am
Posts: 2308
Location: 08033 Cherry Hill Jersey
Quite a nice radio here. I bought it at a hamfest for $40 - was kind of a sympathy buy - I really didn't want another reciever. The seller was convinced it didn't work, and oddly getting it home it picked up a few stations. Usually the opposite happens!
It had a burned out resistor, some out-of-tolerance resistors and some leaky bathtubs. Tune-up was pretty easy. The big challenge was cleaning the sticky ball bearings of the tuning condensers - took hours to get the bumpy spots cleaned out. The other issue was checking out the 6.455 oscillator - removing that resulted in cracking some dried out coax, so that had to be replaced.
I have yet to check the response of the selectivity positions, and in the mean time enjoying listening to it!

Image

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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Thu 04, 2018 10:56 pm 
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Joined: Jun Sun 19, 2011 2:31 pm
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I think you will enjoy the receiver and the Hallicrafters 3 position L/C with 3 position crystal selectivity system seems to be a perfect match for this radio. The use of a pair of "night light" lamps as VR tube current limiters was an interesting idea that I haven't seen in any other set.

One of the websites states the tuning mechanism is troublesome but both of mine operate beautifully with no sign of wear.

I found one at a hamfest several years ago that was stock except a two speed concentric tuning knob assembly was used in place of the regular knob but I kept it as is because the additional 4 to 1 reduction is really nice. Then several years ago a colleague told me she had run across some radio gear at a garage sale and asked if I was interested and I came home with a TMC GPR-90 and another SX-73 for an extremely low price. It is nice to have colleagues who know your interests. :)

Rodger WQ9E


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Thu 04, 2018 11:36 pm 
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Joined: Feb Fri 25, 2011 12:57 am
Posts: 2308
Location: 08033 Cherry Hill Jersey
Quote:
It is nice to have colleagues who know your interests

Absolutely - and the most interesting stuff comes your way.

I was able to pick up WWV at 5, 10, 15 mhz and not yet at 20, 2.5. I also got CHU 3330, 7850.
Interestingly I was listening in to some Hams talking, and took a cruise on 10m. Heard a couple of guys talking clear as day at 29. mHz about 1800 UTC. And one of the guys was from TX - I'm in Jersey. And it was AM??
Now I'm wondering how good this would be for HAM use.

In my case, one nightlight and one christmas bulb :mrgreen:
For those who haven't seem this:

Image

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Want 20's-30s rack transmitter
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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Thu 04, 2018 11:43 pm 
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Joined: May Fri 01, 2015 2:33 am
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Location: Roslyn,Pa 19001
29.0-29.1 or so is the AM window for 10mtrs.

Terry


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Thu 04, 2018 11:49 pm 
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Maybe replace your Christmas bulb with one of the old fashioned bubble lights for the holiday season :)

I have a HP-200A audio oscillator that uses a bulb as the non-linear resistance element in the Wien bridge circuit and I had to hand select the lamp for it for best waveform. I didn't try a bubble lamp in it but different same type lamps provided very different levels of sinewave distortion.

Rodger WQ9E


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Thu 04, 2018 11:56 pm 
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Joined: Feb Fri 25, 2011 12:57 am
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Location: 08033 Cherry Hill Jersey
Quote:
old fashioned bubble lights

I'll get back to you on this.

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Want 20's-30s rack transmitter
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KD2AZI


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 1:42 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1367
Location: Morris Plains, N.J. 07950
$40 at a Hamfest? Yikes. What hamfest was it? If I was there and missed it, I'm going out the nearest window head first! LOl.


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 2:00 am 
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Joined: Feb Fri 25, 2011 12:57 am
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Location: 08033 Cherry Hill Jersey
I think it was Gloucester City, NJ or Gloucester county - can't recall which!

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Want 20's-30s rack transmitter
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KD2AZI


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 2:55 am 
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Location: Portland, TN, USA
Joe Connor wrote:
$40 at a Hamfest? Yikes. What hamfest was it? If I was there and missed it, I'm going out the nearest window head first! LOl.


Indeed!

Being a generous sort, I wrote a post to him earlier offering to double his money but I must have forgotten to hit "Submit" before moving on.

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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 3:01 am 
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Joined: Jul Tue 21, 2009 1:38 pm
Posts: 920
Location: SW WA state
Nice catch! Doubly so with the price...
I have a hacked SX-73 I need to restore to stock when I get the time...
Reminds me of the Hamfest I went to where the guy had an AR-88 which I wanted desperately.
The guy said to make him an offer, and all I had was $30 in my pocket.
I didn't want to insult him, so I moved on.
Later on, I saw someone schlepping off the AR-88, and asked him how much he paid for it.
I nearly passed out when he said "$25!".
Enjoy your prize!

-Tom


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 3:22 am 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1367
Location: Morris Plains, N.J. 07950
Well, I wasn't at those hamfests, so I can rest easy.

Damn, an AR-88 for $25 or $30 is as crazy as an SX-73 for $40. I have never seen those kinds of bargains at a hamfest. If they're there, I suspect they're scooped up by guys who are wandering around with flashlights before daybreak watching the vendors unload their vehicles.


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 3:35 am 
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Joined: Feb Fri 25, 2011 12:57 am
Posts: 2308
Location: 08033 Cherry Hill Jersey
Well, it works both ways. From the same buy I bought both the SX-73 and a tek scope. He told me the SX-73 was dead and the scope worked for sure. So I paid $50 for the scope and it was dead as a doornail, and I still haven't figured out what's wrong with it.

Quote:
Damn, an AR-88 for $25 or $30

Ha! Great story!

Quote:
double his money

Sounds great! I have about 20 hours into it...let's see, profit $40/20hrs. $2/hour! A career in Radio.

I heard french-speaking station CKAC in montreal on 730 - having fun with this thing. Some kinks coming out: dial mask is moving, I don't think AGC is working, and selectivity switch is dirty.
I'd love to get one of those huge Hallicrafters speakers for it.

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Want 20's-30s rack transmitter
Stromberg 1A chassis
KD2AZI


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 4:06 am 
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Joined: Jul Tue 21, 2009 1:38 pm
Posts: 920
Location: SW WA state
Glad you're getting good reception!
Yes, those Hallicrafters speakers are NICE!
One of my two PM-23's is on the R-388.
My R-42's are in limbo waiting for the SX-42's to be restored.
Hope you can find a decent speaker. They are worth it!


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 Post subject: Re: Hallicrafters SX-73 / R-274
PostPosted: Jan Fri 05, 2018 5:55 pm 
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Joined: May Thu 12, 2011 1:28 am
Posts: 9
Location: Marblehead Massachusetts
Boy, someone got a great deal.

I bought mine at NEAR-Fest for a good price. It is missing the original dial lock and tuning knob. Anyone have a parts donor radio with these parts? I would love to hear from you.

w1rc@near-fest.com


73,

MisterMike, W1RC


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