Forums :: Resources :: Features :: Photo Gallery :: Vintage Radio Shows :: Archives :: Books
Support This Site: Contributors :: Advertise


It is currently Feb Fri 24, 2017 11:25 am


All times are UTC [ DST ]





Post New Topic Post Reply  [ 17 posts ] 
Author Message
 Post subject: Hallicrafters SX-28A question
PostPosted: Dec Thu 29, 2016 5:39 pm 
Member
User avatar

Joined: Jan Tue 13, 2009 6:02 am
Posts: 320
Location: Minneapolis, MN 55304
On my SX-28A there's a screw through the front panel held by a hex nut behind the panel adjacent to the 10 o'clock position of the main tuning knob logging scale. The screw doesn't fasten anything to the panel so I'm wondering what it's purpose is?

I also notice that images posted online show that some sets have the screw while others don't... Is it only found on later 28s or 28As?


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 4:12 am 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 2845
Location: Seattle WA US
My very early -28, and my very late Navy -28 do not have this screw, or a hole for it.
73
Chuck


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 5:05 am 
Member

Joined: Oct Sun 15, 2006 12:57 pm
Posts: 4982
My early 28A doesn't have that screw either. No idea what it might be for.

Mike

_________________
Bold text & pics are usually links.

Mike


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 12:50 pm 
Member

Joined: Mar Sun 09, 2008 12:32 am
Posts: 1482
Location: Dallas Texas
I'm confused but that's not new. Can you post a pic of what you're talking about. I've got a bunch of 28's of all vintages in storage and will take a look this afternoon.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 3:06 pm 
Member
User avatar

Joined: Jan Tue 13, 2009 6:02 am
Posts: 320
Location: Minneapolis, MN 55304
Shanghai Jack wrote:
I'm confused but that's not new. Can you post a pic of what you're talking about. I've got a bunch of 28's of all vintages in storage and will take a look this afternoon.


Mine's on the bench upside down with the panel facing away for RF rebuild so it's not practical to get a picture of the front right now but here are a few links that have the screw:

http://www.cryptomuseum.com/df/sx28/img/300413/007/full.jpg
http://i.imgur.com/vcwDz.jpg?1
http://www.radioblvd.com/SX-28/grr2&pan1.jpg

Look straight down from the center of the meter to the edge of the tuning log. It's roughly across the log scale from the right hand panel mounting screw.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 7:32 pm 
Member

Joined: Jan Thu 01, 1970 1:00 am
Posts: 2845
Location: Seattle WA US
Here's a straight-on view. Photo was labelled "SX-28AU". Sorry I can't credit online source.
-Chuck
Attachment:
SX-28AU dial lock (2).jpg
SX-28AU dial lock (2).jpg [ 116.24 KiB | Viewed 727 times ]


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 7:40 pm 
Member

Joined: Mar Sun 09, 2008 12:32 am
Posts: 1482
Location: Dallas Texas
I have a couple of AU in storage, I'll see if they have the screw and if anything is attached.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 7:58 pm 
Member

Joined: Mar Sun 09, 2008 12:32 am
Posts: 1482
Location: Dallas Texas
You probable already did this, but the original sx-28 and 28A manuals don't show a screw in that position.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 8:16 pm 
Member

Joined: Mar Sun 09, 2008 12:32 am
Posts: 1482
Location: Dallas Texas
Okay, at the storage unit. 9 of 9 SX28's/28A's have no screw and no hole for a screw. Both SX28AU's have the hole and the screw, Without bringing one home and taking the bottom panel off I can't tell where the screw goes or what it does but I can see a screw fastened with a nut that exits the rear of the gear box that is in the same/similar position relative to the front panel. Not a lot of help yet, but when I can get the storage unit unpacked I may have an answer.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 10:33 pm 
Member
User avatar

Joined: Jan Tue 13, 2009 6:02 am
Posts: 320
Location: Minneapolis, MN 55304
Shanghai Jack wrote:
Okay, at the storage unit. 9 of 9 SX28's/28A's have no screw and no hole for a screw. Both SX28AU's have the hole and the screw, Without bringing one home and taking the bottom panel off I can't tell where the screw goes or what it does but I can see a screw fastened with a nut that exits the rear of the gear box that is in the same/similar position relative to the front panel. Not a lot of help yet, but when I can get the storage unit unpacked I may have an answer.


Thanks Jack. Don't unpack anything on account of my question. It's not that important.

I'm not familiar with the "AU" designation. Is that a later or military version of the 28A?


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Fri 30, 2016 11:12 pm 
Member

Joined: Mar Sun 09, 2008 12:32 am
Posts: 1482
Location: Dallas Texas
It's the dual voltage model with a switch on the to of the yransformer


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Sat 31, 2016 7:35 am 
Member

Joined: Feb Mon 25, 2013 8:37 pm
Posts: 512
Location: Seattle, WA
I have an early 1945 model--never modified. It has the screw with a nut in back that seems to do nothing?!?

Don F


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Sat 31, 2016 5:18 pm 
Member
User avatar

Joined: Nov Tue 18, 2008 8:34 am
Posts: 1114
Location: Hutchinson,Kansas
This is from Radio Blvd............

Upper Panel to Cabinet mounting screws (flanking main tuning dial) are being used by SN H-124230 (12/40) - Interestingly, even the earliest cabinets always did have the two tabs to accept these screws however the front panel was not drilled for these two screws until around 12/40.

Perhaps this is an answer to the question?

http://www.radioblvd.com/SX28Notes.html


Todd


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Dec Sat 31, 2016 5:52 pm 
Member
User avatar

Joined: Jan Tue 13, 2009 6:02 am
Posts: 320
Location: Minneapolis, MN 55304
Thewasp wrote:
This is from Radio Blvd............

Upper Panel to Cabinet mounting screws (flanking main tuning dial) are being used by SN H-124230 (12/40) - Interestingly, even the earliest cabinets always did have the two tabs to accept these screws however the front panel was not drilled for these two screws until around 12/40.

Perhaps this is an answer to the question?

http://www.radioblvd.com/SX28Notes.html


Todd


I believe that statement addressed the screws on either side of the tuning dial escutcheon that fastened the top of the front panel to the cabinet.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Jan Fri 06, 2017 2:24 pm 
Member

Joined: Mar Sun 09, 2008 12:32 am
Posts: 1482
Location: Dallas Texas
Just picked up another 28A last night and it has the screw. Will start teardown tonight and will report if there is any
thing attached.


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Jan Tue 10, 2017 5:21 am 
Member

Joined: Aug Fri 29, 2014 6:17 pm
Posts: 2242
Be sure to tell Radio Boulevard the serial numbers on your 28s;
http://www.radioblvd.com/SX28Notes.html


Top
 Profile  
 
 Post subject: Re: Hallicrafters SX-28A question
PostPosted: Jan Thu 12, 2017 4:25 pm 
Member

Joined: Feb Tue 12, 2008 4:24 pm
Posts: 417
Location: Virginia
My 28A has one as well. Was never able to track down any info either, but speculate that it may be related to left over WWII panels that may have had a lug or terminal strip mounted back there for some military contract like diversity, etc. Again - it's just a guess. Hallicrafters, National, and probably other manufacturers were known for using up as much of their WWII stock as possible on postwar gear. I've seen numerous postwar civilian HROs sporting an IF or two with MFP coating, for example, while other cans are bare aluminum.

RCA did this on a prewar receiver I have simply for symmetry. Added a screw and dress washer with no other purpose. Of the 3-4 others I've seen, each had the same. They also added a dummy tuning eye bezel with a lens and bulb behind it that lights in standby.


Top
 Profile  
 
Post New Topic Post Reply  [ 17 posts ]  Moderator: Sandy

All times are UTC [ DST ]


Who is online

Users browsing this forum: MSNbot Media and 5 guests



Search for:
Jump to:  
cron




















Privacy Policy :: Powered by phpBB