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 Post subject: ITT 6409A ---very unique radio !
PostPosted: Nov Wed 22, 2017 2:43 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Hello All,

During one of the typical Ebay browsing "sessions", saw this unique radio as a "Buy It Now" or "best offer". As usual, got excited when I saw that it had an air-variable cap and tuned-RF amp stage, so made a reasonable offer based on the inflated shipping charge and after one counter-offer go-round, got it... It came with it's original box and all accessories...

It arrived today and they had simply wrapped the display box in several turns of thin foam and a shipping bag---and sent it Parcel Post even with the high price charged for mailing. Picked up the package and it felt as though it had been crushed, so quickly opened it for inspection---the radio and accessories were fine, but the cover of box had been "mashed" down splitting all the corners and tearing the hinge area off back down to a shred. Sent a message to seller and waiting for response... Too bad since box was in nice condition otherwise and has a neat white satin cushioned liner.

Radio in really nice shape as if it didn't get much use with only a bit of leakage residue and corrosion in battery compartment. Installed batteries and radio worked somewhat with weak distorted audio once erratic volume control "wiggled"---but after a few minutes, it began to sound better then a slight "pop" and it performed and sounded great due to the caps "reforming" (they'll be replaced anyway). It's much bigger than I thought at 9" tall x 4.25" wide and has two additional chrome bands besides front panel (all metal, attached with screws) on sides with the center ones rising to the tubular handle---even the small earphone case has a chrome band across opening edge ! The interior is unique with a sub-mini volume/tone pot with concentric shafts (which I hope will "respond" to DeOxit Faderlube !), gear driven tuning, and an unusual 2 3/4" speaker with a "deeper" cone that sounds great. The transistors are Matsushita. The build date stamped on label is Sep. 13, 1963.

Just when I thought that I'd seen all the transistor sets with that tuned-RF amp stage I'm crazy about---another comes along !

Has anyone else had or seen one of these ???

Couple Ebay pics below... Stay tuned !

John


Attachments:
arf ITT 6490A Ebay pic1.jpg
arf ITT 6490A Ebay pic1.jpg [ 141.71 KiB | Viewed 642 times ]
arf ITT 6490A Ebay pic2.jpg
arf ITT 6490A Ebay pic2.jpg [ 155.42 KiB | Viewed 642 times ]
arf ITT 6490A Ebay pic3.jpg
arf ITT 6490A Ebay pic3.jpg [ 124.93 KiB | Viewed 642 times ]


Last edited by xrhonda91 on Dec Mon 04, 2017 3:24 am, edited 1 time in total.
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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 23, 2017 2:31 am 
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Joined: Nov Mon 26, 2012 1:21 am
Posts: 77
Nice find, John! Sweet condition. I don't remember seeing this exact model but I've seen other ITT transistor radios before, online.

Attached is an advertisement page from a magazine for ITT transistor radios.


Attachments:
ITT 6409.jpg
ITT 6409.jpg [ 27.76 KiB | Viewed 575 times ]
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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 23, 2017 2:35 am 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Wow Marty---thanks for posting Ad ! Do you have a higher-resolution pic of it you could e-mail me so I could read it ???

The performance & sound quality seemed great last night, but will be busy with family a few days, so won't be able to get back to it for awhile...

Have a Good Thanksgiving !

John


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 23, 2017 3:11 am 
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Joined: Nov Mon 26, 2012 1:21 am
Posts: 77
John, Sorry that's the scan as I found it. Maybe I can scan the internet and find something else. I'll let you know. Happy Thanksgiving!! Marty


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 23, 2017 5:18 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Thanks Marty---already searched and found the listing with a larger, readable image below description section.

Was looking at the unusual volume/tone combo control to see if there was access to wipers and fortunately each has an open slot...

John


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 23, 2017 4:31 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Hello All,

Enjoyed the owner's manual intro for this radio so much, thought I'd take a pic (can't scan because of glued binding) and share it---really neat ! Makes a person appreciate it even more...

Plan to post pics of all pages eventually for any who are interested...

Hope all have a Good Thanksgiving !

John


Attachments:
ARF ITT MANUAL INTRO.jpg
ARF ITT MANUAL INTRO.jpg [ 177.83 KiB | Viewed 532 times ]
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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 23, 2017 7:40 pm 
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Joined: Mar Thu 16, 2017 11:14 am
Posts: 29
Location: Amsterdam
a beauty


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Fri 24, 2017 5:16 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Thanks !

Sure looking forward to getting it done...

John


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Tue 28, 2017 7:32 pm 
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Joined: May Wed 01, 2013 10:05 pm
Posts: 1371
Location: Rayleigh, BC, CANADA
Nice radio John, interesting thumb wheel control arrangement.

_________________
Rocco


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Wed 29, 2017 1:38 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Thanks Rocco---controls not that practical as large as the radio is, but they help add to the "unique-ness".

John


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 30, 2017 4:58 am 
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Joined: Sep Fri 07, 2007 2:27 am
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Location: Grand Chute, Wisconsin
https://www.dropbox.com/sh/msxfcapqnboc ... nTcta?dl=0

That's a really cool radio.

.


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Nov Thu 30, 2017 1:38 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Thanks very much, Jim !

John


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Sun 03, 2017 5:48 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Hello All,

Got this radio (basically) completed today...

Disassembled, replaced all electrolytic caps, and cleaned. Didn't want to remove vol/tone ctl. assembly, so cleaned knobs in place carefully with Windex and Q-Tips. "Dosed" controls with DeOxit Faderlube. The tuning dial "background" is a piece of heavy vinyl tape over white plastic which is glued to chassis---the surface of that tape had become "sticky" and it was covered with debris which made its way into radio. Isopropyl alcohol removed all "crud" leaving clean, smooth surface.

This radio is "loaded" with chrome---even the accessory earphone case has chrome trim (see pic below) !

Reinstalled chassis and applied power---very low, distorted volume as before, then a "pop" and all sounded great ! Performance excellent all across band---both sensitivity & selectivity. Sound quality also very good with plenty of usable volume. The ANT trimmer needed to be backed out for maximum performance and RF trimmer had more effect with this set than usual. Adjusting the 4th IFT had a large effect where the others were nearly dead-on as they were. After "tweaking" performance shot up into the "outstanding" category ! The intermittent audio issue came and went and sometimes could be affected by tapping PCB. Tapped all components gently, but could not pinpoint problem area until it failed for a longer period. Out of curiousity, touched the audio output transistors and discovered one was very hot---tapped the area and sound came back normally and transistor cooled down. But was very surprised when I touched the other of the pair and heard a "hiss" in speaker---on top of the received signal ! Touching the other did not cause this. Apparently, this transistor is oscillating at high frequency (finger acting as antenna) ! No time left tonight to troubleshoot further, but fortunately have a matched pair of the identical transistors salvaged from a junked Panasonic pocket set recently... Am thinking that this problem is what led to the early "retirement" of radio years ago since it looks so good...


Project pics below in two posts since there are 20. Notice how large this set is compared to an early Royal 500.

John


Attachments:
1ARF ITT ORIG CAPS.jpg
1ARF ITT ORIG CAPS.jpg [ 167.37 KiB | Viewed 242 times ]
2ARF ITT HRDWARE.jpg
2ARF ITT HRDWARE.jpg [ 179.07 KiB | Viewed 242 times ]
3ARF ITT CAB-CVR CLN INSIDE.jpg
3ARF ITT CAB-CVR CLN INSIDE.jpg [ 245.17 KiB | Viewed 242 times ]
4ARF ITT SPKR FRT.jpg
4ARF ITT SPKR FRT.jpg [ 171.67 KiB | Viewed 242 times ]
5ARF ITT SPKR SIDE.jpg
5ARF ITT SPKR SIDE.jpg [ 137.94 KiB | Viewed 242 times ]
6ARF ITT SPKR INSTLLD.jpg
6ARF ITT SPKR INSTLLD.jpg [ 130.99 KiB | Viewed 242 times ]
7ARF ITT CHS BOT.jpg
7ARF ITT CHS BOT.jpg [ 191.65 KiB | Viewed 242 times ]
8ARF ITT CMPLT INS.jpg
8ARF ITT CMPLT INS.jpg [ 156.91 KiB | Viewed 242 times ]
9ARF ITT CMPLT BK.jpg
9ARF ITT CMPLT BK.jpg [ 111.03 KiB | Viewed 242 times ]
10ARF ITT CMPLT FRT.jpg
10ARF ITT CMPLT FRT.jpg [ 120.54 KiB | Viewed 242 times ]


Last edited by xrhonda91 on Dec Sun 03, 2017 5:54 am, edited 1 time in total.
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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Sun 03, 2017 5:51 am 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Here are the remaining project pics---please see previous post for 1st group...

John


Attachments:
11ARF ITT ACCESSORIES.jpg
11ARF ITT ACCESSORIES.jpg [ 196.31 KiB | Viewed 240 times ]
12ARF ITT MANUAL INS 1.jpg
12ARF ITT MANUAL INS 1.jpg [ 206.39 KiB | Viewed 240 times ]
13ARF ITT MANUAL INS 2.jpg
13ARF ITT MANUAL INS 2.jpg [ 222.85 KiB | Viewed 240 times ]
14ARF ITT MANUAL INS 3.jpg
14ARF ITT MANUAL INS 3.jpg [ 226.39 KiB | Viewed 240 times ]
15ARF ITT MANUAL BK.jpg
15ARF ITT MANUAL BK.jpg [ 92.68 KiB | Viewed 240 times ]
16ARF ITT EARPH-CASE BK.jpg
16ARF ITT EARPH-CASE BK.jpg [ 151.88 KiB | Viewed 240 times ]
17ARF ITT EARPH-CASE TRIM.jpg
17ARF ITT EARPH-CASE TRIM.jpg [ 162.12 KiB | Viewed 240 times ]
18ARF ITT CMPLT LFT FRT.jpg
18ARF ITT CMPLT LFT FRT.jpg [ 95.87 KiB | Viewed 240 times ]
19ARF ITT CMPLT RT FRT.jpg
19ARF ITT CMPLT RT FRT.jpg [ 97.5 KiB | Viewed 240 times ]
20ARF ITT SIZE-COMP ROYL 500.jpg
20ARF ITT SIZE-COMP ROYL 500.jpg [ 181.79 KiB | Viewed 240 times ]
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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Sun 03, 2017 7:04 am 
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Joined: Aug Fri 29, 2014 6:17 pm
Posts: 2351
Really cool rig John, what radio do you think is best for dx out of your collection?


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Sun 03, 2017 5:52 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Thanks db gain !

Many will probably disagree, but because of the easy to grip & turn knob, precise feel and "smoothness" of it's vernier tuning, and sound quality along with excellent sensitivity/selectivity---the Zenith Royal 705/66. This is the only portable I use regularly (the most "beat-up" looking one). Not quite the best in sensitivity in collection or capable of a lot of volume, but small & easy to use with very pleasant tone...

Am wondering if I should investigate the odd audio issue on this set with scope to satisfy curiosity, or simply pull output transistor pair, verify other component values, and replace ??? Would adding .003 uF caps between B & C increase stability---have seen this on Panasonic sets using same transistors ?

John


Attachments:
itt audio snip.JPG
itt audio snip.JPG [ 89.14 KiB | Viewed 227 times ]
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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Sun 03, 2017 6:39 pm 
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Joined: Nov Wed 14, 2007 11:37 pm
Posts: 1320
Could it be a hairline fracture in a trace?


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Mon 04, 2017 12:03 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Metzman---just don't know yet... Seems also to be thermal as radio almost always turns on cold with low, distorted audio and tapping PCB/components doesn't always have effect. That odd high freq. oscillation on just one of outputs, even when audio sounds normal makes me think that transistor is bad or unstable. Think I might get scope out when I have the time (and motivation)... Might also try tacking in those caps to see what happens. Do have freeze mist, but try to use it sparingly...

John


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Mon 04, 2017 1:43 am 
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Joined: Aug Wed 26, 2009 1:50 am
Posts: 1219
Location: Mount Pleasant UT 84647 (from Coventry, UK)
That is a good looking radio, and your restoration is excellent, as always.

Colin


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 Post subject: Re: ITT 6409A ---very unique radio !
PostPosted: Dec Mon 04, 2017 2:21 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4968
Location: Indianapolis, IN
Thanks much, Colin !

John


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