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 Post subject: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Fri 10, 2021 10:44 pm 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 7091
Location: Indianapolis, IN
Hello All,

This radio appeared for sale on FB a few weeks back in New Haven, IN which is east of Ft. Wayne. Looked to be in nice original condition, but had recently completed a black 500A (which was a mess) and price was outside my frugal budget. Curiosity got the best of me, though, when it hadn't sold and asked the seller for inside pictures. Was amazed and excited that it had all blue Raytheon transistors, chassis 7XT40Z. Contacted an old friend of mine in Greentown and told him about it. He bought it, but the seller didn't want to ship. In the meantime, I had acquired some old Ham equipment to detail clean and sell and he was very interested. Asked if he would consider this Zenith as partial trade and he agreed. It was about a 2.5 hour trip from here to pick it up, so made plans to visit another radio club friend nearby while in area. Radio belonged to seller's grandfather who had passed away this past April and had been pretty well cared for, but used. The graphics on both front and back (paint filled engraving) are excellent and the original "Independent Testing Laboratory" label still present and in decent condition. S/N 34762 for those interested...

Since this radio was in such good original condition and has the seemingly scarce Raytheon transistor equipped chassis, decided to do a very "sympathetic" refurb which included very careful removal of original electrolytics so that the leads weren't damaged and could be reattached if desired by a future owner. Also, no polish or wax of any type was to be used on cabinet parts---only performed a very careful detail cleaning. The old adhesive on battery cover label had "oozed" out from under edges and had "captured" a lot of dirt over the years---very carefully & slowly ran my fingernail around it and removed, then gently wiped off remaining thin residue avoiding contact with paper.

The radio was very clean internally except that there was leakage residue and corrosion in the battery compartment and spent hours carefully scraping contacts, then cleaning them with tiny wads of Scotchbrite clamped in hemostat tips with Windex. Used small strips of thin plastic and toothpicks along with pieces of paper towel dampened with Windex to clean all the other "nooks & crannies". The battery compartment center panel had some corrosion from battery leakage and paint has tiny bubbles around it where it had gotten beneath. VERY carefully just gently "patted" these areas with water-dampened, then dry pieces of soft paper towel to remove any residue as not to damage finish any further. The battery cover label which contains chassis info had been soaked with leakage at one time, but since most of it was still intact and wanted to preserve it, very carefully removed residue around edges with water-dampened, then dry pieces of paper towel and then VERY gently wiped surface with dry soft pieces until no more "loose" residue came off. The speaker mounting screw were also heavily rusted and took some effort with stainless-steel toothbrush under stream of water to remove. The battery removal ribbon was in excellent shape and was easily cleaned after removal. Since the cover label contamination can't be completely removed, cut a piece of thin, clear plastic film to place inside before installation to prevent contact with the freshly cleaned painted center panel and screws.

The original black electrical tape under top edge of speaker from factory still secure, so simply disconnected positive (gnd) end of 50 uF supply bypass cap from earphone jack terminal and left part in original position. Added its replacement below chassis adding teflon insulated wire to negative lead and sliding insulation over connection and to bottom of capacitor for neatness---then connected to upper chassis terminal strip. The others were installed as neatly as possible...

The tuner was very scratchy even after careful cleaning between plates, so carefully removed the brass rotor ground contact and cleaned with special PCB edge-connector "eraser" before applying tiny drops of DeOxit Gold liquid. Now tunes across band without noise... The volume control was/is noise-free...

The 1st IFT core had one side of adjustment slot broken and it was very tight---slowly & carefully worked it out and cleaned threads before turning it over to obtain "new" end...

After assembly and final alignment, radio works well and sounds good as seems typical.

There were no fishpaper "washers" beneath this set's volume and tuning knobs, so cut tiny pieces of 1/32" thick plastic to the "D" shape of shaft ends and inserted inside knobs before installation. This was plenty to keep them from contacting panel during rotation and it works very well.

This radio is a beauty, even with signs of wear noticeable when viewed closely. Had never owned a maroon 500 and this color really has a "regal richness" to it and it looks great in display cabinet. Too bad it doesn't have a clear back cover to show off those blue Raytheon gems !

Please "click" on pictures for a larger view if desired !

John


Attachments:
01ARF 500A 40Z BAT CVR LABEL 9-8-21.jpg
01ARF 500A 40Z BAT CVR LABEL 9-8-21.jpg [ 726.91 KiB | Viewed 739 times ]
02ARF 500A 40Z CHS BOT RT EDGE BEF 9-8-21.jpg
02ARF 500A 40Z CHS BOT RT EDGE BEF 9-8-21.jpg [ 518.05 KiB | Viewed 739 times ]
03ARF 500A 40Z CHS BOT LFT EDGE BEF 9-8-21.jpg
03ARF 500A 40Z CHS BOT LFT EDGE BEF 9-8-21.jpg [ 560.65 KiB | Viewed 739 times ]
04ARF 500A 40Z CHS BOT BEF 9-8-21.jpg
04ARF 500A 40Z CHS BOT BEF 9-8-21.jpg [ 882.3 KiB | Viewed 739 times ]
05ARF 500A 40Z CHS BOT INPROCESS 9-8-21.jpg
05ARF 500A 40Z CHS BOT INPROCESS 9-8-21.jpg [ 801.04 KiB | Viewed 739 times ]
06ARF 500A 40Z CHS BOT CMPLT 9-8-21.jpg
06ARF 500A 40Z CHS BOT CMPLT 9-8-21.jpg [ 982.68 KiB | Viewed 739 times ]
07ARF 500A 40Z RAYTHEON BLUES FRT 9-8-21.jpg
07ARF 500A 40Z RAYTHEON BLUES FRT 9-8-21.jpg [ 755.52 KiB | Viewed 739 times ]
08ARF 500A 40Z RAYTHEON BLUES BK 9-8-21.jpg
08ARF 500A 40Z RAYTHEON BLUES BK 9-8-21.jpg [ 658.05 KiB | Viewed 739 times ]
09ARF 500A 40Z CAB PCS CLN 9-8-21.jpg
09ARF 500A 40Z CAB PCS CLN 9-8-21.jpg [ 552.06 KiB | Viewed 739 times ]
10ARF 500A 40Z CMPLT INS 9-8-21.jpg
10ARF 500A 40Z CMPLT INS 9-8-21.jpg [ 552.66 KiB | Viewed 739 times ]


Last edited by xrhonda91 on Sep Fri 10, 2021 10:49 pm, edited 1 time in total.
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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Fri 10, 2021 10:45 pm 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 7091
Location: Indianapolis, IN
Here are the remaining pictures---please see previous post for 1st installment...


Attachments:
11ARF 500A 40Z CMPLT BK 9-8-21.jpg
11ARF 500A 40Z CMPLT BK 9-8-21.jpg [ 459 KiB | Viewed 737 times ]
12ARF 500A 40Z CMPLT FRT 9-8-21.jpg
12ARF 500A 40Z CMPLT FRT 9-8-21.jpg [ 529.55 KiB | Viewed 737 times ]
13ARF 500A PAIR 9-8-21.jpg
13ARF 500A PAIR 9-8-21.jpg [ 831.79 KiB | Viewed 737 times ]
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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 12:50 am 
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Joined: Nov Wed 14, 2007 11:37 pm
Posts: 1498
Wow, that's in great condition! Nice.


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 2:37 pm 
Member

Joined: Mar Sun 15, 2015 2:02 am
Posts: 125
The radio looks stunning John.

The Raython's being laid out like that and their color makes them
look like a group of precious jewels which they truly are :)


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 6:09 pm 
Member

Joined: Aug Sat 16, 2014 2:19 am
Posts: 2034
Location: Palos Verdes, CA
John - Did the Zenith 7XT40Z work when you first acquired it? I've read that about 5 percent of the Zenith 500 transistor radios had Raytheon transistors. I got close to buying a 7XT40Z once on eBay, but instead of accepting my offer, the seller changed the listing to "buy now" and someone bought it before I could complete the sale. Oh well! - Mark


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 6:22 pm 
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User avatar

Joined: Jul Fri 21, 2017 9:58 pm
Posts: 2885
Location: Erie, Pa.
xrhonda91 wrote:
Hello All,

This radio appeared for sale on FB a few weeks back in New Haven, IN which is east of Ft. Wayne. Looked to be in nice original condition, but had recently completed a black 500A (which was a mess) and price was outside my frugal budget. Curiosity got the best of me, though, when it hadn't sold and asked the seller for inside pictures. Was amazed and excited that it had all blue Raytheon transistors, chassis 7XT40Z. Contacted an old friend of mine in Greentown and told him about it. He bought it, but the seller didn't want to ship. In the meantime, I had acquired some old Ham equipment to detail clean and sell and he was very interested. Asked if he would consider this Zenith as partial trade and he agreed. It was about a 2.5 hour trip from here to pick it up, so made plans to visit another radio club friend nearby while in area. Radio belonged to seller's grandfather who had passed away this past April and had been pretty well cared for, but used. The graphics on both front and back (paint filled engraving) are excellent and the original "Independent Testing Laboratory" label still present and in decent condition. S/N 34762 for those interested...

Since this radio was in such good original condition and has the seemingly scarce Raytheon transistor equipped chassis, decided to do a very "sympathetic" refurb which included very careful removal of original electrolytics so that the leads weren't damaged and could be reattached if desired by a future owner. Also, no polish or wax of any type was to be used on cabinet parts---only performed a very careful detail cleaning. The old adhesive on battery cover label had "oozed" out from under edges and had "captured" a lot of dirt over the years---very carefully & slowly ran my fingernail around it and removed, then gently wiped off remaining thin residue avoiding contact with paper.

The radio was very clean internally except that there was leakage residue and corrosion in the battery compartment and spent hours carefully scraping contacts, then cleaning them with tiny wads of Scotchbrite clamped in hemostat tips with Windex. Used small strips of thin plastic and toothpicks along with pieces of paper towel dampened with Windex to clean all the other "nooks & crannies". The battery compartment center panel had some corrosion from battery leakage and paint has tiny bubbles around it where it had gotten beneath. VERY carefully just gently "patted" these areas with water-dampened, then dry pieces of soft paper towel to remove any residue as not to damage finish any further. The battery cover label which contains chassis info had been soaked with leakage at one time, but since most of it was still intact and wanted to preserve it, very carefully removed residue around edges with water-dampened, then dry pieces of paper towel and then VERY gently wiped surface with dry soft pieces until no more "loose" residue came off. The speaker mounting screw were also heavily rusted and took some effort with stainless-steel toothbrush under stream of water to remove. The battery removal ribbon was in excellent shape and was easily cleaned after removal. Since the cover label contamination can't be completely removed, cut a piece of thin, clear plastic film to place inside before installation to prevent contact with the freshly cleaned painted center panel and screws.

The original black electrical tape under top edge of speaker from factory still secure, so simply disconnected positive (gnd) end of 50 uF supply bypass cap from earphone jack terminal and left part in original position. Added its replacement below chassis adding teflon insulated wire to negative lead and sliding insulation over connection and to bottom of capacitor for neatness---then connected to upper chassis terminal strip. The others were installed as neatly as possible...

The tuner was very scratchy even after careful cleaning between plates, so carefully removed the brass rotor ground contact and cleaned with special PCB edge-connector "eraser" before applying tiny drops of DeOxit Gold liquid. Now tunes across band without noise... The volume control was/is noise-free...

The 1st IFT core had one side of adjustment slot broken and it was very tight---slowly & carefully worked it out and cleaned threads before turning it over to obtain "new" end...

After assembly and final alignment, radio works well and sounds good as seems typical.

There were no fishpaper "washers" beneath this set's volume and tuning knobs, so cut tiny pieces of 1/32" thick plastic to the "D" shape of shaft ends and inserted inside knobs before installation. This was plenty to keep them from contacting panel during rotation and it works very well.

This radio is a beauty, even with signs of wear noticeable when viewed closely. Had never owned a maroon 500 and this color really has a "regal richness" to it and it looks great in display cabinet. Too bad it doesn't have a clear back cover to show off those blue Raytheon gems !

Please "click" on pictures for a larger view if desired !

John


Great find.

Congratulations!


:mrgreen:

_________________
"Invisible airwaves crackle with life
Bright antenna bristle with the energy"


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 9:23 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 39304
Location: SoCal, 91387
Excellent pickup, John!

How is the DX performance of this set, as compared to any of your others with Sylvania Transistors?

_________________
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\He Who Dies With The Most Radios Wins/////////////////////////


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 9:38 pm 
Member

Joined: Sep Fri 14, 2018 11:18 pm
Posts: 68
Location: Livorno, Italy
A beautiful set, really. Congratulations!
Best regards
Daniele


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 10:48 pm 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 7091
Location: Indianapolis, IN
Thanks much, everyone !

Mark---No, only "hiss" when power applied, no reception whatsoever. Because of the scarcity of the Raytheon equipped units, spent more time "playing" with this set and used test leads to bridge electrolytics with new one-by-one---forgot to mention this earlier. When audio coupling cap at volume control bridged with new, radio did work with decent, but lower than normal volume. Next, bridged the emitter bypass cap on audio driver---volume increased significantly and sound quality noticeably better. Bridging the AGC and supply bypass caps made no noticeable difference.

Richard---the performance seems nearly identical to the Sylvania equipped model, but sound quality may be a "tad" better (though that could be due to speaker differences as this set has a small hole at top of voice-coil form just below dust-cap which I've never seen before)...

John


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sat 11, 2021 11:41 pm 
Member

Joined: Aug Sat 16, 2014 2:19 am
Posts: 2034
Location: Palos Verdes, CA
John - Thanks for the information on restoring the Zenith 500 7XT40Z. I've always thought that the Zenith 500 was the best of the early transistor radios as they used 4 - AA batteries and are easier to repair, compared to models offered by other manufacturers. - Mark


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sun 12, 2021 4:52 am 
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Joined: Sep Sat 29, 2012 6:32 pm
Posts: 1021
Location: 13760
What a fantastic find! I've always loved the look of those Raytheon transistors, they really are like little jewels. You did a great job on the restoration too, it looks near mint now!


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Sun 12, 2021 4:53 pm 
Member

Joined: Oct Mon 26, 2009 10:02 pm
Posts: 7091
Location: Indianapolis, IN
Thanks Matt !

Fortunately, it had pretty good care other than the battery compartment. Seller believes that his grandfather bought it new (he would have been in his early 20’s) and only used it at work.

John


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Mon 13, 2021 6:30 pm 
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Joined: Aug Sat 16, 2014 2:19 am
Posts: 2034
Location: Palos Verdes, CA
Most of the Zenith 500s that I have in my collection were used so much that the lettering on the cover is worn off. I imagine the owners must have had their radios in the Zenith leather case and over the years, removing the radio to change the batteries wore off the lettering.


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 3:55 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 625
Found this information in a 1955 service manual.


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Zenith Royal 500 001.jpg
Zenith Royal 500 001.jpg [ 627.84 KiB | Viewed 443 times ]
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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 3:56 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 625
Royal 500


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Zenith Royal 500 002.jpg
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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 3:57 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 625
Royal 500


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Zenith Royal 500 003.jpg
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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 4:21 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 625
Royal 500


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Zenith Royal 500 004.jpg
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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 4:21 pm 
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Joined: Dec Mon 23, 2019 5:52 pm
Posts: 625
Royal 500


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 4:34 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 7091
Location: Indianapolis, IN
Thanks Danny !

John


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 Post subject: Re: Zenith Royal 500A with 7XT40Z Raytheon chassis !
PostPosted: Sep Wed 15, 2021 6:59 pm 
Member

Joined: Sep Fri 14, 2018 11:18 pm
Posts: 68
Location: Livorno, Italy
The color of chassis label inside the battery cover reflects the color declared for the "color dot" of the corresponding model. However, on one of my two Royal 500 A's (only two, unfortunately) the dot color is an undocumented blue (chassis 7XT40Z1). I remember I saw a photograph around on the web of at least another "blue dotted" 7XT40Z1 like mine. Could it be the result of a chemical alteration of the original color green?
Best regards
Daniele


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