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 Post subject: Zenith H724 Photo fact string wrong
PostPosted: Dec Sun 03, 2017 2:27 am 
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If you work on one of these, be aware that the dial string diagram on the Sam's Photofact is incorrect. Start with the tuning wheel all the way to the right (gang open), wrap around the tuning wheel the go onto the pointer wheel and pin, then the tuning knob shaft 2.5 times, then back around the shaft on the gang and to the spring. The spring is in a different position that is shown on the Photofact.

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Dec Sun 03, 2017 4:52 pm 
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I don't have that Photofact. Does it have the same diagram as Dial Cord Stringing Guide DC-3?

Image

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Dec Mon 04, 2017 4:48 am 
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Yes, and that is wrong. The opening in the wheel 9n the tuning gang needs to be 180 degrees from where it is shown on that sketch. The string goes out that opening, the to the left and around that wheel to the dial indicator wheel.

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Mon 02, 2021 2:48 am 
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Hi Stephen,

I know this is a few years old - but thanks for this. I just finished restoring an H724Z2 and I could not get the dial string to tune up past around FM 103 - no matter what I did. I got so frustrated I just buttoned it up as-is and was prepared to writ off as unfixable (by me, anyway). Of course, I was following the PhotoFacts diagram and instructions which seems to have been copied by others. I will give your instructions a try and see if it helps.

is my very first restoration and I am very pleased with the result. FM sounds amazing. We were listening to it all through the evening tonight.


Dean
KK4DAS


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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Mon 02, 2021 4:25 pm 
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FStephenMasek wrote:
If you work on one of these, be aware that the dial string diagram on the Sam's Photofact is incorrect.

I have modified that image to help those working with that diagram. Is this substantially correct?

Image

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Mon 02, 2021 9:40 pm 
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I will look and report back here.

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Wed 04, 2021 1:39 am 
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Thank you Stephen - a photo or drawing would be awesome.

73,
Dean
KK4DAS


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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Wed 04, 2021 2:12 am 
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Sorry, but I sold or gave away that radio.

Just do what I did - experiment to see what happens. Simply leave the string long, so you do not waste it if it does not work.

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Tue 10, 2021 1:19 am 
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The dial string drawing in Riders from Nostalgia air for the Zenith model H724 is correct. I referenced the drawing to replace my broken cord with no issues.

http://www.nostalgiaair.org/Resources/569/M0025569.htm


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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Tue 10, 2021 4:16 pm 
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That is the same diagram found in the Sams dial cord books except that I see no indication of whether the cap plates are open or meshed..

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Tue 10, 2021 9:46 pm 
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Sorry I checked and was thinking of my model 725 not 724. But although a little different setup I think it gives us the answer your looking for.

It should work to use Dale's drawing of the DC-3 with gang fully closed with the following exception. Position the center reel in the drawing to position its peg at about the 11 o'clock position not the six position shown. In my model 725 both the tuner and center reel peg start at about the 11 o'clock position with gang fully closed.

Anyway string the cord beginning at the top side of tuner to go almost directly to the center reel peg then around the backside of reel about 1 - 1/4 turn then to the control shaft and back up to tuning cap. Bottom line the extra turn plus of dial cord on the center reel should allow its full rotation across the tuning range. Hope this makes sense.


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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Wed 11, 2021 3:16 pm 
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dacsman wrote:
Position the center reel in the drawing to position its peg at about the 11 o'clock position not the six position shown

Where is the peg with the gang fully open? This thread has always been about stringing the H724 with the gang fully open.

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 Post subject: Re: Zenith H724 Photo fact string wrong
PostPosted: Aug Fri 13, 2021 9:53 pm 
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Just happened across a H724 chassis for sale on ebay. From what I can discern from those photos the second photo you posted Dale with gang open ( numbered 1448 ) may be correct. Note the tuning capacitor reel in attached photo is larger than the pegged center reel as shown in your drawing. So since they are not the same size reels they will not move at the same rate. The center wheel peg may possibly need to be adjusted further clockwise at gang open rather than 6 o'clock but should be a good starting point. You will know right away if you can't get tuner gang to fully closed once strung.


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