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telegrapher
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Post subject: Zenith band switch Posted: Jun Thu 28, 2012 4:11 am |
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Joined: Feb Thu 24, 2011 3:13 pm Posts: 155 Location: Ironwood, MI
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I am working on a Zenith 7 S 4 5 0. The band switch has 4 positions...Automatic (for the push button selector), BC, Short wave 1 and Short wave 2. I think.
Can anyone tell me the clockwise order that appears on the cabinet? I think the knob points to auto at its furthest counterclockwise rotation, then moving clockwise I bellieve next is BC but I am unsure if "click 3" is SW 1 and "click 4" is SW 2 or vice versa. Don't have the cabinet and the schematic is very nebullous about the the coils so wire tracing is a slow go. Thanks for the help.
Last edited by telegrapher on Jun Thu 28, 2012 2:43 pm, edited 1 time in total.
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magicclocks
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Post subject: Re: Zenith band switch Posted: Jun Thu 28, 2012 6:50 am |
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Joined: Jan Tue 03, 2012 10:38 pm Posts: 546
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Actually it may be long wave and medium wave. Or med and short something like that No
but I'm not positive. I believe you have the first two correct
_________________ DIGITAL CIRCUITS ARE MADE WITH ANALOG PARTS
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Oldbear
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Post subject: Re: Zenith band switch Posted: Jun Thu 28, 2012 2:09 pm |
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Joined: Jan Thu 01, 1970 1:00 am Posts: 3777 Location: St. Louis, MO, USA
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Quote: ...I am working on a Zenith 4 S 4 5 0... Is that a typo? WIth Zenith, the 1st digit (or two) indicates the number of tubes. That would mean a 4 tube radio. And with push-buttons and two SW bands? Not too likely. Maybe you mean 7S450?
_________________ Terry Davidson
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telegrapher
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Post subject: Re: Zenith band switch Posted: Jun Thu 28, 2012 2:41 pm |
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Joined: Feb Thu 24, 2011 3:13 pm Posts: 155 Location: Ironwood, MI
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You are absolutely correct Terry...I am afraid I "fat fingered" the model number. It is indeed a 7 S 4 5 0.
As for the previous reply to my posting, no there is no long wave. The 3 bands are 550-1500 KC, 1600 KC to 5 MC and 6-18 MC. There's a little play beyond the ranges which apparently was Zenith's answer to "continuous coverage" although, on first glance, a consumer might not realize it.
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eeprof
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Post subject: Re: Zenith band switch Posted: Jun Thu 28, 2012 4:23 pm |
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Joined: Mar Sat 28, 2009 8:27 pm Posts: 350 Location: Georgia
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According to my zenith manual: Moving from the most counterclockwise switch position it is Automatic - Std. Brdcst - Short Wave 1 - Short Wave 2
I recently restored a similar chassis for a customer which included a complete refinish and I found it helpful to slide a piece of card stock over the bandswitch shaft and then instlal the knob with chassis in cabinet. I then positioned the bandswitch knob so that it would rotate symmetrically and traced the positions with a pencil on the card stock in order to have an accurate template to install the new decals. Worked great. Tom
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telegrapher
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Post subject: Re: Zenith band switch Posted: Jun Fri 29, 2012 2:18 pm |
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Joined: Feb Thu 24, 2011 3:13 pm Posts: 155 Location: Ironwood, MI
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Tom,
Thank you for your very helpful information. EUREKA! The set is aligned and smiling now. I appreciated your help answering the question as well as the additional advice. Yes, I will adopt your idea. Several customers prefer to bring me their radios after they have removed them from the case, which sometimes has been problematic, but I try to be flexible and maintain the (now unfashionable, these days) "customer is always right" attitude.
This forum is a greatest and it's gentlemen like yourself that make it the most valuable website I visit.
Thanks.
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