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 Post subject: Trying to identify this Regal Clock Radio
PostPosted: Sep Wed 22, 2021 9:31 pm 
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Location: Chesapeake, VA
I've looked high and low and can't identify a model number and/or a schematic for the clock radio below. Can anyone help me? Looks like the model number would be C-255, but I can't find anything.

Thanks for the help.


Attachments:
Regal 1.jpg
Regal 1.jpg [ 723.02 KiB | Viewed 884 times ]
Regal 2.jpg
Regal 2.jpg [ 605.04 KiB | Viewed 884 times ]
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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 1:53 am 
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Location: Mountains of Mourne. Ireland.
Regal Electronics Corp. tube complements (line-ups) can be seen here…
https://www.grillecloth.com/sylvania/tu ... ubmit&db=5

Schematics: http://www.nostalgiaair.org/Resources/350/T0000350.htm

Greg.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 4:23 am 
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Location: Chesapeake, VA
Thanks Greg, but no joy. I like that grillecloth.com site but it did not have this radio listed. I opened up the back and it is the 12BE6, 12BA6, 12AT6, 50C5, and 35W4 tubes.

No joy on the Nostalgiaair site either.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 4:44 am 
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Why do you need a schematic? Is there some part(s) missing?


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 12:48 pm 
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For a schematic, look through one of the Beitman's manuals from the early 1950s. Most of the miniature tube AA5 radio circuits are identical.

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 4:22 pm 
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This jewel may be close http://www.nostalgiaair.org/Resources/744/M0009744.htm .There were a of clock radios, in that basic shape

sold. I have a Lang, with the same chassis, has a different cabinet. good luck !

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 5:32 pm 
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This set is one of those less common brands that not a lot of information exists about.

As others have noted, there is very little reason to ever need an exact schematic for any AA5 set since they are so generic.

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Thu 23, 2021 7:28 pm 
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Location: Chesapeake, VA
Wow glassdave that looks almost identical. I found this one: http://www.radiomuseum.org/r/regal_c_52 ... radio.html to use as my basis, and the schematics are almost identical.

Now I've got three clock radios to conquer! Dumont 1120, Traler 55C44, and Regal XX.

Thanks for the help guys/gals.


Attachments:
DUMONT 2.jpg
DUMONT 2.jpg [ 106.69 KiB | Viewed 727 times ]
IMG_2228.JPG
IMG_2228.JPG [ 2.83 MiB | Viewed 727 times ]
Regal 1.jpg
Regal 1.jpg [ 723.02 KiB | Viewed 727 times ]
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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Sat 25, 2021 3:53 pm 
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Regal C-255 seems reasonable.
Could have been built by the Jewel company. At that time they built clock radios to order for others name brands.
Keep searching for the identical cabinet with a different name.
This pic shows your missing knob. Cheers.


Attachments:
Regaloop C-255.jpg
Regaloop C-255.jpg [ 1.01 MiB | Viewed 668 times ]

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Sep Sat 25, 2021 8:28 pm 
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Thanks WestcoastJohn. I did see that picture with the knob. Now the trick is to find that knob and the clock knob for the Dumont 1120.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Thu 25, 2021 6:01 am 
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Well I started my restoration of my Regal C-255 radio. Though I never found a schematic for it, I thought I had found two schematics that would be very close and with some adjustments, that shouldn't be a problem. Boy was I wrong. For starters, there is only one IF transformer. I've been looking but can't seem to find a 5 tube schematic with only one IF can. In addition, most of the components underneath the chassis don't correlate to either schematic I was looking at.

Here's the underside of the chassis and my attempt at making an AS-IS schematic.
Attachment:
Component ID underside of chassis Regal C-255.png
Component ID underside of chassis Regal C-255.png [ 1.91 MiB | Viewed 381 times ]


As you see, there are a few components that I'm not sure what they are (??) and have made my best guess. I have measured the resistors and they are almost all way out of spec and will have to be replaced. Obviously I have not done anything with the capacitors yet, just trying to get them identified. Can anyone id mica capacitor and is that a bubble bee capacitor or a 3.8K resistor (it measures 2.8K ohms). That little green thing (??) at the left side by the RF coil measures 21.4K ohms

There is a couplate PC150 installed in this one as well. I actually found a pdf that shows centralab printed circuits schematics on it so if I have replace with a discreet component rebuild, I won't be guessing.

I'm not sure what my next step should be. Normally I would replace the capacitors, probably leave the mica cap, then check wires for shorts and try to fire it up with the iso transformer and variac.

The top side of the chassis has a lot of clean up work to do and the case does have a crack on the bottom that will have to fixed, so I've got plenty to do while I try figure out the circuitry.

Any suggestions would be appreciated.


Attachments:
regal C-257-title PhotoFact_Page_2.jpg
regal C-257-title PhotoFact_Page_2.jpg [ 349.92 KiB | Viewed 381 times ]
jewel_920_title PhotoFact_Page_2.jpg
jewel_920_title PhotoFact_Page_2.jpg [ 387.9 KiB | Viewed 381 times ]
REGAL C-255 AS-IS SCHEMATIC.JPG
REGAL C-255 AS-IS SCHEMATIC.JPG [ 365.64 KiB | Viewed 381 times ]
Regal C-255  16 chassis top with tubes.JPG
Regal C-255 16 chassis top with tubes.JPG [ 806.75 KiB | Viewed 381 times ]
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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Thu 25, 2021 3:54 pm 
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The larger striped thing is a resistor. Just use a 5 watt unit to replace it, if you replace it.

The green item is not clearly visible. The foil and paper capacitors are all marked, so just change them, and replace the filter capacitors.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Thu 25, 2021 4:41 pm 
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Location: Mountains of Mourne. Ireland.
A schematic for an AA5 set with one I.F. Transformer was posted here by Dave…
viewtopic.php?p=548786#p548786

A neat three-page article with the chronological listing of the "All-American Five" tube line-up
can be seen on page 69 of Popular Electronics, March 1959
https://worldradiohistory.com/Archive-P ... 959-03.pdf

------------

Internal schematics and circuit placement for Centralab's Audet Couplates PC-150 and PC-151 can be seen here...
http://pacifictv.ca/schematics/centralabcouplates.pdf

Rebuilding Couplates...
viewtopic.php?p=3260086#p3260086

Couplate was a Centralab brand name aka P.E.C. (printed electronic circuit).

------------

Be they Mica or paper capacitors…
It is best not to rotate Domino capacitors on their axis as you run a good chance of compromising their integrity.
Unsolder or use a cheap dental mirror from eBay.

Micamold is a brand name, and... some domino components are even Resistors.

Tables, calculation and fourth color voltages...
viewtopic.php?p=2413184#p2413184


Greg.
oh… "Bumblebees" are different puppies.
viewtopic.php?p=3173979#p3173979


Last edited by egg on Nov Thu 25, 2021 4:46 pm, edited 1 time in total.

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Thu 25, 2021 4:46 pm 
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Location: Clearwater, KS
Looks like you're missing an IF can.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Thu 25, 2021 11:18 pm 
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The "missing IF can" could very well be a production change. They may have just fed the output of the IF amp right into the detector 12AT6 tube diode section. Less selectivity, but saved a bit in production costs. We can make alot of assumptions about the thing due to the commonality. For instance if you are fastidius replacing the paper/electrolytic caps and just replacing resistors that are damaged or above marked values by more than maybe 20 percent, it ought to function, given a complement of functioning tubes installed. IF it does function then you can go ahead and peak the single IF transformer and what little bit of enhancement you might achieve tweeking the tuning cap trimmers to optimum. There is still the question mark left of maybe a bad IF can or bad tube or tuning cap with rubbing plates, or unusual bad mica cap, or defective speaker that buzzes or output transformer. But there is a good chance that the basic initial step of a recap may restore it to some function with no disaster. Having the schematic for it would be the easiest rescue if there was some sort of complicated issue with it, but if it has not been badly abused or monkeyed with by a knucklhead pro or amateur repairman, you can get it going with the basics. BTW the big resistor appears brown gray red, or 1.8k per the stripes.

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Fri 26, 2021 7:19 am 
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Joined: Aug Tue 10, 2021 9:49 pm
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Location: Chesapeake, VA
Thanks Greg and Wazz! Great to hear that the 5 tube and 1 IF can is a known design technique. I loved that article in Popular Electronic...... I love that site and have read many past issues.

I've already replaced two couplates by constructing with discreet components. Now that I've found these couplate designs, I'm more confident with it. The last on I did on a Dumont 1150, I had ample area to install, just had to have long leads.
Attachment:
Dumont 1150 couplet rebuilt 3.JPG
Dumont 1150 couplet rebuilt 3.JPG [ 2.08 MiB | Viewed 261 times ]


Thanks for the tip on NOT rotating the Domino capacitors.

Wazz, Upon further review, I believe you are correct in that the resistor is brown, gray, red 1.8K. It measures 2.8K so it's going away and be replaced with a 5 watt 1.8K resistor. Like I mentioned before most of the resistors are way out of tolerance.

I still can't find a schematic for this unit........ #$!$% :evil:

Several of the wires are in bad shape and will have to be replaced.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Mon 29, 2021 8:40 pm 
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Joined: Aug Tue 10, 2021 9:49 pm
Posts: 63
Location: Chesapeake, VA
Attachment:
IMG_2767.JPG
IMG_2767.JPG [ 4.47 MiB | Viewed 172 times ]
Well I got all the components underneath replaced. All the capacitors except the Mica Cap was replaced and all the resistors with the exception of a 100K ohm and the 56 ohm resistor were replaced.

I measured the resistances of the PC-150 couplate and all were out of spec, so I rebuilt and replaced it.
Attachment:
IMG_2796.JPG
IMG_2796.JPG [ 2.69 MiB | Viewed 172 times ]


So it was almost time to give it a test. I measured all the tube resistances between pins 3 and 4 and all were good. BUT when I measured the resistance across the secondary to the audio transformer, I got a short. $!@% How do I identify this thing and replace it?? Can I test the circuit without the audio transformer??
Attachment:
IMG_2802.JPG
IMG_2802.JPG [ 3.27 MiB | Viewed 172 times ]


I don't really want to attack cleaning the chassis and repairing the crack in the case if this unit turns out to be unrepairable.


Last edited by jseabee on Nov Mon 29, 2021 8:59 pm, edited 1 time in total.

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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Mon 29, 2021 8:49 pm 
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Location: Mission Viejo, southern California
Sorry to ask, but is the speaker connected? It still should not be zero. Small audio transfomers such as that are readily available, new, used, and salvaged from other things. You know what tube drives it and the voice coil DC resistance (multiply by 1.25 to get approximate impedance), so have all of the information needed to select a replacement. https://www.radioremembered.org/outimp. ... 0available


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Mon 29, 2021 9:02 pm 
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Joined: Aug Tue 10, 2021 9:49 pm
Posts: 63
Location: Chesapeake, VA
Thanks Stephen. I did make one edit, it's the secondary of the transformer feeding the speaker. No I disconnected the speaker for ease of work on the unit. I believe a 50C5 is the audio tube. I'll read the article tonight when I get home.


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 Post subject: Re: Trying to identify this Regal Clock Radio
PostPosted: Nov Tue 30, 2021 4:28 am 
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Location: Vancouver Island, Canada
Right, it's just a clock radio, any AA5 chassis from the 1950's will have a compatible output transformer.
If you get stumped, place a friendly WTB (want to buy) ad in the Classifieds here.
The short might be external, so disconnect the wires from that terminal strip and check again.

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Burl Ives, RIP, oldtimer.
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