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Rogers big 10-12 console - Printable Version

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Rogers big 10-12 console - Dan Walker - 05-10-2012

I just bought a Rogers 10-12 console for $25.00. It does not have a power supply or a clock. The cabinet is in good shape ,but that power supply is going to be a challenge. I have always wanted one of these and at that price I could not turn it down[Image: http://i318.photobucket.com/albums/mm405/danwalker45/ROGERS10-12001Medium.jpg][Image: http://i318.photobucket.com/albums/mm405/danwalker45/ROGERS10-12003Medium.jpg][Image: http://i318.photobucket.com/albums/mm405/danwalker45/ROGERS10-12016Medium.jpg]

RE: Rogers big 10-12 console - codefox1 - 05-10-2012

(05-10-2012, 10:29 PM)Dan Walker Wrote:  I just bought a Rogers 10-12 console for $25.00. It does not have a power supply or a clock. The cabinet is in good shape ,but that power supply is going to be a challenge. I have always wanted one of these and at that price I could not turn it down[Image: http://i318.photobucket.com/albums/mm405/danwalker45/ROGERS10-12001Medium.jpg][Image: http://i318.photobucket.com/albums/mm405/danwalker45/ROGERS10-12003Medium.jpg][Image: http://i318.photobucket.com/albums/mm405/danwalker45/ROGERS10-12016Medium.jpg]

Hang in there, looks like the Power supply and output amp chassis is missing. Shouldn't be too hard to find a sub, but you must be patient. Nice radio. We can help you get it going agian.

RE: Rogers big 10-12 console - Arran - 05-10-2012

I think maybe it's time for some detective work and start asking questions, I would bet that someone too it to use as a tube amp and that it still exists somewhere. Either that or the caps shorted and the transformer did a smoke show so they pulled the sub chassis for repairs. As for the clock I'm guessing that it may be an off the shelf electric unit adapted to use in the Rogers, it may be similar to the ones used by Motorolla and G.E in the U.S. G.E was the largest maker of electric clocks through the Telechron Company so if Rogers used a Telechron clock there could be a similar movement used in a desk clock. Needless to say for $25 you can afford to put some money out to get the proper parts.
Regards
Arran

RE: Rogers big 10-12 console - morzh - 05-11-2012

I llllove the way the speaker looks.
It's an animal!

RE: Rogers big 10-12 console - codefox1 - 05-11-2012

(05-11-2012, 12:10 PM)morzh Wrote:  I llllove the way the speaker looks.
It's an animal!

Agree with all, cabinet is in great shape. It would not be that hard to fabricate a power supply and audio output section if you fail to locate an original replacement. Might take you a year or two, so hope you are not in a rush.

RE: Rogers big 10-12 console - Arran - 05-12-2012

I performed a little research on this model, which believe it or not is posted on Nostalgia Air, a source that usaully has large gaps in it's collection of Canadian radio schematics. There is some good news, if you could call it that, the sub chassis only contains the power supply to the radio, the rectifier tube, the filter condensers, the power transformer, and a pair of filter chokes.

http://www.nostalgiaair.org/PagesByModel/191/M0029191.pdf

So my second guess was right, someone likely removed the power supply chassis because something went wrong with it, either that or it belonged to a Ham or some other experimenter that decided to use it to power something else. Building a power supply to produce the correct output voltages isn't a problem, but making an exact replica of the original would be a problem since horizontally mounted transformers of that size aren't exactly off the shelf items anymore, most are vertical mount now.
I don't know if it helps but apparently the same pair of chassis were used in three different models, according to the data sheet, a Rogers 10-12, a Rogers 10-120, and a Majestic "Normandie" (Canadian Majsetic of Course). It would be a difficult item to find but at least we know that the workings in this set was not a one off.
Regards
Arran

RE: Rogers big 10-12 console - TA Forbes - 05-12-2012

Wow! Very nice looking set!! I definitely would have done the same and bought it!

RE: Rogers big 10-12 console - morzh - 05-12-2012

I tell you that: for twenty-five quid one cannot go wrong with the cabinet this great. Totally worth the effort. I wouldn't think another time about it if I were the one to come across this set. And , the more the effort, the prouder you will feel, and the more experience you will gain: it is not every day that you get to build a tube power supply.
Worst case, if yo feel it is becoming too much, a solid state supply is a snap to create, though I probably wouldn't.

RE: Rogers big 10-12 console - Dan Walker - 05-13-2012

Thanks for the comments,, I am in the process of finding out exactly what I need in the way of a transformer and choke coils. I have put the word out that I am looking for a power supply.
Right after I got the radio home I noticed it was missing ,so I phoned the previous owner and he said the radio came from eastern Canada about 50 years ago and thats all that came with it. I have recapped the set and cleaned the chassis. Here is what it looks like now..

[Image: http://i318.photobucket.com/albums/mm405/danwalker45/chromechassis10-12.jpg][Image: http://i318.photobucket.com/albums/mm405/danwalker45/chromechassisrecapped.jpg]

RE: Rogers big 10-12 console - codefox1 - 05-14-2012

Beautiful restoration job. So far so good.

So far as the power supply, doesn't look that hard to make. It would be nice to know the original power transformer and choke specs, but at least you know you need 411 volts or so at the rectifier under load (which you can estimate), a 5 volt 3 amp winding for the rectifier, and you can add up the 6.3 requirement for the rest of the set to get the spec for that winding. You can pretty much always use transformers with higher current ratings than you need, but never use an underrated one. You have plenty of real estate in that cabinet, so size is not important.

You can also use slightly less inductance chokes and slightly larger value filter capacitors. Back in the day, filter capacitors were very expensive. Now chokes are expensive and capcitors are dirt cheap.

Do check out the field coil and output transformer windings though, to see if there are further complilcations to consider.

Download this free calculator if you want to roll your own supply. It's excellent, I've used it for many projects. Once you determine what you need you can post a WTB in the clasifieds on this forum. For that matter you can post a WTB for the whole power supply, somebody might have a spare.

http://www.duncanamps.com/psud2/index.html

Good Luck

RE: Rogers big 10-12 console - Dan Walker - 05-15-2012

To Cosefox1
,,I don't know that much about electronics,so what you are telling me is above my level of expertise.. I do my best to understand all of this and I have learned a lot. I have the schematics but they don't tell me how much voltage I need from the center tap of the transformer.. Is it 411 volts/ I am not sure what you mean by adding up the 6.3 requirement.. I do know that the other tubes take 6.3 volts for the heaters,and I presume that you add all of these tubes up and come up with some sort of amps for that part of the winding.. Am I correct? Thank you Dan

RE: Rogers big 10-12 console - codefox1 - 05-15-2012

Yes, you are doing great so far. I'll bet 600-650 CT VAC winding would be OK and a couple of 3-5 Hy chokes would do well. You can up the capacitor values a little and skimp on the chokes, but isolation of the stages must be respected.

I think this set would require no more than 150 ma requirements for B+. Yes, add up the filaments and pilot lamps to get the 6.3 requirements.

RE: Rogers big 10-12 console - radioswede - 01-19-2016

(05-13-2012, 05:21 PM)Dan Walker Wrote:  Thanks for the comments,, I am in the process of finding out exactly what I need in the way of a transformer and choke coils. I have put the word out that I am looking for a power supply.
  Right after I got the radio home I noticed it was missing ,so I phoned the previous owner and he said  the radio came from eastern Canada about  50  years ago and thats all that came with it. I have recapped the set and cleaned the chassis. Here is what it looks like now..

[Image: http://i318.photobucket.com/albums/mm405/danwalker45/chromechassis10-12.jpg][Image: http://i318.photobucket.com/albums/mm405/danwalker45/chromechassisrecapped.jpg]

Hi Dan,
I knew you had that 10-12 but wasn't aware it was missing pieces.  Being here in Phoenix there is not a wealth of Rogers and DeForest rigs to scout out for parts.  Dan, my email is radioswede@gmail.com .  Drop a note please.  Thanks, Wayne