ovrphil
Well-known member
verrrrrrrrry interestingk, but .....stupid?
Tappan wall ovens - Bloomfield Hills MI
- Thread starter carlvs
- Start date
Help Support :
At least it's not on a scrap metal ship to China.
Anthony, please be careful when working on that microwave. I can think of about 6 ways it will try to kill a person. Even if it was "working when removed" that power supply section should be rebuilt before putting back into service. Leakage checked around the door and cutout switches cleaned and adjusted. The caps should be reformed and insulation tested in the HV section. Unlike an old TV, there is no current limiting should you get on the HV.
Anthony, please be careful when working on that microwave. I can think of about 6 ways it will try to kill a person. Even if it was "working when removed" that power supply section should be rebuilt before putting back into service. Leakage checked around the door and cutout switches cleaned and adjusted. The caps should be reformed and insulation tested in the HV section. Unlike an old TV, there is no current limiting should you get on the HV.
At least it's not on a scrap metal ship to China.
Yes I'm am cerantly rebuilding the power sappy and recap. Two of the 866A reflector tubes are bad. And the switches have been replaced at some point of time by a hack! Along with the timers it made me shake my head. It has a build date of March 7 1957.
Yes I'm am cerantly rebuilding the power sappy and recap. Two of the 866A reflector tubes are bad. And the switches have been replaced at some point of time by a hack! Along with the timers it made me shake my head. It has a build date of March 7 1957.
ovrphil
Well-known member
some before/after or both photos during restoration...
Anthony - at the least, post some pics of what you've done either during, after or both processes of restoration.
If not, maybe you could post some pics after it's completed and then installed. I'm not a licensed electrician, but would be interested in seeing what's inside before and after.
Otherwise, maybe a shot of it installed in your kitchen?
good luck
Phil
Anthony - at the least, post some pics of what you've done either during, after or both processes of restoration.
If not, maybe you could post some pics after it's completed and then installed. I'm not a licensed electrician, but would be interested in seeing what's inside before and after.
Otherwise, maybe a shot of it installed in your kitchen?
good luck
Phil
866 rectifier tubes-mercury vapor at that--never thought those would be used in a microwave oven-but makes sense-the earliest ones made before solid state rectifiers became common.The 866 tubes are still available for a price-ham radio suppliers comes to mind-and suppliers of industrial/transmitting tubes.Remember the 866 tubes in the bias supplies-3 phase at that in older RCA TV transmitters.They are also used in the RCA low level stages.and there are solid state plug in replacements if you don't want to pay the price for actual "tubes".
I have tubes on the way and would like to keep the tubes seeing as I have several tube amps/radios a have built. When I was young my grandpa and I would work on his ham radio and other stuff. He was a radio repairman on a ship in ww2. After he got back he set up almost all of the radio equipment in the towers for the DNR here in northern MI.
GREAT!!Glad you were able to get the 866's.You can preserve the "charactor" of your oven.LOVE the glow of the MV rectifiers!!You can TELL that they are working!!
1958 Tappan Electronic Oven
Cool oven Anthony, I have a 1958 Westinghouse oven that is built by Tappan and other than a few small styling details should be exactly the same oven. The one I have I have not tried to power up yet and will not do so until I check it over pretty carefully, I will be very interested to hear how yours checks out. Pictures are always great also, if you did through the archives you can probably find pictures of the two I have, both are WH, the other is a 1962 model that is very different in construction, but looks about the same on the outside.
John L.
Cool oven Anthony, I have a 1958 Westinghouse oven that is built by Tappan and other than a few small styling details should be exactly the same oven. The one I have I have not tried to power up yet and will not do so until I check it over pretty carefully, I will be very interested to hear how yours checks out. Pictures are always great also, if you did through the archives you can probably find pictures of the two I have, both are WH, the other is a 1962 model that is very different in construction, but looks about the same on the outside.
John L.
kb0nes
Well-known member
Anthony, Excellent photos! Great to see the power supply and the magnetron of this old unit.
Looks like one of your 866 rectifier tubes is a bit low on Mercury... You can still find them though, some of the old boat-anchor radio folks have horded them. In today's world I'd be tempted to to replace them with silicon rectifiers. They don't have the nostalgia of the tubes but if you plan to use the oven maybe it would be for the best.
Do you have a schematic of the microwave and power supply?
As always be wary of this monster, there are some scary/lethal voltages in there!
Looks like one of your 866 rectifier tubes is a bit low on Mercury... You can still find them though, some of the old boat-anchor radio folks have horded them. In today's world I'd be tempted to to replace them with silicon rectifiers. They don't have the nostalgia of the tubes but if you plan to use the oven maybe it would be for the best.
Do you have a schematic of the microwave and power supply?
As always be wary of this monster, there are some scary/lethal voltages in there!
1958 Tappan Electronic Oven
Very cool it looks exactly like the one we have and the interior looks to be in great shape.
I am guessing that these early Tappan MWs put out around 1000 watts of cooking power from reading some of the recipes that come with the oven. If this is true these ovens probably use 3 to 4 times as much power as new MW ovens, but it is still fun to have one of the first home MWs made.
Hope you can post a video of you cooking something in it.
Very cool it looks exactly like the one we have and the interior looks to be in great shape.
I am guessing that these early Tappan MWs put out around 1000 watts of cooking power from reading some of the recipes that come with the oven. If this is true these ovens probably use 3 to 4 times as much power as new MW ovens, but it is still fun to have one of the first home MWs made.
Hope you can post a video of you cooking something in it.
ovrphil
Well-known member
Good photos, thanks Anthony! The tubes were "kaput" a long time ago, I bet - I wonder how long that unit sat, un-repaired? The cost to repair would be downpayment on a car, lol!
Keep breathing. We need to see the rest of the project, when done.
Keep breathing. We need to see the rest of the project, when done.
Bridge rectifier no less-COOL!!Ovens made today have voltage doubler supplies.Stick with the orig tube type if you can-the mercury tubes preserve the charactor of this machine.You may want to replace the selenium diodes,though-age causes these to go bad.The supply in that thing makes me think of the power supplies in some older "Ham" radio linear RF power amps.Like the vacuum time delay relay in there-see those in some broadcast transmitters.
Wondering
Hey, am I the only one wondering why the seller told cadman the ovens were thrown out by contractors, when in reality they were sold to mopar65? Did the seller make up that story to reject an out-of-town buyer in favor of a local one?
Anyway, I'm glad the ovens weren't scrapped, and are being repaired.
[this post was last edited: 2/14/2014-04:08]
Hey, am I the only one wondering why the seller told cadman the ovens were thrown out by contractors, when in reality they were sold to mopar65? Did the seller make up that story to reject an out-of-town buyer in favor of a local one?
Anyway, I'm glad the ovens weren't scrapped, and are being repaired.
[this post was last edited: 2/14/2014-04:08]
ovrphil
Well-known member
If they were all copper, they'd be long gone - shame the contractors didn't know these are not your every day used ovens
xpanam
Well-known member
WOW!!!Anthony!!!! Glad you were able to save these, and thanks for the pictures. Always wondered about the technology of these new ovens. When you get her up and running, can you surprise us with a video of it running? I am curious about how it compares to todays microwaves, like how long dose it take to boil a cup of water? Thanks Anthony. And please be careful HIGH VOLTAGE LOL! Rob.
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