If you wish, as a help to us, list the tubes of your radio. If you know the field coil resistance (if the speaker has a field coil), that is a help as well. Any other information, of course, is a help. Someone should be able to find information on that model number, though.
Thomas
If your set has only 1 5Y3 tube, you will only need about a 2 or 3 ampere 5.0 volt winding>>the winding that powers the 5Y3 filament. If your set has 2 5Y3 tubes like you say (this does sound strange...perhaps just a typo), you'll need more like a 4 or 5 ampere winding. The 6.3 volt winding (the winding that powers all the other tube filaments) can be from 3 amperes on up. Check to see if the original winding has a center tap. You will probably want a new transformer with a center tap on this winding (6.3 volts) if the old one has one. The center tap is tied to the chassis for shielding and hum purposes.
As for your HV winding, I will not know a rough idea until you tell me your electrolytic voltage ratings. Generally, with a single ended 6F6 output, the HV is from 250 to 375 volts, depending on what kind of power the manufacturer wanted, and of course, what your output transformer and other components are capable of handling. If your speaker has a field coil (where the magnet usually goes), the resistance (found with an ohm meter--buy at Radio Shack) is helpful to be known.
If noone on here can find you a schematic, www.tubesandmore.com will have one for you for about $10.00. They will have your transformer, too. I recommend purchasing a schematic. Call them up and ask them if they carry your model number. They are also called Antique Electronics Supply. tubesandmore.com is just their web address.
What is wrong with the original transformer? I assume it is blown, and either overheats or is completely dead.
Let us know all the details requested above.
Thomas
: The tubes are as follows 5y3gt, 6f6, 6f5, 6k7gt, 6k7, 6a8, 5y3gt. Speaker a Jensen G70 R B 1948. Thats all I know about the speaker no other listing. Transfomer has a number on it that says 4881. I KNOW about electronics! So bear with me. Am hoping to get it running again!
Take a look at Rider's page 15-1 thru -3 for Western Air Patrol model 76. Same tube line-up as your 276, except for a 6H6 instead of one of your 5Y3's. It's very possible that someone used a 5Y3 just to fill an empty socket.
By the way, the original Rider's page is not much clearer than the Nostalgia page--good luck reading any of the parts list. If you are really stuck on a part listing, let me know, I'll get out a magnifying glass to get a better look--old eyes need some help.
Unfortunately, there are no voltage's listed for the power transformer, but the electrolytic filter caps are listed as (2) 8mfd. at 500 volts. There is a center tap on the 6 volt filament tap, which feeds 2 "pilot lamps".
Hope this helps,
Meade
:The thing has 2 5Y3 tubes? WOW! That's unusual. What are the voltage ratings of the electrolytic condensers? These will be cans or boxes of some sort (aluminum, paper, etc., of large dimentions), with MFD ratings. Such ratings may be 16 MFD, 20 MFD, 50 MFD, 40 MFD, etc. The working voltage rating of these condensers will tell roughly what voltage the high voltage should be. Don't pay attention to the smaller units--.01 MFD, .05 MFD. These will all be rated at either 400 or 600 WVDC (working volts direct current), and this is well above what your power supply will most likely be.
:
:If your set has only 1 5Y3 tube, you will only need about a 2 or 3 ampere 5.0 volt winding>>the winding that powers the 5Y3 filament. If your set has 2 5Y3 tubes like you say (this does sound strange...perhaps just a typo), you'll need more like a 4 or 5 ampere winding. The 6.3 volt winding (the winding that powers all the other tube filaments) can be from 3 amperes on up. Check to see if the original winding has a center tap. You will probably want a new transformer with a center tap on this winding (6.3 volts) if the old one has one. The center tap is tied to the chassis for shielding and hum purposes.
:
:As for your HV winding, I will not know a rough idea until you tell me your electrolytic voltage ratings. Generally, with a single ended 6F6 output, the HV is from 250 to 375 volts, depending on what kind of power the manufacturer wanted, and of course, what your output transformer and other components are capable of handling. If your speaker has a field coil (where the magnet usually goes), the resistance (found with an ohm meter--buy at Radio Shack) is helpful to be known.
:
:If noone on here can find you a schematic, www.tubesandmore.com will have one for you for about $10.00. They will have your transformer, too. I recommend purchasing a schematic. Call them up and ask them if they carry your model number. They are also called Antique Electronics Supply. tubesandmore.com is just their web address.
:
:What is wrong with the original transformer? I assume it is blown, and either overheats or is completely dead.
:
:Let us know all the details requested above.
:
:Thomas
:
:: The tubes are as follows 5y3gt, 6f6, 6f5, 6k7gt, 6k7, 6a8, 5y3gt. Speaker a Jensen G70 R B 1948. Thats all I know about the speaker no other listing. Transfomer has a number on it that says 4881. I KNOW about electronics! So bear with me. Am hoping to get it running again!
Thanks for the Info you guys I will try all this stuff and go from here. I have a place that sells LOTS and Lots of tubes and Transformers maybe they can help me! Cascade Surplus in Portland Oregon. I am hoping to get it going!! If I need more I will let ya know you have been a BIG help!!!