I'm looking for the schematics of a Centrum 850V. it's a 1940/50 Swedish radio and it's missing a tube. Can someone help me?
:I'm looking for the schematics of a Centrum 850V. it's a 1940/50 Swedish radio and it's missing a tube. Can someone help me?
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::I'm looking for the schematics of a Centrum 850V. it's a 1940/50 Swedish radio and it's missing a tube. Can someone help me?
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: : : :  : : : : : : : :Sr Miguel . . . . : : :No schema . . . .and I can only tell you of two tubes used in the unit. : : : :The set uses a 7 pin miniature EZ90 or 6X4 tube for its rectifier tube. : : :Being physically placed near the sets power transformer. : : : :  : : : : :And the set uses a larger . . .octal (8 pin . .IF all of its pins are included) for the sets audio output tube. : : : : : : : : : : : : : : :73's de Edd : : : : : :A couple ounces of encouragement sure feels good in the middle of a ten pound day. : : : : : :  : : : |
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Thanks Mr Edd,
The tube that's missing is the rectifier but on the display the base is similar to the one of the 6V6G, and that is my doubt... :(
The remaining tube are miniatures (6J6, 6BA6, 6AT6).
My doubt is that if an equivalent with a diferent base won't burn the remaing tubes??
This layout that i've got fits almost perfectly on the 850V but is of diferent radio (857 RTV), and i'm afraid of burning the rest of the tubes...
Thanks,
Miguel Cardoso
:::I'm looking for the schematics of a Centrum 850V. it's a 1940/50 Swedish radio and it's missing a tube. Can someone help me?
:::
::
::
:: :: :: :: :: :: :: :: :: :: :: ::Sr Miguel . . . . :: :: ::No schema . . . .and I can only tell you of two tubes used in the unit. :: :: :: ::The set uses a 7 pin miniature EZ90 or 6X4 tube for its rectifier tube. :: :: ::Being physically placed near the sets power transformer. :: :: :: :: :: :: :: :: ::And the set uses a larger . . .octal (8 pin . .IF all of its pins are included) for the sets audio output tube. :: :: :: :: :: :: :: :: :: :: :: :: :: :: ::73's de Edd :: :: :: :: :: ::A couple ounces of encouragement sure feels good in the middle of a ten pound day. :: :: :: :: :: :: :: :: :: |
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:Thanks Mr Edd,
:
:The tube that's missing is the rectifier but on the display the base is similar to the one of the 6V6G, and that is my doubt... :(
:The remaining tube are miniatures (6J6, 6BA6, 6AT6).
:My doubt is that if an equivalent with a diferent base won't burn the remaing tubes??
:This layout that i've got fits almost perfectly on the 850V but is of diferent radio (857 RTV), and i'm afraid of burning the rest of the tubes...
:
:Thanks,
:Miguel Cardoso
:
(BTW . . . the 5VAC winding is dedicted solely to powering up that 5Y3 and is isolated also.)
Sr Miguel . . . .
Hmmmmmm . . . . must have been an early chassis run, which would have used the 8 pin octal such as the 6V6 is having.
But the rectifier tube would have been a 5Y3GT.
Confirm that by powering up the set and measure across pins 2 and 8 (viewed from bottom chassis view . . . . .or inverted in your mind if top- chassis) for the presence of approximately 5Vac, now I say APPROXIMATELY just by virtue of the absence of 5Y3 current pull / loading factor.
We certainly don't expect to be finding up in the 6.3 Vac range, which is which AC level the other tubes are being fed, from another, separate and isolated filament supply winding.
Then further check the pins 4 and 6 to see that each one of them is going to an outer winding of the high voltage secondary winding of the power transformer.
Then, with a high probability of the center tap of that high voltage winding is going to ground, since it is being in the 40-50's design scheme, and not back in the 30's.
Refer to the 5Y3 utilization in this Schema of a regulated power supply design.
THUMBNAIL:
73's de Edd
People who think they know everything, certainly upset those of us who do.