Hello.

I am restoring a ATK model 37. Now i am working whith the power pack. I need know the voltage (In A.C.)that have to be in the rectifier 80 in this radio, in other words, the voltage in the secondary of the transformer.

Thanks.
Jose A. Gonzalez
c3019gr@copitima.com

Jose, I have an A-K 37 that is working well. I pulled the 80 rectifier tube, and measured 330V across the power xfmr secondary (socket locations 3 and 4). The line voltage was 120.7V. Obviously, the xfmr secondary voltage would be lower if the 80 were installed and the radio on.

How are your B+ voltates at the various tubes?

Hello Doug.

Thanks for this information. A question. This voltage, 330V, it is between terminal 3 and terminal 4 (Plate to filament) or between terminal 2 and terminal 3 (plate to plate)?. In the primary, we have to put 110V?

I do not know B+ voltates in some tubes because i am restoring the radion and the radion do not work still.

Jose A. Gonzalez

:Jose, I have an A-K 37 that is working well. I pulled the 80 rectifier tube, and measured 330V across the power xfmr secondary (socket locations 3 and 4). The line voltage was 120.7V. Obviously, the xfmr secondary voltage would be lower if the 80 were installed and the radio on.
:
:How are your B+ voltates at the various tubes?

I'm sorry, I misspoke. The 330V is between pin sockets 2 and 3. That would be across the high-voltage secondary.

Pins 1 and 4 are for the filament.

Thanks Doug.

:I'm sorry, I misspoke. The 330V is between pin sockets 2 and 3. That would be across the high-voltage secondary.
:
:Pins 1 and 4 are for the filament.

Jose, I measured the voltage again, and got 420V a.c. across the xfmr secondary with the rectifier pulled. Not sure how I got the other reading.

Also -- yes, the power xfmr primary must be supplied by a nominal 110-120V, unless, by chance, you have a model designed for 220V, which I sort of doubt.

Unlike most A-K a.c. sets, the nameplate on my Model 37 doesn't list the voltage. But here are the xfmr d.c. resistances that I measured on my set: primary 19 ohms, hi-voltage secondary, 0.7K ohms. If your winding resistances are in this same ballpark, your set must me designed for 110V.

Is your power 50Hz or 60Hz? If it's 50HKz, and your xfmr is designed for 60Hz, it'll run a little hot.

Hello Doug.

Thanks to say this new read and the resistance in thwe secondary. My power pack is broken and i need those values to can rapair.

The radio will run at 50 HZ
Now i will count the copper in the secondary and primary to make the transform.

Thanks.
Jose Antonio.

And pardon for my english, it is no very good.

:Jose, I measured the voltage again, and got 420V a.c. across the xfmr secondary with the rectifier pulled. Not sure how I got the other reading.
:
:Also -- yes, the power xfmr primary must be supplied by a nominal 110-120V, unless, by chance, you have a model designed for 220V, which I sort of doubt.
:
:Unlike most A-K a.c. sets, the nameplate on my Model 37 doesn't list the voltage. But here are the xfmr d.c. resistances that I measured on my set: primary 19 ohms, hi-voltage secondary, 0.7K ohms. If your winding resistances are in this same ballpark, your set must me designed for 110V.
:
:Is your power 50Hz or 60Hz? If it's 50HKz, and your xfmr is designed for 60Hz, it'll run a little hot.

Hello Doug.

Can you say me the serial number to your ATK37?
Thanks
Jose A. Gonzalez

:Jose, I measured the voltage again, and got 420V a.c. across the xfmr secondary with the rectifier pulled. Not sure how I got the other reading.
:
:Also -- yes, the power xfmr primary must be supplied by a nominal 110-120V, unless, by chance, you have a model designed for 220V, which I sort of doubt.
:
:Unlike most A-K a.c. sets, the nameplate on my Model 37 doesn't list the voltage. But here are the xfmr d.c. resistances that I measured on my set: primary 19 ohms, hi-voltage secondary, 0.7K ohms. If your winding resistances are in this same ballpark, your set must me designed for 110V.
:
:Is your power 50Hz or 60Hz? If it's 50HKz, and your xfmr is designed for 60Hz, it'll run a little hot.

Jose, while getting the serial no., I re-measured the secondary xfmr voltage: 662V! I have trouble making a good connection with my voltmeter probes through the 80 socket. I think this reading is correct.

My serial no. is 1330368, which I think makes it an "early" model.

Thanks Doug.
Now i have the trafo to repair.

Thanks.
Jose A. Gonzalez

:Jose, while getting the serial no., I re-measured the secondary xfmr voltage: 662V! I have trouble making a good connection with my voltmeter probes through the 80 socket. I think this reading is correct.
:
:My serial no. is 1330368, which I think makes it an "early" model.