10-18-2024, 01:30 PM
Well it looks like I jumped the gun. Brought it up slowly on a variac and at about 30V it was drawing .24A and at 60V it was drawing about half an amp. Shut it off and took a closer look at the speaker/OT, supposedly from another 89. Turns out it's stamped on the OT 2580-P. Not sure about the "P" designation but according to docs on this site it should work with a 42 output tube so that should be good. This is my first field coil/OT so I'm not sure the best way to test it. DC resistance readings (disconnected from the radio) are as follows:
Green — White (OT primary) 460Ω
Green — Green & White (OT Primary and field coil) 1.6KΩ
White — Green & White (field coil) 1.13KΩ
That sounds about right.
I'm not sure what the two flat wires coming out of the bottom of the FC are, but I think the two at the bottom of the OT are the secondary. Unfortunately both pairs seem to be shorted, but again I'm not sure exactly what readings to expect on the secondaries. I think the schematic shows the speaker connected to the OT secondary only, it looks like this speaker shares connections with the FC. Maybe this is from another 89 model?
The speaker itself moves well without binding and pops and moves a little the way I expect with a AA battery across the terminals. I've attached pictures below. Any help would be appreciated! Also, I haven't rewound the RF coild primary yet, hopefully that doesn't play a part here... Thanks!
Green — White (OT primary) 460Ω
Green — Green & White (OT Primary and field coil) 1.6KΩ
White — Green & White (field coil) 1.13KΩ
That sounds about right.
I'm not sure what the two flat wires coming out of the bottom of the FC are, but I think the two at the bottom of the OT are the secondary. Unfortunately both pairs seem to be shorted, but again I'm not sure exactly what readings to expect on the secondaries. I think the schematic shows the speaker connected to the OT secondary only, it looks like this speaker shares connections with the FC. Maybe this is from another 89 model?
The speaker itself moves well without binding and pops and moves a little the way I expect with a AA battery across the terminals. I've attached pictures below. Any help would be appreciated! Also, I haven't rewound the RF coild primary yet, hopefully that doesn't play a part here... Thanks!