PALOMAR 300A TRANSFORMER RF DECK SWAPPING

[Sonar]

Can anyone tell me by viewing the photos of the first RF deck if it's Transformer work with the photo of the second rf deck? They're both white face 300a's, but I know not all Transformers are interchangeable with different decks of the same model number. Thanks. 73 s

 

[nomadradio]

It's the stuff under the chassis deck that indicates which transformer an RF deck will need.

The pc board in the center underneath may have a rectangular epoxy block rectifier called a bridge. That one requires the 560-Volt version of the transformer.

If the center pc board has four individual 2-legged rectifier diodes, this is a full-wave doubler circuit. It requires the lower 280-Volt transformer version.

But the transformers have absolutely *NO* markings that indicate which one you have.

But pics of the RF deck's top side don't directly reveal this power supply detail.

And as you can see, the "white" face doesn't even tell you which relay setup is inside.

73

 

[Sonar]

It's the stuff under the chassis deck that indicates which transformer an RF deck will need.

The pc board in the center underneath may have a rectangular epoxy block rectifier called a bridge. That one requires the 560-Volt version of the transformer.

If the center pc board has four individual 2-legged rectifier diodes, this is a full-wave doubler circuit. It requires the lower 280-Volt transformer version.

But the transformers have absolutely *NO* markings that indicate which one you have.

But pics of the RF deck's top side don't directly reveal this power supply detail.

And as you can see, the "white" face doesn't even tell you which relay setup is inside.

73

I thought that might be the case. Unfortunately I don't have photos of the underside of my amplifier. I should have opened it and taking those photos. The picture of the other amp I do have a photo of the underside. Unfortunately it's a little too late. I saw the RF deck on fleabay. It looked nice and clean, and although we all know that doesn't necessarily mean much, the price was right. I also believe it was a naked offer auction besides the listed price which in my opinion was just a bit higher than it should have been. I would have made an offer had I had the proper photos of my amplifier. You snooze you lose. That doesn't mean the information you offered was wasted. I will make sure to take some photos of the underside of my 300 a in the case that type of no Transformer RF deck deal comes along again. Especially if it looked as nice as the one that was scooped up very quickly. Thanks again nomadd. 73's