Hello All. I’m new to both the phorum and to tube radio restoration. I have a Philco 48 460 Hippo that is in decent working condition except the speaker is damaged. Am hope to replace it with NOS if that is possible. Does anyone have knowledge of what replacement part # would be correct for this task. I’ve found this item on EBay and wonder if it would be appropriate??
https://rover.ebay.com/rover/0/0/0?mpre=...2937527006
I appreciate any and all info anyone can share!
Thanks
Welcome!
You can find the Philco service bulletin here on AudioPhool:
http://audiophool.com/Philco.html
There are also Riders service bulletins available from NostalgiaAir:
http://www.nostalgiaair.org/Resources/634/M0013634.htm
The Riders bulletins are OK but often not as detailed. Also the scan quality is a bit better on AudioPhool but you'll need to convert from DJVU format to PDF for viewing.
I've attached the PDF for the 48-460.
According to the parts list the original speaker is part 36-1615.
Have you measured the original? If it's a physical match then I believe it should work fine since it's a permanent magnet speaker.
Welcome to the Phorum!
Thank you Nathan! The measurements of the speaker are both 4 x 6, will have to give it a try and buy it to see if its a good fit otherwise. My inclination was the same as yours though being they are both PM speakers. Thank you again for the information, the links, attachments, and the really quick response!!
Okay...have one more question that again is a rookie wondering. As I am looking more closely at the chassis and wiring, I’m noticing several wires are disintegrating from their age. If I were to replace these, where would you guys recommend purchasing appropriate wire...and is soldering an appropriate process for the replacement? Will attach a couple photos. Most worrisome is the red wire noted in these pics.
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I'm afraid your pictures didn't come through - 'wekbit-fake-url'??
The simplest way to add pictures is with attacments.
[
attachment=15449]
Click 'Choose File' and select the image to attach.
[
attachment=15450]
Click 'Add Attachment'
[
attachment=15451]
Finally, click 'Insert Into Post'. You'll something like this show up in the text of your post:
Code:
[attachment=1234567]
Another option - especially useful if you'll be posting a lot of pictures - is to host on a third party service as described here:
http://philcoradio.com/phorum/showthread.php?tid=4371
Good idea to replace both of those wire as they carry the hv to the output tube.
OBTW not a bad idea measure the resistance between them to see if the output
transformer is good. Should see a few hundred ohms.
GL
Definitely replace those wires as they are starting to corrode, which will up the resistance and heat in the circuit.
Would loose any sleep over the heat generated at this point in the circuit.
Perhaps not so much heat would be generated, but that wire being corroded as it is would seem to me not so good, even if heat shrink was put over the top of it. You're just asking for it. That's strictly my opinion, mind you. Maybe it'll be aaaiiitte.
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attachment=15480]
So here's my next hurdle. I have some thoughts on the work around, but wanted some more experienced input. Seems the NOS speaker isn't exactly a match. Somehow need to attach it to the chassis and attach the transformer to it...welcome any and all thoughts before I proceed. The old speaker is at the bottom of the photo with welded plates...
Maybe create similar plates out of aluminum (or other) stock? Then use JB Weld to attach to the replacement speaker.
I was about to say the same as Nathan did.
Will need a hefty amount of the epoxy to hold it to the chassis bracket as there's a large leverage. Same about the transformer. But it is doable.