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Philco TPA-1 Progress . . .
PhilcoFordTesla
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#1
Sad 

12-05-2019, 12:58 AM
Got the amp working easy enough and sounds pretty decent- https://www.youtube.com/watch?v=bEtvu4ldFts but didn't have a lot of hope for the original motor after retensioning the brushes still not able to get continuity and the commutator looked burned, so decided to repower with a Mabuchi RC280 RC car motor, turns out these are just a purrfect 24MM diameter case and 2.0mm shaft size compared to the original-    

The resulting speed achieved was ~22-1/2 RPM  Icon_sad so I thought about it for a day or two while I have been waiting for a couple other motor choices, ~$2-$3 free shipping from China! 

But tonight I thought about ways to increase the speed with a sleeve over the motor shaft and picked a piece of PVC ~18ga wire insulation which got me close to the right speed, but adding a piece of shrink tubing over that made it just about the right speed at the top of the range  Icon_biggrin  https://www.youtube.com/watch?v=85gdEytzZac  The case cleaned up quite a bit with my favorite lanolin hand cleaner, a nice brush and a moist rag.

PWM controller and lower voltage motors coming soon, this one was advertised as "3, 6, 9, 12V  . . . "  17,000 rpm . . .YMMV


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PhilcoFordTesla
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#2

12-05-2019, 01:51 AM
Cartridge retrofit . . .                      

funny the 1.5" x 1/4" record adapter seems to have swollen over time and no longer fits the center holes :-(  Time to chuck it in the lathe and do some sanding and polishing!
(This post was last modified: 12-05-2019, 02:00 AM by PhilcoFordTesla.)
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PhilcoFordTesla
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#3

12-05-2019, 02:30 AM
missed this one! just before I got mine? Nicely writen ad- https://www.ebay.com/itm/PHILCO-TPA-1-AL...7675.l2557
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OldRestorer
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#4

12-05-2019, 01:10 PM
Looking fantastic!

I used the P51-2 in mine also.

Icon_smile
Times I have been electrocuted in 2021
As of 1/01/2021
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PhilcoFordTesla
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#5

12-05-2019, 02:25 PM
Thanks, sounds pretty terrible but if I can find a better solution for motor speed than a piece of shrink tubing it might help the WOW factor  Icon_crazy , but it sure sounds a lot better with an external signal! Maybe time to try one of these cartridges in another RCA player, did one a few years ago and don't recall it sounding much better though lol.   Icon_rolleyes
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Ron Ramirez
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#6

12-05-2019, 03:20 PM
Admin Note: Moved to Philco Electronic Restoration since this involves an ongoing restoration.
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Ron Ramirez
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PhilcoFordTesla
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#7

12-09-2019, 03:20 AM
Sounding quite a bit better tonight, time to put the screws back in? https://studio.youtube.com/video/-Bwe9A62syo/edit I have a Fabian record to put on for the wife, her teenage heart throb! https://www.youtube.com/watch?v=-Bwe9A62...e=youtu.be
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PhilcoFordTesla
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#8

12-10-2019, 11:36 PM
Sounds even better tonight with this little PWM controller, running here from ~7 volts but it runs well off of a single 3.7V cell. Need to pick up some Alkaline D Cells but they get like $2 apiece now so ordered a 12 pack on ebay if I don't decide to run it off the 18650's with some little regulator modules on order . . .

https://www.youtube.com/watch?v=DSjx52Unftk&t=12s
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morzh
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#9

12-11-2019, 02:06 AM
D cells are not bad at all on Amazon, and very recently Shoprite had a huge sale with the Energizer like 75c apiece. Or better.
I stocked up.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
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