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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
AC: 4 DC: 1
Last year: 6
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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
Ferdinand IN
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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.
(This post was last modified: 12-11-2019, 02:06 AM by morzh.)
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