Welcome Guest! Be sure you know and follow the Phorum Rules before posting. Thank you and Enjoy! (January 12, 2025) x

Thread Closed

Philco TPA-1 Progress . . .
#1
Sad 

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


Attached Files Image(s)
               
#2

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!
#3

missed this one! just before I got mine? Nicely writen ad- https://www.ebay.com/itm/PHILCO-TPA-1-AL...7675.l2557
#4

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
#5

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
#6

Admin Note: Moved to Philco Electronic Restoration since this involves an ongoing restoration.

--
Ron Ramirez
Ferdinand IN
#7

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
#8

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
#9

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.




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco P45-6365 Universal Transformer Instruction Manual
Can anyone guide me to where this may be found?GRG — 03:00 PM
54C Complete Teardown/Rebuild
I don't think that I have encountered a 12Z3 before, curious how it uses one of those but includes a #43, which is a 25 ...Arran — 02:17 PM
HiFi (Chifi) tube amp build - but my own design.
It's the other forum. I'm also in DIY, but mostly read there. Honestly, I kinda jumped into this without much thought to...TV MAN — 10:43 AM
Philco 71 Code 125
Hello,  I am in need of a schematic for this radio. Mine has the three separate circular tube shields and a shadow me...dconant — 08:06 AM
Stromberg Carlson 1500 Squeal
And life just keeps getting more complicated.dconant — 07:57 AM
54C Complete Teardown/Rebuild
Hello Roy, here is this one sincerely Richardradiorich — 12:45 AM
54C Complete Teardown/Rebuild
Richard, Had grabbed it already but thank you just the same.  I find myself wanting to find some way to block out the...glyphmon — 12:03 AM
54C Complete Teardown/Rebuild
Hello roy, here is a link to the schematic . Sincerely Richardradiorich — 11:54 PM
54C Complete Teardown/Rebuild
Richard, The Silvertone 2014 also is a transformerless set, so I am incorporating a 1:1 600 ohm audio isolation transfo...glyphmon — 11:37 PM
Preliminary work on wife's Silvertone 2014
Did an alignment today which was interesting.  IF alignment went great, almost all was already spot-on.  Adjusting on th...glyphmon — 11:35 PM

[-]
Who's Online
There are currently 2649 online users. [Complete List]
» 1 Member(s) | 2648 Guest(s)
Avatar

>