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

Thread Closed
Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

philco transitone tropic model 3010-123 schematic
#16

Yes, it was nice of Philco to not reveal the value of that resistor, wasn't it? Icon_thumbdown

Using Ohm's law, we will have to calculate it.

The five tube filaments in series will drop 101.5 volts.

The radio was, most likely, designed for a 115 volt line.

Each tube filament draws 0.15 A of current. As the filaments are in series, the entire string draws 0.15 A of current.

So the original resistor would have had to drop 13.5 volts.

R = E / I

= 13.5 / 0.15

= 90 ohms

Now we have to figure wattage.

P = I squared * R

= (0.15 x 0.15) 90

= 0.0225 x 90

= 2.025 watts

In practice, we normally double the wattage dissipation, so you need a 90 ohm, 5 watt resistor.

But hold on. If the line voltage where you are at is 240 volts, then does your radio have the extra dropping resistor plugged into the J1 socket?

--
Ron Ramirez
Ferdinand IN




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Hello Rod,  Honestly I am not sure what you mean by B+ on the schematic, I am still trying to figure it out as I hadn...osanders0311 — 05:56 PM
Philco 46-1209 strange behavior
What kind of meter is it? Relative to what is the voltage being measured? Are the AC line filter caps C53A/B hooked up...morzh — 10:47 AM
Philco 42-345 Restoration/Repair
Hi, what I'm seeing on the schematic is one wire from the output transformer goes to B+ and the other goes to the 7B5 pl...RodB — 10:42 AM
schematics
The Philco Library is great for Philcos.  Great source of info. Philco Libraryslford310 — 09:59 AM
schematics
Hello MSENO, Welcome to the Philco forum and here is the schematic for that Philco! 41-290 Sincerely Richardradiorich — 09:48 AM
Philco 46-1209 strange behavior
I double checked everything around the filter caps and it all seems to be hooked up right... Here are the voltage on ...sq65 — 09:45 AM
schematics
I'm looking for a readable schematic for a 41 290. can anyone help?mseno — 09:33 AM
Rogers Majestic R-646
Since the original schematic was in an old unreadable style, I created a new schematic diagram. Owners of this radio ca...Vlad95 — 11:09 PM
I'm starting to restore a Philco 16X, I need spare parts. Help me find it
Hello Peter, What great project I am looking forward to see your progress with this console !! Sincerely Richardradiorich — 10:20 PM
Philco 42-345 Restoration/Repair
Ok guys, JustRadios has me worried after reading an article about purchasing resistors and I hope that I haven't made a ...osanders0311 — 08:59 PM

[-]
Who's Online
There are currently 1217 online users. [Complete List]
» 1 Member(s) | 1216 Guest(s)
Avatar

>