Philco Model 048 all purpose set tester - Printable Version
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+--- Thread: Philco Model 048 all purpose set tester (/showthread.php?tid=1785)
Philco Model 048 all purpose set tester - Blaine - 04-06-2009
Just acquired a model 048 set tester , ordered some literature from the Philco Repair Bench. I know this unit used batteries. Are there modern day battery packs that one can use in this unit ? And has anyone converted it to Electric. I just love the Philco test equipment. Thanks for any info.......
Re: Philco Model 048 all purpose set tester - batterymaker - 04-08-2009
If this is the one that uses the little P-15-135 22.5 volt battery, I've done them before.
This is a very rudimentary version--I think I can do better now.
Bill
[Image: http://users.mw.net/~bmorris/finishedp15b5.jpg]
[Image: http://users.mw.net/~bmorris/distribution2.jpg]
Re: Philco Model 048 all purpose set tester - Chuck Schwark - 04-08-2009
Bill,
The 048 Tester uses four battery voltages. The VOM section uses a 4.5 volt for the ohms function (isolated from the other cells).
The Sig gen section uses two voltages; 1.5 and 22.5. The two voltages are in "series" in the battery. the (+) of the 1.5 cell is common to the (-) of the 22.5 and brought out to a terminal (3 terminals). Can't clearly see the socket on the top of your battery pic.
Chuck
Re: Philco Model 048 all purpose set tester - batterymaker - 04-08-2009
The battery is a five-pin socket with various taps totalling 22.5 volts.
Re: Philco Model 048 all purpose set tester - Chuck Schwark - 04-08-2009
The two sets of battery voltages need to be separate. Here is the partial schematic.
The VOM section is to the right and Sig gen on the left.
[Image: http://www.philcorepairbench.com/pics/048schem.jpg]
Looks like the VOM battery has two "taps" at 3 and 4.5 volts. No total battery voltage given.
9 volts? 12 volts maybe?
Chuck
Re: Philco Model 048 all purpose set tester - batterymaker - 04-08-2009
There is one other thing--along with the 22.5, I think the rig takes a couple of D cells as well.
Re: Philco Model 048 all purpose set tester - Chuck Schwark - 04-08-2009
That would be two D-cells in parallel for the 1.5 volt filament, as shown, for the number 30 tube, I assume.
Re: Philco Model 048 all purpose set tester - batterymaker - 04-08-2009
Sounds right--I've never seen one of them in the flesh, but I remember making batteries for one.
Re: Philco Model 048 all purpose set tester - batterymaker - 04-09-2009
Here's a socket layout of that particular 22.5 battery....[Image: http://users.mw.net/~bmorris/225socket.jpg]
Re: Philco Model 048 all purpose set tester - Chuck Schwark - 04-09-2009
Just add more info to the "fire."
Reading sales flyers for the 048, it mentions battries (plural) and probes included.
Looks like there are two B-C A-B battery packs in there then. Makes sense since the two units in the same box are originally two separate test sets updated to make up the 048.
Chuck
Re: Philco Model 048 all purpose set tester - batterymaker - 04-09-2009
You know, I don't think I made one for this unit then.
More I think about it, I think it was for an 024. I assume this unit incorporates the 024 and some other equipment?
Re: Philco Model 048 all purpose set tester - Blaine - 04-09-2009
Thank you very much.................. I will visit my local Radio Shack tomorrow and buy some batteries.