[Blaine]

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.......

[batterymaker]

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]

[Chuck Schwark]

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

[batterymaker]

The battery is a five-pin socket with various taps totalling 22.5 volts.

[Chuck Schwark]

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

[batterymaker]

There is one other thing--along with the 22.5, I think the rig takes a couple of D cells as well.

[Chuck Schwark]

That would be two D-cells in parallel for the 1.5 volt filament, as shown, for the number 30 tube, I assume.

[batterymaker]

Sounds right--I've never seen one of them in the flesh, but I remember making batteries for one.

[batterymaker]

Here's a socket layout of that particular 22.5 battery....[Image: http://users.mw.net/~bmorris/225socket.jpg]

[Chuck Schwark]

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

[batterymaker]

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?

[Blaine]

Thank you very much.................. I will visit my local Radio Shack tomorrow and buy some batteries.