I have a large cap that has written on it:
.03X.001 400VDC W25537
Is this a double cap of .03 and a .001 in the same unit? I am assuming it is.
I haven't seen dual caps with different values before.
I am working on a Crosley 148. The scematic that I have shows a #42 instead of a 2A5 for a pwr output in my set. I don't think they are substitutes. The only schematic I can find for a Crosley 148 does not have .001 cap in the schematic. In my set the double cap is situated with what I think is the .03 end going to the plate of the #57 and the .001 side to the grid, pin 4, of the 2A5.
Does this sound correct? I do not have anything to check it out against and it all looks original.
Thanks, Bob

The two caps should connect together at one end as shown in the schematic. Where they connect together they should be connected to the #57 plate. The .03 MFD goes to the grid of the output, and the .001 MFD goes to the chassis. It is substituted for the .0006 MFD cap. Either will work. The .001 MFD will mute a bit more tone....perhaps a bit too much, though it'll probably be alright.

Regarding the output, if it is a 2A5, then the power transformer must have a 2.5 volt winding. If the power transformer has a 7.0 volt winding, then the output tube is a #42, and the RF tubes are strung in series (2.5 + 2.5 + 2.5 = 7.5). The pilot lamp is strung across one of them, which makes it glow slightly dimmer, and the other two slightly brighter. I'm not fond of it. I say use a 6-8 volt bulb, and wire it directly to the filament winding. If it is too bright, use a 12 volt bulb, or add a resistor.

T.

Thomas,
I am fairly certain that my set was manufactured with the 2A5. It has 2A5 stamped into the base and it is also listed in the Mallory Service Encyclopoedia 1948 6th edition as having a 2A5 vs a 42. I wish I could find that schematic as I am not very swift at analyzing these without looking at a correct schematic for what I am working on.
The set I have is enough different from the schematic that I have to go more by what is in the set "as it is" replacing components. You say the
.03 Cap goes to the grid of the output but my set has it going to the Plate of the 57. You say the .001 is
a sub for the .0006 but the .03 and the .001 are (or were) one of those dual caps all looking original.
So this is confusing me. I cannot refer to the schematic in the output circuit for information on
replacing this components I guess. Is there a place
or person who might have a schematic of the Crosley 148
when it used a 2A5 like in my set that you know of to look for? I think I will post this as a separate post.
Thanks, Bob

The two caps should connect together at one end as shown in the schematic. Where they connect together they should be connected to the #57 plate. The .03 MFD goes to the grid of the output, and the .001 MFD goes to the chassis. It is substituted for the .0006 MFD cap. Either will work. The .001 MFD will mute a bit more tone....perhaps a bit too much, though it'll probably be alright.
:
:Regarding the output, if it is a 2A5, then the power transformer must have a 2.5 volt winding. If the power transformer has a 7.0 volt winding, then the output tube is a #42, and the RF tubes are strung in series (2.5 + 2.5 + 2.5 = 7.5). The pilot lamp is strung across one of them, which makes it glow slightly dimmer, and the other two slightly brighter. I'm not fond of it. I say use a 6-8 volt bulb, and wire it directly to the filament winding. If it is too bright, use a 12 volt bulb, or add a resistor.
:
:T.

The .03 MFD cap goes FROM the plate of the 57 TO the grid of the 2A5 or 42. The .001 MFD or .0006 MFD cap goes FROM the plate of the 57 TO the chassis.

If you want to know whether your set should have a 2A5 or a 42, it is a simple matter to measure the voltage across pins 1 and 6. If it's around 2.5, then a 2A5 should be used. If it's around 7.0 volts, then a 42 should be used.

Regarding my saying that the .001 MFD cap is a sub for the .0006, I didn't mean that it wasn't original, but rather that the manufacturer substituted one for the other. The Crosley 148 seems to be a set that made use of a lot of surplus components, even though it was produced in mass. Good clues are the mix of 2.5 volt and 6.3 volt tubes, and such, and various changes that occurred during the set's manufacture span.

I took a peek at my set, and it also has the .001 MFD cap in place of the .0006 MFD cap (yes, the .001 and .03 are both in the same container). The schematic shown on this web site should be just fine for you, other than minor variations such as capacitor values, and that the sets with a #42 tube will have all of the 2.5 volt tubes wired in series. The sets with a 2A5 tube will have all of the tubes wired in parallel (except for the #80). I am sure that if you follow the schematic values, or the values actually found in your radio, you will, in either case, wind up with a fine working radio.

T.