Philco model 42-350t - Printable Version
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Philco model 42-350t - Eric Adams - 12-13-2012
Just got my newest project. The cabinet was in great shape before the post office got to it. The buyer gave me a refund and told me to keep it! This will be my first major woodworking task but I've got all winter to get it ready for lacquer in the spring. In the meantime I'll be digging into the insides.
Wish me luck!
RE: Philco model 42-350t - Ron Ramirez - 12-13-2012
I've said for years that the Postal Service is the worst way to ship a radio, period, end of story.
Clueless eBay sellers who do not know, or care, how to pack a radio does not help the problem.
Good luck with that damage. It looks like the dial scale survived all of that damage, though?
RE: Philco model 42-350t - Eric Adams - 12-13-2012
Thanks Ron, the dial scale looks to be the best part so far. The paint appears to be intact.
RE: Philco model 42-350t - Ron Ramirez - 12-13-2012
Good!
I like the look of these dial scales, the sort of 3D effect Philco achieved by painting different parts of the dial scale on both sides of the glass. I own one of these, and my 41-616 also has a dial glass painted on both sides.
RE: Philco model 42-350t - Eric Adams - 12-13-2012
Is there anything special I should know about it? I read that you can pick up FM if you retune the oscillator. Ever heard of that?
RE: Philco model 42-350t - Paul Philco322 - 12-13-2012
There is a nice 350 at Radiotiques, I think he is selling it complete though. You could ask. I have a 345 T very nice sounding and performing set.
Paul
RE: Philco model 42-350t - Eric Adams - 12-14-2012
Hi Ron,
Would you know where I can get an accurate schematic for this set?
So far I'm finding some that are close, but not the exact set.
The tube diagram on the sticker shows: 2)XXL, 2)7V7, 1)7B5, 1)7Y4, 1)XXFM.
These are what is in my set:
7A4s for XXLs-I know they substitute. 7B7s for the 7V7s. 7B5,7Y4 and I can't read any numbers on the last one.
RE: Philco model 42-350t - Chuck Schwark - 12-14-2012
Ahem...yes I do.
8)
RE: Philco model 42-350t - Ron Ramirez - 12-14-2012
Yes:
http://www.philcorepairbench.com/schematics.htm
Well worth the nominal cost.
Now, as to your tubes. It should have 7V7s, not 7B7s. Both are pentode amplifiers and have the same pinouts, but characteristics are different. The 7B7 has much lower transconductance, lower maximum plate voltage, and higher plate resistance than the 7V7. The 7B7 might work OK on AM and SW but probably would not work at all on FM.
Yes, 7A4 is a sub for XXL.
The one you can't read the numbers on must be the XXFM. At least, let's hope so. Are you aware of the old "rub the tube on your scalp" trick?
One more thing. I would suggest that, instead of messing with the 42-350's FM oscillator circuit, that you read the following page:
http://www.somerset.net/arm/fm_only.html
RE: Philco model 42-350t - Eric Adams - 12-14-2012
Thanks guys,
Chuck, I didn't know you lived so far, I'm in Lake in the Hills. Anyway,I put my order in and the check will go out in tomorrow's mail.
Ron, I guess I'll replace the 7B7s with the correct tubes. No, what is the "rub the tube on your scalp" trick?
I'll check out that FM site. Thanks.
Eric
RE: Philco model 42-350t - Ron Ramirez - 12-14-2012
Here's the trick:
Rub the area of the tube where the numbers should be (in the case of loctals, the very top of the tube) on top of your head. Now if you're bald, forget about it. Rubbing the tube on the hair of your head releases oils from your hair onto the tube, which then *might* allow you to see the numbers under a bright light.
Don't laugh - it works 50 to 75% of the time.
RE: Philco model 42-350t - Eric Adams - 12-14-2012
I'll give it a try. Of course I'll have to use the side of my head, but that's another story.
RE: Philco model 42-350t - Eric Adams - 12-14-2012
Son of a gun, it works!
RE: Philco model 42-350t - kporter - 12-14-2012
There's no limit to the profound knowledge available on the forum.
RE: Philco model 42-350t - Ron Ramirez - 12-14-2012
8)