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

Alignment instructions needed
#16

yeah ok, ill give that a try tonight.

Still dont know whats up with that motor boating and poping when the radio is first turned on but I'll deal with that once I get it playing good again.

-Keith
#17

Sounds like an alignment issue. Once you get the IF on track I bet that will resolve it.
Terry

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#18

Ok I went through the alignment again with the sig gen turned all the way down. When I was turning some on the caps the tone would come blasting in through the speaker. I had the Sig gen turned all the way down and on LO setting on the course Attn. Dont know why unless there is something wrong with my sig gen.

But after I Re aligned stations are comeing in better now. But there is a lot of static i tried different antenna and turning everything that generates interference off but I cant clean up the sound. Only the few very strong stations come in loud and clear.

All the coils ohmed out good, tubes tested strong.

best part its getting better!!

-Keith
#19

Keith,
Try the high attenuation setting on your sig gen. The higher the attenuation of the signal the lower the output.
John
#20

Well we got the radio playing very well stations from all over the dial are coming in its very sensitive..

One lingering problem remains is it will pop and squeal sometimes motorboat for about 5 seconds when its first turned on then it will go clear and play just fine after that.

We checked all the new caps swaped tubes around problems still there. Anyone have any ideas on what to try?

-Keith
#21

Try detuning the IF stage just a little. Or you can troubleshoot it by unplugging the tubes starting at the mixer and working your way back towards the 42. Leave the 80 in place. When it stops that's the stage you'll need to have a look at.

When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!

Terry
#22

Thanks I'll give that whirl tonight..

-Keith
#23

It looks to me and we suspected that the 36 tube might be bad. If I remove the tube and power the radio up its quiet, when I put it back in the motorboating and squealing happens again. It was motorboating for a long time on one of the power cycles and I detuned the primary of of the 1st IF and got it to stop but then couldnt receive any stations. I tried powering the radio off and turning it back on (while detuned) and it still did its little dance before going quiet.

I tested the 36 tube on my tester and it is just in the good range, and it shows a short on pin 4 cathode. The short indicator was just lighting wasnt real bright, but the light doesnt light at all on the other pins accept the filament which i'd expect.

I ordered a 36 tube on ebay and it should be here in a few days ill give that a try and see what happens.

-Keith
#24

The new 36 tube did the trick no for popping and motorboating on power on.

Thanks everyone that helped out.. Now on to the cabinet..

-Keith




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Philco 42-345 Restoration/Repair
Yes, 57 is an electrolytic cap that should be 12 mfd 400 volts according to the parts list from the Phorum library schem...RodB — 06:01 PM
Philco 42-345 Restoration/Repair
Looks like if I am reading it correctly it looks like the silver capacitor#57 that appears to be a replacement is of a l...osanders0311 — 05:09 PM
Philco model 38 code 121 not receiving signal.
Thanks Arran. Yeah this plastic is pretty thin. It's a little thinner than the original stuff. It kinda reminds me of p...Stormlord5500 — 04:37 PM
Testing a speaker and output transformer Trutone A2-G
The equivalent of one short turn is basically the same as that of a shorted load. If it is the primary's turn, then the ...morzh — 03:53 PM
Testing a speaker and output transformer Trutone A2-G
I've never had an output transformer become shorted, the failure mode is usually an open primary, or in a center tapped ...Arran — 03:52 PM
Philco model 38 code 121 not receiving signal.
As long as the plastic sheeting isn't too thick, I think that the thickness of photographic film would be just about rig...Arran — 03:19 PM
Philco model 38 code 121 not receiving signal.
Well why not! :lol:Stormlord5500 — 03:14 PM
Philco model 38 code 121 not receiving signal.
Good luck next thing you know you will be winding coils just for the fun of it. DavidDavid — 11:29 AM
Testing a speaker and output transformer Trutone A2-G
morzh Short-circuited turns can be considered as a half-dead transformer. But on this case transformer will hot and s...Vlad95 — 11:01 AM
Testing a speaker and output transformer Trutone A2-G
I am not sure how a transformer could be weak. It could be inadequate, but only when you replace the original with somet...morzh — 09:56 AM

[-]
Who's Online
There are currently 2211 online users. [Complete List]
» 2 Member(s) | 2209 Guest(s)
AvatarAvatar

>