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

46-480 Power Transformer Vibrates
#9

Well here's what I've done thus far.

I completely overhauled the bandswitch along with the whole RF section. Seperated all the wafers from the bandswitch and thoroughly cleaned each one of them. Replaced all original caps and resistors with new components. I replaced all mica caps with silver micas. I installed new tube sockets for the 7F8 and 7H7 along with all new wiring. I replaced one of the chokes on the 7F8 filament. Didn't like the way it looked even though it did read less then 1 ohm. And I'm not really sure what those chokes do.

I went through all three of the IF cans and replaced all the mica caps along with any resistors I found. Installed all new wiring from the cans to their connection points in the radio.

Now my 1K resistor doesn't get hot any more but I still have problems that I haven't been able to isolate even with the signal generator or DVMM. All my voltages are within tolerance and a set of NOS tubes installed although all the tubes that were in it test good. All Loctal pins scraped until nice and shiny. I replaced a few of the caps in the main chassis but everyone I took out was good. Figured I was wasting my time and came here. I did install new E-caps.

The radio is motorboating only when I turn the volume and tone controls up. I still have no reception on any bands and the motorboating is there on all bands with no change.

Any ideas would not only be helpful but greatly appreciated.

Johnny

"It's Nice To Be Nice To The Nice"
Major Frank Burns Mash 4077th


Messages In This Thread
46-480 Power Transformer Vibrates - by Pepperoni - 07-28-2013, 10:18 PM
RE: 46-480 Power Transformer Vibrates - by Pepperoni - 08-22-2013, 08:49 PM
RE: 46-480 Power Transformer Vibrates - by EricS - 09-17-2013, 07:09 PM



Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
PT 6 chassis screws size???
Hello bridKarl, that sounds right or maybe 8/32 . Sincerely Richardradiorich — 01:00 AM
PT 6 chassis screws size???
Have this done except for missing chassis screws. It looks like 1 inch 6/32 sheet metal screw may work but can anyone s...bridkarl — 10:32 PM
Philco model 38 code 121 not receiving signal.
Hello Stormlord, Well done on rewinding that coil it turned fairly good for your first one. Sincerely Richardradiorich — 09:12 PM
Philco model 38 code 121 not receiving signal.
Well here it is. It ain't pretty, but hopefully it'll work. I checked it with my DMM on continuity and it keeps and r...Stormlord5500 — 08:56 PM
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

[-]
Who's Online
There are currently 722 online users. [Complete List]
» 1 Member(s) | 721 Guest(s)
Avatar

>