Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5

I Need To Clarify CT Connection
#1

This is on a 40-190.
http://www.nostalgiaair.org/PagesByModel...013339.pdf
I believe someone wired this set wrong and I need to clarify the connection of the CT of the high voltage output from the power transformer. Originally when I got this set the CT was connected to chassis ground. My notes and pictures verify this. I don't know if this is why the rectifier was blown and the power transformer was fried but I don't believe this CT goes to ground in this set. I believe it's B-.

The CT should be isolated from ground and connected to part #60, 150 ohm 1 watt resistor, neg. side of the 12ufd filter cap and on from there. Is this statement correct?

Thanks,
Pepper

"It's Nice To Be Nice To The Nice"
Major Frank Burns Mash 4077th
#2

Yes you are right if this is the correct schematic. Looks like an 'expert' was in there. Hope the power transformer isn't fried. Have a look at all the speaker, field coil, voltage dividers and add a fuse to the set.
#3

Thanks! Someone was in here alright and the power supply that's on it now is not original. This was discussed in another post. It's high voltage output is 250-0-250 and the 84 rectifier was changed to a 5Y3. Even though the 5Y3 has a plate rating of 350-0-350 I'm told the 5Y3 should be fine and same for this transformer. All my filaments add up to 2 amps and this transformers 6.3Vac output is rated at 2.5 amps. Find out when she smokes.

Audio output transformer was fried. Got another on order. Everything else you mentioned looks okay but I'm overhauling the whole set anyway. Except for in a Zenith, I've never seen this much dried and cracked wiring. Maybe the set was dinked with so bad that all the wiring got hot, dried and cracked. Icon_lol

Johnny

"It's Nice To Be Nice To The Nice"
Major Frank Burns Mash 4077th
#4

Nah its a problem with all the rubber coated wiring from the late 30's and 40's. It's funny some color of wiring is fine and other colors are so bad just looking at them seems to make the coating fall off.

-Keith
#5

I need more clarification but this time on the connection of the + side of the 12ufd filter cap #61. The radio was altered and is running a 5Y3 rectifier instead of the 84. The 84 had the indirectly heated cathode but the 5Y3 doesn't have a cathode. I've looked at other radios that are running a 5Y3 and it looks like the + side of my 12ufd will connect to the field coil as shown on the schematic but also connect to one leg of the 5Y3 filament. Is this correct? Here is the NA copy of this 40-190.
http://www.nostalgiaair.org/PagesByModel...013339.pdf

Thanks,
Pepper

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




Users browsing this thread: 1 Guest(s)
[-]
Recent Posts
Looking for place to donate unique Philco Philco J-1930 Prototype
Given the 1960s vintage, it is likely that the cartridge is ceramic, likely more stable. The changer looks like a Voice...MrFixr55 — 05:03 PM
Jackson 665 j2 schematic request
FIXED!daveone23 — 03:55 PM
Bakelite crack repair - what is best epoxy?
Thanks everyone. I appreciate you sharing your experience and looks like I'll work with the 24 hr two part clear epoxy....de371 — 10:25 PM
Jackson 665 j2 schematic request
Without a schematic its going to be hard tracing the wire wound spool resistors.daveone23 — 05:21 PM
Jackson 665 j2 schematic request
Looking for a schematic for the 665 j2 multimeter.daveone23 — 04:42 PM
Looking for place to donate unique Philco Philco J-1930 Prototype
>>I'll write to the Henry Ford. I heard, his secretary answers his mail, not he himself.morzh — 12:15 PM
Philco 48-200 alignment questions
Just checked the power cord and I did in fact wire it so the hot side (small prong) goes to the switch.transitony — 11:52 AM
Looking for place to donate unique Philco Philco J-1930 Prototype
Thanks for the suggestions.  I'll write to the Henry Ford.   That would certainly make sense since by the time this prod...jeibner — 11:49 AM
Looking for place to donate unique Philco Philco J-1930 Prototype
For what it's worth, the Henry Ford Museum and Greenfield Village in Dearborn, Michigan may be an option. The obvious ...GarySP — 11:39 AM
Help with Readrite 410 tube tester
Mike and I just had a short discussion yesterday about this very subject. So often it's the connections. Ya gotta have t...RodB — 10:08 AM

[-]
Who's Online
There are currently 2391 online users. [Complete List]
» 2 Member(s) | 2389 Guest(s)
AvatarAvatar

>