Correct way to re-install IF transformer

View previous topic View next topic Go down

Correct way to re-install IF transformer

Post by frank1956 on Wed Sep 17, 2014 11:16 am

I messed up when I removed one of my IF transformer (T1), from an old radio and did not realize there was a certain way it had to go back in i.e. color coded on the bottom. I went to put it back in when I realized my mistake. Any help would be appreciate. Next time I'll be sure to take a picture, I do have one of the bottom of the chassis, but it is hard to see the color code. Pic attached.





Thanks
Frank
avatar
frank1956
Member
Member

Number of posts : 410
Registration date : 2014-06-12

Back to top Go down

Re: Correct way to re-install IF transformer

Post by Wildcat445 on Wed Sep 17, 2014 12:13 pm

If it were me, I would assume the green terminal would be for the plate. I would measure between the green terminal and the one over your finger to make sure they have continuity. That would be the primary. The other half would be the secondary. Perhaps an expert can chime in here to correct me if I'm wrong. Good luck.

WC

Wildcat445
Member
Member

Number of posts : 5286
Registration date : 2011-09-19

Back to top Go down

Re: Correct way to re-install IF transformer

Post by frank1956 on Wed Sep 17, 2014 12:45 pm

WC, Thanks. The terminal is actually blue not sure why it looks green in the picture. Here is a bottom view of were it came from, there is a black wire, green wire, .005 cap, 1 meg resistor and a connection from tube 12BE6 pin 5, all tied into the IF transformer.

avatar
frank1956
Member
Member

Number of posts : 410
Registration date : 2014-06-12

Back to top Go down

Re: Correct way to re-install IF transformer

Post by Wildcat445 on Wed Sep 17, 2014 1:00 pm

I do not remember your saying which radio you are working on, so is it the RCA X551?  If so, and after you have found the primary and secondary of the IF transformer, you would connect the blue terminal to the connection going to the plate, pin 5, of the 12BE6.  The other wire to the primary is B+ and comes from the 50uf output filter cap.  The #3 connection on the IF transformer, the one opposite the blue terminal, goes to Pin 1, the grid, of the 12BA6 IF amplifier, and the other wire to the secondary goes to the AVC buss.  If you have questions or need assistance with any phase of this, let us know. Referring to the schematic should get you where you need to be.  Good luck.

WC

Wildcat445
Member
Member

Number of posts : 5286
Registration date : 2011-09-19

Back to top Go down

Re: Correct way to re-install IF transformer

Post by frank1956 on Wed Sep 17, 2014 1:15 pm

WC, Yes it is the RCS X551.
avatar
frank1956
Member
Member

Number of posts : 410
Registration date : 2014-06-12

Back to top Go down

Re: Correct way to re-install IF transformer

Post by frank1956 on Wed Sep 17, 2014 1:31 pm

Wildcat445 wrote:I do not remember your saying which radio you are working on, so is it the RCA X551?  If so, and after you have found the primary and secondary of the IF transformer, you would connect the blue terminal to the connection going to the plate, pin 5, of the 12BE6.  The other wire to the primary is B+ and comes from the 50uf output filter cap.  The #3 connection on the IF transformer, the one opposite the blue terminal, goes to Pin 1, the grid, of the 12BA6 IF amplifier, and the other wire to the secondary goes to the AVC buss.  If you have questions or need assistance with any phase of this, let us know.  Referring to the schematic should get you where you need to be.  Good luck.

WC


WC, there are  two (2) connection from the 12BE6 tube going to the IF transformer (pin's 5 & 6). Pin 6 is the black wire. I notice you only mention pin# 5 12BE6. confused
avatar
frank1956
Member
Member

Number of posts : 410
Registration date : 2014-06-12

Back to top Go down

Re: Correct way to re-install IF transformer

Post by Wildcat445 on Wed Sep 17, 2014 2:15 pm

Pin 6 is the screen for the 12BE6. It has B+ on in. So it would connect to the other half of the primary. What radio are you working on, make and model?

WC

Wildcat445
Member
Member

Number of posts : 5286
Registration date : 2011-09-19

Back to top Go down

Re: Correct way to re-install IF transformer

Post by frank1956 on Wed Sep 17, 2014 2:25 pm

WC,
It is another RCA X551.
avatar
frank1956
Member
Member

Number of posts : 410
Registration date : 2014-06-12

Back to top Go down

Re: Correct way to re-install IF transformer

Post by Wildcat445 on Wed Sep 17, 2014 6:06 pm

Ok, that is the schematic I am looking at. What I posted earlier should get you close. Good luck.

WC

Wildcat445
Member
Member

Number of posts : 5286
Registration date : 2011-09-19

Back to top Go down

Re: Correct way to re-install IF transformer

Post by Wildcat445 on Fri Sep 19, 2014 1:01 pm

Are you making progress on this, Frank?

WC

Wildcat445
Member
Member

Number of posts : 5286
Registration date : 2011-09-19

Back to top Go down

Re: Correct way to re-install IF transformer

Post by Sponsored content


Sponsored content


Back to top Go down

View previous topic View next topic Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum