Sansui 7070 Tuner Board (F-2614) Missing RFTransformer

[Richard P]

I'm bringing a clean 7070 back to life and am getting close to firing it up - just waiting on the new output transistors and some fuses to arrive - but I've run into a possible issue with the tuner board (F-2614). One of the FM discriminator transformers appears to be missing - T03. The solder pads on the foil side of the board seem to indicate that someone pulled it. Since the alignment procedure references T03 for discriminator adjustment, I'm thinking I'll need to find a replacement. Does anyone have any thoughts about what I could replace it with. I can't find to many specs on that transformer. See photos below for reference. From what I can deduce using the HA1137W datasheet, it's has an internal 100 pF capacitor, but I can't find much else. Photos of F-2614 boards I've found show it has a white adjusting slug . . . Thanks in advance.

Rich

 

[kwayde]

There's a guy parting out a 7070 on ebay right now. Search for "Parting out Sansui 7070" and ask him how much he wants for that board.

 

[Richard P]

I messaged the seller on ebay, but no response. I'll keep looking - maybe one of the 10.7 MHz cans I have on hand will be close enough to work . . . longshot at best.

 

[kwayde]

I messaged the seller on ebay, but no response. I'll keep looking - maybe one of the 10.7 MHz cans I have on hand will be close enough to work . . . longshot at best.

There's this also, but I've found they have many parts listed for sale that are no longer in stock. Worth a shot if you think the price is fair.
https://www.awelectronics.com/sansui-7070-tuner-board

 

[Richard P]

Thanks. I saw that one as well. I got the replacement selector switch for this unit from them . . . might have to pick up that board as well. I'll get everything else done, try an alignment with the transformers I have and then decide if I need to buy it.

 

[Richard P]

I finished up the 7070 tonight. I installed a 10.7 MHz transformer can that I had pre-tuned (attached photo), finished up all the other work and hooked it up for the alignment. Step 2 in the alignment procedure is the discriminator adjustment and the first part had me adjust my newly installed can to center the tuning meeting. A partial turn brought the meter to center with no issues. The rest of the alignment went well, in spite of the typos and vague instructions that need to be interpolated. AM and FM are now spot-on and work as they should . . . Thanks for all the feedback and suggestions.

Rich