My Second Radialva Groom Restore

[pwdrive]

Why cant you adjust the slugs John?

Hi Gary, what puts me off in this case if the service sheet says very clearly that the alignment is done at the factory and then "glued" in place so no alignment is possible afterwards.

I have one or two IF transformers from a parted out set so I'll experiment on those to see if I can get them to adjust. Thanks for the encouragement!

Cheers, John

Hi John, from what you have just said it would sound like there were no alignment instructions for the IF transformers, is this so?

Also remember that when the transformers are all back in circuit a certain amount of stray capacitance will be introduced by the wiring, valve bases, interelectrode valve capacitances etc all these will effect the resonant frequency.
I would be tempted to temporarilary connect the transformers in circuit and get the reciever up and working, you can get a better idea then as to what's what, if the cores do have to be adjusted then as Gary says they normally come round by using various techniques to free them up if needed. If they do need adjusting and they are definately unmovable then it's either find a set of transformers that do or convert to capacity tuning with some small adjustable trimmers.
Just throwing some ideas up in the air.

By the way, just to discount one possibility, were any vintage domestic sets stagger tuned on AM, anyone know?

Lawrence.