Hello all,

Warren has helped me change out the Mica caps in my IF Transformwers for a AA5 radio. I have become interested in these cans as to application per radio circuit.

My example is this: when i received the IF's back from Warren one of the slugs had been damaged from a previous repair probably years ago where the slot in the slug would not accept the alignment tool and a piece of it broke off. I removed the IF from the radio and the metal can. The alignment slot was chipped and could be maybe milled to accept the alignment tool or be replaced with a new one.

I searched the web and found two NOS 455 KHz IF Transformers, no idea for what radio. I asked the seller to take the can off and send me a picture so I could verify the slugs. The slugs matched my damaged slug so I bought them. I was able to replace the damaged slug with a new one and calibrated the IF out of the radio with a signal generator and scope. I hope I won't have to make much of a change to the can once I start the final alignment.

I then tested one of the new cans with the signal generator and scope. It was dead on at 455 KHz, tweaked and retweaked to same alignment, you would think that I could have used the new can in my radio, I think Warren said no with some explanation, but did say to post the question on NA.

The capacitor values and resistance of the coils were different from my IF cans, yet it was dead on at 455 KHz.

Why can't a 455 KHz IF TRansformer which is aligned properly be used in any radio? Is there not a common standard beside the 455 KHz requirement?

I only bought the NOS IF's for the slugs, but have this question to better understand these circuits and hope this post will help others also.

Thanks,
Mitch

Mitch,
Other circuit parameters affect the type/winding config/resonating cap etc. Different tubes/SS devices may require different circuit impedances for optimum performance. Typically the active device is selected first, based on design goals, then intra circuit hardware is developed for optimum interface meeting performance goals.

marv

:Hello all,
:
:Warren has helped me change out the Mica caps in my IF Transformwers for a AA5 radio. I have become interested in these cans as to application per radio circuit.
:
:My example is this: when i received the IF's back from Warren one of the slugs had been damaged from a previous repair probably years ago where the slot in the slug would not accept the alignment tool and a piece of it broke off. I removed the IF from the radio and the metal can. The alignment slot was chipped and could be maybe milled to accept the alignment tool or be replaced with a new one.
:
:I searched the web and found two NOS 455 KHz IF Transformers, no idea for what radio. I asked the seller to take the can off and send me a picture so I could verify the slugs. The slugs matched my damaged slug so I bought them. I was able to replace the damaged slug with a new one and calibrated the IF out of the radio with a signal generator and scope. I hope I won't have to make much of a change to the can once I start the final alignment.
:
:I then tested one of the new cans with the signal generator and scope. It was dead on at 455 KHz, tweaked and retweaked to same alignment, you would think that I could have used the new can in my radio, I think Warren said no with some explanation, but did say to post the question on NA.
:
:The capacitor values and resistance of the coils were different from my IF cans, yet it was dead on at 455 KHz.
:
:Why can't a 455 KHz IF TRansformer which is aligned properly be used in any radio? Is there not a common standard beside the 455 KHz requirement?
:
:I only bought the NOS IF's for the slugs, but have this question to better understand these circuits and hope this post will help others also.
:
:Thanks,
:Mitch
: