Making a 455 KHZ IF CAN from Scratch Part 1

[@Centar1964]

You are one of the very few that actually understand how things work and I actually learned something new (spacing within IF cans). We need more like you.

[@roberthorseman7432]

Hello John I have made these almost exact to yours made up an experimental radio with some 6j17b valve's it works really well thanks for your knowledge .Regards Bob.

[@jimpatchell2660]

Very nice video. Like it when I can learn a bit.

[@tucker934]

This is some serious skill! I’m working my way there, and the ride has been absolutely amazing!

[@edmondedwards6729]

nice to see a quality construction display, thanks for the upload

[@JohnAlexanderBerry]

Well done 👍

[@DenEiferer]

I did this a handful of years ago. Experiments showed that Litz wire was crucial to getting any kind of Q. Otherwise you get overly wide transformers with high insertion loss.

[@johnkleinbauer4424]

It is what it is there! Nitpicker!

[@DenEiferer]

@@johnkleinbauer4424 I'm not insulting your transformers. Looks like you've done a fine job, and you know a lot more than I did the last time I tried this.

[@robertarchuletta2498]

So we were talking about Q and bandwidth. This is a good example here. This is a 455 khz IF. That means that the primary and secondary tank circuits are resonant at 455 khz. Your coils are 1 mh and your caps are 120 of. So at resonance Xl=Xc which is roughly 3000 ohms. So what is the Q? Not very high I would assume. Certainly not anywhere as high as one of your torroid coils.

[@ingussilins6330]

Clever design :) fixed inductors and trim caps. If will made variable gap between coils, can made variable BW in IF stage.

[@UpcomingJedi]

There should be a video about 'My grandma used to say' sayings. Mine used to say batteries were cheap and quality made. They used to cost around 30 cents and now they are around 3 dollars. What i find more surprising is that after over 50 years in a voltmeter, this here C cell hasnt leaked, ruining the battery holder at least. Sad that things are now made so disposable.

[@chachavessel]

Brilliant mate!

[@lomgshorts3]

A radio is none more than a big pass band filter, and an audio amplifier combined.

[@aerofart]

Radio Magic!

[@UpcomingJedi]

Too bad demand waned for these things that they are no longer made. To avoid storing parts in the post office and stopping my projects, i try to keep most used things in stock at least half dozen. Meow!

[@johnkleinbauer4424]

I have tons of parts. When I recap I have to replenish my stock. I also order new items that I never used before. I never ran into 50 silver mica caps all being leaky. It took time to track all the caps down at a good price. I don't stock silver micas. Well now I do!

[@ericschulze5641]

You said the adjustment moves the coils further apart. . . Maybe it moves them closer together. Hmm hmm 😊

[@johnkleinbauer4424]

Put that in one of your videos! Wait! You don't have any!

[@ericschulze5641]

@@johnkleinbauer4424 Hey! I was just doing the glass half full half empty thing ,I wasn't slamming you

[@johnkleinbauer4424]

@@ericschulze5641 Wrong size glass!

[@ericschulze5641]

@johnkleinbauer4424 good point

[@ovi_4]

Hi, very good and informative IF can making video. However, one thing is not clear to me. You seem to "praise" the old can very much (the one that you've opened) saying that they are properly made with multistranded wire wound over a ceramic tube and brass variable caps etc. Now my question is: How come you don't replicate those exactly (in your DIY can construction ?) I'm fairly sure that ceramic tubes , multi-stranded wire and brass variable caps (of some sort) still exist for sale and one could mix and match them to get the same results. After all the aim here (as I understood it) is to get not only sensitivity but selectivity. Inn other words, do your cans (the way you made them) have the same characteristics (or very close to it) and therefore you've decided that there's no need to go "over the top" and copy those old ones? I'm definetly going to give it a try at building one like yours to see. Thanks for the inspiration!

[@johnkleinbauer4424]

My goal was to show how to make one using easy to find parts. I guess you missed the concept!

[@ovi_4]

@@johnkleinbauer4424 I surely did thank you. I will give it a try. because I so happen to already have the necessary. (no need to order any things at all) Thx. once again, Very informative. Thank you.