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> Help Finding Tuning Slug For An Inductor
Damo666
Posted: January 10, 2010 03:43 am
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Hi guys. Just picked up an old cb(sold as spares and repair)from Ebay and obtained a service manual. The person who had it before me has been playing around with his Golden screwdriver and removed and lost a tuning slug from an if can, the receive is therefore out of tune slightly. I've had a browse around on Google to find a pic showing what these if cans look like. They're circular as opposed to the regular square shaped variants. There are a few here http://s1.guide-images.ifixit.com/igi/eKvf...YlwY2q.standard. Any ideas where i could obtain any of these tuning slugs, short of finding an old transistor radio please. I've tried removing the slugs from the square can versions in a broken set, but they wont come out. All help on this is much appreciated. Don't really want to be stuck with a large paper weight
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sherlock ohms
Posted: January 10, 2010 03:59 am
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would it be an option to replace the whole can with the square one you have, rather than just using the slug?..i have no idea what i'm talking about, just thought i'd ask.. unsure.gif


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Damo666
Posted: January 10, 2010 04:10 am
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Hi. Unfortunately, the schematic thats shown in the service manual just says 455khz-B for the inductor that's missing the slug. No idea how many micro-Henrys it is so i wouldn't like to hazard a guess.
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Nothing40
Posted: January 10, 2010 06:39 am
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Be careful trying to remove them,after so many years they get kinda seized in there,and they are very easy to crack/shatter.

Other than that,if you can find one that will fit,it should work fine.

The ones in the square can's are often wider than the hole on the can.If you unsolder the can,you should be able to remove the slug fairly easily.


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Damo666
Posted: January 10, 2010 11:49 am
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Cheers for that nothing 40. Does the tuning slug come out of the bottom of the square can, and are these slugs a universal size do you know? Any idea what the various colours on the tuning slugs denote too please? Thanks again.
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CWB
Posted: January 10, 2010 11:56 am
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all slugs are not created equal .

try heating the slug with a soldering iron . this will soften the wax or other agent used for vibration resistance .
in some cases , using ronsonol lighter fluid or it's equivalent (notice how i avoided using the chemical name because of the differences in terminologies ?) will help soften the material .

the slug color is used in some cases to denote what the function of the coil/transformer is . ... LO , mixer , IF , detector .


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Nothing40
Posted: January 10, 2010 12:30 pm
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Well,there's generally IME, two different types.. one is a "cup" shape (usually with a flat slot on the top,and painted whatever color) and the "screw" type, with a hex type hole in the center,or sometimes a slot in the center.
The 'cup' type ones are usually used in the transformers with the metal shield/can on the outside,and they are wider than the opening in the can.. The other ones will usually unscrew and come out,if you're careful.

I'll take a pic if anyone wants some further identification of the two types.


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tekwiz
Posted: January 11, 2010 01:25 am
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If you can take a close up pic of the coil that's missing the slug, with a ruler next to it, I can check if I have any in my parts mine. Quite likely I do. AFAIK, they only use a few standard sizes in most CBs. wink.gif


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Damo666
Posted: January 11, 2010 01:26 am
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Ok guys. I pulled out a TOKO square IF transformer and managed to easily remove the slug. Problem is, it's about 1.5mm too wide to fit into my IF transformer. The one i require is 6.5mm dia x 6mm length cup-style with a recessed slot for turning it. Any ideas if one of these could be salvaged from an old tv set or similar?
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Damo666
Posted: January 11, 2010 01:31 am
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QUOTE (tekwiz @ January 11, 2010 01:25 am)
If you can take a close up pic of the coil that's missing the slug, with a ruler next to it, I can check if I have any in my parts mine. Quite likely I do. AFAIK, they only use a few standard sizes in most CBs.  wink.gif

Thankyou very much Tekwiz, i'm very grateful. Unfortunately, i can't take pics as i do all my browsing and posting from a mobile phone. However, the head of the slug is yellow, with a flathead slot, 6 - 6.5mm dia x exactly 6mm length. If you look at the link i posted initially, it looks the same as the slugs on the top of the pcb that have a bit of white paint or similar on them.

This post has been edited by Damo666 on January 11, 2010 01:34 am
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tekwiz
Posted: January 11, 2010 01:34 am
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A glance at the TV or whatever's board should tell you that. If a slug fits, it'll likely work. wink.gif


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To him, mere toys of the moment, to be overturned at the flick of a finger.

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sherlock ohms
Posted: January 11, 2010 11:07 am
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QUOTE (CWB @ January 10, 2010 11:56 am)
all slugs are not created equal .


..What?.. no double entendre ?... are you not feeling well Larry?.. tongue.gif


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CWB
Posted: January 11, 2010 02:10 pm
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it is a sort of dual meaning ...
or more so , a partial paraphrase .


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tekwiz
Posted: January 11, 2010 08:17 pm
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QUOTE (Damo666 @ January 10, 2010 04:31 pm)
QUOTE (tekwiz @ January 11, 2010 01:25 am)
If you can take a close up pic of the coil that's missing the slug, with a ruler next to it, I can check if I have any in my parts mine. Quite likely I do. AFAIK, they only use a few standard sizes in most CBs.  wink.gif

Thankyou very much Tekwiz, i'm very grateful. Unfortunately, i can't take pics as i do all my browsing and posting from a mobile phone. However, the head of the slug is yellow, with a flathead slot, 6 - 6.5mm dia x exactly 6mm length. If you look at the link i posted initially, it looks the same as the slugs on the top of the pcb that have a bit of white paint or similar on them.

Internal or external threads?


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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Damo666
Posted: January 12, 2010 12:46 am
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QUOTE (tekwiz @ January 11, 2010 08:17 pm)
QUOTE (Damo666 @ January 10, 2010 04:31 pm)
QUOTE (tekwiz @ January 11, 2010 01:25 am)
If you can take a close up pic of the coil that's missing the slug, with a ruler next to it, I can check if I have any in my parts mine. Quite likely I do. AFAIK, they only use a few standard sizes in most CBs.  wink.gif

Thankyou very much Tekwiz, i'm very grateful. Unfortunately, i can't take pics as i do all my browsing and posting from a mobile phone. However, the head of the slug is yellow, with a flathead slot, 6 - 6.5mm dia x exactly 6mm length. If you look at the link i posted initially, it looks the same as the slugs on the top of the pcb that have a bit of white paint or similar on them.

Internal or external threads?

The slug has an external thread. By that, i mean the sort that'd fit in this IF transformer http://www.elexp.com/comp/16ifr.gif . Only difference is that my IF transformer is round as opposed to square Toko like shown in the link. I wish i had access to a pc, then i could upload an exact image.
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tekwiz
Posted: January 13, 2010 12:49 am
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In this case, the slug from any coil or IF transformer of similar appearance should fit. Consider buying a couple of IF trafos from a local supplier. These slugs are also found in most CRT televisions & consumer audio gear, so it shouldn't be too difficult to scrounge something up.
If you are really stuck, cover my postage costs & I'll mail you a few. I've got lots of them in my parts mine.


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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Damo666
Posted: January 13, 2010 06:49 pm
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QUOTE (tekwiz @ January 13, 2010 12:49 am)
In this case, the slug from any coil or IF transformer of similar appearance should fit. Consider buying a couple of IF trafos from a local supplier. These slugs are also found in most CRT televisions & consumer audio gear, so it shouldn't be too difficult to scrounge something up.
If you are really stuck, cover my postage costs & I'll mail you a few. I've got lots of them in my parts mine.

Cheers Tekwiz. I've already removed the slugs from a couple of the square IF transformers i have, and they're all about 1mm too large diameter wise. I've googled for endless hours in search of the round IF cans but i cannot find 'em anywhere. I'm beginning to lose all hope now.
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tekwiz
Posted: January 13, 2010 08:53 pm
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I guess I'll have to look, then. I have some already that are about a mm too small. rolleyes.gif


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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Damo666
Posted: January 13, 2010 10:17 pm
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That's appreciated. If you do manage to find one, please tell me what shipping cost(Uk) you require. I'll also give you extra for the component.
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tekwiz
Posted: January 13, 2010 10:42 pm
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QUOTE (Damo666 @ January 13, 2010 01:17 pm)
That's appreciated. If you do manage to find one, please tell me what shipping cost(Uk) you require. I'll also give you extra for the component.

Sure, I'll let you know. The slugs would fit in a standard letter, so that would cost me $2 to send to the UK from here in Canada. You might also be able to use a smaller diameter slug, by placing a stripped piece of wire insulation between slug & hole, to take up the diameter difference yet still allow adjustment. If you don't have smaller slugs, I know I do, even if I don't have the correct diameter.


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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Nothing40
Posted: January 13, 2010 10:54 pm
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QUOTE
You might also be able to use a smaller diameter slug, by placing a stripped piece of wire insulation between slug & hole, to take up the diameter difference yet still allow adjustment.


This just reminded me, A few times I've come across IF transformer cans that had a small rubber strip shoved into the hole with the slug..if you forget to replace the rubber strip (or it's missing),the slug seems to be too small for the hole,but with the rubber strip,it fits fine.
IIRC a CB radio was giving me a headache once because of that,and it took me a while to figure out. doh.gif


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Damo666
Posted: January 13, 2010 11:55 pm
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Yeah, that's true guys. Thinking about it, i've also seen the elastic string material used in the variable inductors around the rf output stages in various rigs. @Tekwiz - i guess 5mm or thereabouts would suffice then.
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tekwiz
Posted: January 13, 2010 11:58 pm
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QUOTE (Damo666 @ January 13, 2010 02:55 pm)
Yeah, that's true guys. Thinking about it, i've also seen the elastic string material used in the variable inductors around the rf output stages in various rigs. @Tekwiz - i guess 5mm or thereabouts would suffice then.

I know I have some that are just over 4.5mm. They are about 10mm long, but this shouldn't make any difference, as you can always leave some of the slug sticking out of the top of the coil. Think those would do you?


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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Damo666
Posted: January 15, 2010 01:25 am
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Yeah, they're worth trying Tek. How much do you want including postage buddy?
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tekwiz
Posted: January 15, 2010 01:38 am
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QUOTE (Damo666 @ January 14, 2010 04:25 pm)
Yeah, they're worth trying Tek. How much do you want including postage buddy?

Like I said, the postage will be ~$2. I am not worried about anything beyond that, so the choice is yours if you want to include a bit extra. I'll include an assortment of slugs, maybe half a dozen or so; as many different types as I have. I'll need your snail mail addy, & I have paypal. wink.gif


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Trouble rather the tiger in his lair, than the sage among his books.
For to you, kings & armies are things mighty & enduring.
To him, mere toys of the moment, to be overturned at the flick of a finger.

Fortuna favet fortibus.
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