Re: {Chrysler 300} slippage in radio tuning - An easy cure

[John Grady <jkg@xxxxxxxxxxxxxxxxx>]

hi , 
the search tune never really works right , unfortunately. 
And the motor reversing switch   always fails by breaking off a contact, or the little piece of phenolic in it dries out and crumbles  . 
This one ( dormant 20+ years)searched  3 x and then that motor switch failed right on the bench . , pile of little bits  under it 
I once made an electronic flip flop circuit to reverse the motor ( lot of time  and effort ) with a relay , that part of it worked , but ability to stop on stations was just plain  marginal , unless 5 miles from station . Tubes are almost never bad.. this one had originals all perfect. 
 
The last 3-4 i just disconnect the initiating motor switch wire selection at front switch, — as when motor wont go , and  someone pushes local or dist switch it locks into search mode but it cant search , —- only way to unlock that  is turn it off and on again . Also electric  clutch fails , motor spins , no drive . 

The 7 button radio itself is terrific, very surprised and pleased that57 by Philco  was hand wired no pc card . Later with pc  card( 300F)  the traces lift with any heat , makes repair very difficult sometimes impossible . 
So , ymmv, —- but to me having a really good am radio without power tune that does not lock itself up is better than alternative .  

I once fixed a delco search tune in a 60 buick convert I have — they work a lot better on search tune . No motor , a spring pulls it , solenoid resets it 

7 button is a much better radio inside than 5 button , FYI , especially the one with two output transistors . By the way you can buy them again , 2N401 , sometimes  have to mess  with bias resistors . ( too long for  here) . 

The one I am working on ( early C ) has a one transistor output , power tune , never saw that before . Transistor was bad .     

I may put something up on disabling that power tune lock in ..  not advocating , just a choice to make 
I know how you feel ,— it  becomes  an aggravation rather than feature , especially once complicated “ flip over” motor reversing switch fails 
And for sure it will .. 
I admit that decision driven by hassle to get the radio out of an F (!) yet again ! 
john 
> On Dec 12, 2024, at 9:50 AM, JOHN GUARNERI <mguarneri@xxxxxxx> wrote:
> 
> John, on my 61 the seek scan works, however whether it is local or distance will not lock any station.  Any thoughts on this?
> Sent from my iPhone
> 
>> On Dec 12, 2024, at 9:38 AM, John Grady <jkg@xxxxxxxxxxxxxxxxx> wrote:
>> 
>> hi,
>> see spring added to 57 300 radio , same basic design in all radios
>> this adds more squeeze to tubber faced clutch , avoids slipping .
>> The clutch is there to disconnect tuner  from tuning knob friction when you use push buttons . rubber gets old , slips .
>> —on 57 I drill hole on left side make a little hook of copper wire , solder to case ,big iron —  later have many  holes already   .a dab of adhesive keeps spring in place after hooking over near 90 degree bend .
>> Dont overdo it ,makes push buttins too hard to push .
>> See spring scale , about 1/8”diameter  fine wire .
>> dont be tempted to oil anything near clutch , it gets on it , it is toast . And it will .
>> a drop of oil on each pushbutton setting slide lock can be helpful
>> 
>> sometimes rubber breaks free of metal , hold clutch open get behind rubber disc  with toothpick and weather strip adhesive fixes that   , you can barely see adhesive at edge of this one
>> fixes common pia!
>> 
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