[Boatanchors] SX-28 Question

[Richard W. Solomon]

The parts and wiring all look old enough to be of the same vintage and the
solder connections look just like all the others.
If the Tone Control and AF Control were replaced it was early on in it's
life.
Since they seem to work OK, I see no reason to replace them, I plan to use
this radio not stick it up on a museum shelf !!

Thanks for the replies,

73, Dick, W1KSZ

-----Original Message-----
>From: rrkrr <rrkrr at comcast.net>
>Sent: Sep 26, 2008 5:36 AM
>To: "Richard W. Solomon" <w1ksz at earthlink.net>
>Cc: boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] SX-28 Question
>
>Richard,
>I'm guessing, but I think it's likely that the tone control
>potentiometer on your radio has been replaced.
>
>I had the same issue when restoring an SX-17:  the power switch was on
>the tone control, and the tone control was scratchy and needed a new
>pot.  I quickly learned that it is almost impossible to find a linear
>taper pot with a switch on it these days.  The great majority of pots
>assembled with switches are log taper, which is used on volume control
>pots because of the logarithmic loudness response of human hearing.  I
>think it's likely that the person that replaced the tone control on your
>SX-28 found the same thing, and so bought new pots for both tone and
>volume and moved the switch wiring to the volume control.
>
>More recently, I have learned that Radio Daze (and probably others) sell
>various values of linear and log taper pots that will accept switches,
>which they sell separately.
>
>Bob
>K4ERR
>
>
>Richard W. Solomon wrote:
>> Looking in the SX-28 Manual it says the AC On-Off Switch is located on the Tone Control.
>> Not in my SX-28. It is on the AF Control. The Front Panel has AC On engraved by the 
>> ToneControl but the Tone Switch looks like original equipment.
>> Everything I can find says it's an SX-28 (round coil forms, not square, etc). 
>> Maybe I have an offshoot that was done between the SX-28 and the SX-28A ?? 
>>
>> Any ideas ? 
>>
>> 73, Dick, W1KSZ
>> _______________________________________________
>>
>>   
>