looking for a channel selector

[cameronfby]

Hey there,

Looking for some advice on locating a new channel selector switch for a Cobra 139xlr.

The switch is a Pulser sr-157.

thanks

 

[nomadradio]

Not so different from seeking a new door handle for a 45 year-old car. It's a dealer part, but the dealer no longer stocks it.

That selector was used in a half-dozen brands that hired Uniden to make their 1978 SSB CB radios. A used one is probably your only hope. Biggest aggravation with that one is the flat cable that connects the channel selector/display board to the main circuit board. Fragile and annoying to repair.

Didn't turn one up on fleabay.

73

 

[DelR]

I need a LSB/AM/USB switch for my Cobra 139xlr, Know anything about that one??

 

[9C1Driver]

Barkett Electronics

stores.goldeneagleradios.com

This used to be a go to place for old parts. Not sure what stock is left since covid ruined everything.

 

[DelR]

Barkett Electronics

stores.goldeneagleradios.com

This used to be a go to place for old parts. Not sure what stock is left since covid ruined everything.

Nice site, but no luck on my part. Thanks for the link...

 

[nomadradio]

The XLR series radios date to 1978. Not so different from needing a part for a 1978 car. The dealer won't be any help.

Make sure you replace C179. It shorts and damages the relay. Might also clobber the circuit in the mode switch that feeds the final and driver stages.

We found a fleabay dealer in Taiwan that has similar rotary switches. The numbering of the pins will probably be different. I'll fetch the info from work and check back in tomorrow.

73

 

[nomadradio]

The switch we would use is made by Alps. A single deck has four circuits. The 139XLR schemo shows at least 5 sections in the mode selector.

Here's a fleabay link to the 8-pole version Has two decks of four circuits each.

https://www.ebay.com/itm/1441452140...pid=5336136228&customid=&toolid=10001&mkevt=1

That one has a 20 mm long shaft. The same switch with a longer 25mm shaft has the same part number. Go figure.

https://www.ebay.com/itm/1338427251...pid=5336136228&customid=&toolid=10001&mkevt=1

Pretty sure the first number with the short shaft is what your radio needs.

Tricky part comes when the numbers on the lugs won't match from the old selector to the new one.

The Alps pin numbers are below. Best of luck.

73

 

[DelR]

The switch we would use is made by Alps. A single deck has four circuits. The 139XLR schemo shows at least 5 sections in the mode selector.

Here's a fleabay link to the 8-pole version Has two decks of four circuits each.

https://www.ebay.com/itm/1441452140...pid=5336136228&customid=&toolid=10001&mkevt=1

That one has a 20 mm long shaft. The same switch with a longer 25mm shaft has the same part number. Go figure.

https://www.ebay.com/itm/1338427251...pid=5336136228&customid=&toolid=10001&mkevt=1

Pretty sure the first number with the short shaft is what your radio needs.

Tricky part comes when the numbers on the lugs won't match from the old selector to the new one.

The Alps pin numbers are below. Best of luck.

73

Thanks, I will give it a shot...