[R-390] 600 to 8 ohm speaker converter

[Bill]

Here's an old post...gosh it's been over 20 years...I have a lot of the 
old emails with a variety of solutions...I doubt the price is the same 
hi Or if it's still available...

/I have been using Radio Shack part number 32-1031B successfully for 
about two years on my Collins R-390A. The transformer will handle from 
.62 to 10 watts of audio with taps for 4, 8 and 16 ohms impedance. Seems 
like the price was in the $7 or $8.00 range./

Bill W2CQ

On 2/14/2022 3:58 PM, Bill wrote:
> As I recall you can also use the old tv transformer that was used used 
> to transition the back of the TV to coax...that was from Glen Zook 
> K9STH(SK). It's probably in the archives somewhere...also mentioned 
> were the Radio Shack Audio transformers...
> Bill W2CQ
>
>
> On 2/14/2022 2:26 PM, Steve Toth via R-390 wrote:
>> AND IIRC there is the junk box solution: if you really need a quick working low-buck fix and can't find the correct parts, you can use a 115v to 12.6v filament transformer to connect the 600ohm output impedance to the 8ohm speaker.
>> - Steve  W7SJT
>> "Always look for a positive solution then Improvise, Adapt, and Overcome"
>>
>> - adaptation of the U.S. Marine Corps motto
>>
>> "Every day is an opportunity to challenge the achievement of your dreams"
>>
>>
>> "Success is not final, failure is not fatal.  It is the courage to continue that counts."
>>
>>
>> - Winston Churchill
>>
>>
>>
>>
>> On Monday, February 14, 2022, 12:17:07 PM MST, Barry<n4buq at knology.net>  wrote:
>>
>>   If I remember correctly, a 70 volt line speaker transformer can be used and I think that's what you're showing on the left.  An 8-ohm speaker goes to the 8-ohm output lines and the line output goes to one of the wattage taps.  I can't see the labeling on the back side of the transformer in you picture so not sure which wires those are but typically there would be one common input with multiple taps for various wattage (or volts).  As I recall, there is a recommended tap to use but I think I tried a few of them to see which one gave the best output.
>>
>> HTH,
>>
>> Thanks,
>> Barry - N4BUQ
>>
>> ----- Original Message -----
>>> From: "K PERALES"<kenperales at comcast.net>
>>> To: "R-390 Mailing List"<R-390 at mailman.qth.net>
>>> Sent: Monday, February 14, 2022 12:49:17 PM
>>> Subject: [R-390] 600 to 8 ohm speaker converter
>>> When I got my R-390 it has what I assume to be some kind of transformers to
>>> allow a modern 8ohm speaker to be hooked up.  I did not think to diagram how
>>> the wires were hooked up.  Is there any manual that tells a non-electrician how
>>> to connect these transformers to the R-390A to let me listen without
>>> headphones.
>>>
>>> Ken
>>>
>>>
>>> ______________________________________________________________
>>> R-390 mailing list
>>> Home:http://mailman.qth.net/mailman/listinfo/r-390
>>> Help:http://mailman.qth.net/mmfaq.htm
>>> Post:mailto:R-390 at mailman.qth.net
>>>
>>> This list hosted by:http://www.qsl.net
>>> Please help support this email list:http://www.qsl.net/donate.html
>> ______________________________________________________________
>> R-390 mailing list
>> Home:http://mailman.qth.net/mailman/listinfo/r-390
>> Help:http://mailman.qth.net/mmfaq.htm
>> Post:mailto:R-390 at mailman.qth.net
>>
>> This list hosted by:http://www.qsl.net
>> Please help support this email list:http://www.qsl.net/donate.html
>>    
>> ______________________________________________________________
>> R-390 mailing list
>> Home:http://mailman.qth.net/mailman/listinfo/r-390
>> Help:http://mailman.qth.net/mmfaq.htm
>> Post:mailto:R-390 at mailman.qth.net
>>
>> This list hosted by:http://www.qsl.net
>> Please help support this email list:http://www.qsl.net/donate.html
>