[R-390] 600 to 8 ohm speaker converter

[Barry]

Or if you can even find a Radio Shack. 

Thanks, 
Barry - N4BUQ 

> From: "Bill" <bmarx at bellsouth.net>
> To: "Steve Toth" <stoth47 at yahoo.com>, "K PERALES" <kenperales at comcast.net>,
> "Barry" <n4buq at knology.net>
> Cc: "R-390 Mailing List" <r-390 at mailman.qth.net>
> Sent: Monday, February 14, 2022 3:08:57 PM
> Subject: Re: [R-390] 600 to 8 ohm speaker converter

> 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 [ mailto:n4buq at knology.net
>>> | <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" [ mailto:kenperales at comcast.net | <kenperales at comcast.net> ]
>>>> To: "R-390 Mailing List" [ mailto:R-390 at mailman.qth.net |
>>>> <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

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