[R-390] 600 to 8 ohm speaker converter

joldenburg2 at new.rr.com joldenburg2 at new.rr.com
Mon Feb 14 18:33:56 EST 2022 

70V 15W Line Matching Transformer 844632014437 | eBay [1]

Jon AB9AH

	-----------------------------------------From: "Barry" 
To: "Bill"
Cc: "R-390 Mailing List"
Sent: Monday February 14 2022 3:11:27PM
Subject: Re: [R-390] 600 to 8 ohm speaker converter

 Or if you can even find a Radio Shack.

 Thanks,
 Barry - N4BUQ

 > From: "Bill" 
 > To: "Steve Toth" , "K PERALES" ,
 > "Barry" 
 > Cc: "R-390 Mailing List" 
 > 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
 >>> |  ] 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 |  ]
 >>>> To: "R-390 Mailing List" [ mailto: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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