[Hammarlund] Re 600ohms audio output

rbethman rbethman at comcast.net
Tue Feb 2 16:06:05 EST 2010


Yep!  And Rat Shack stopped selling them some number of years ago.

The center tapped filament transformer will work just fine.  Make it a 
12.6VAC one and have a ball!

Bob - N0DGN

kirklandb at sympatico.ca wrote:
> I believe it is a 70V (or 70.7V) line matching transformer.
> They generally indicate an input wattage, and an output impedance, e.g. 4, 8 ohms.
>
>   
>> Date: Tue, 2 Feb 2010 14:19:20 -0600
>> From: n0jmy at hayseedhamfest.com
>> To: hammarlund at mailman.qth.net; Glowbugs at piobaire.mines.uidaho.edu
>> Subject: Re: [Hammarlund] Re 600ohms audio output
>>
>> I had a SP-600 years ago and I remember you could easily match (within 
>> reason) its 600 ohm output to to a 8 ohm speaker.  You just used a 
>> cheap-o Radio Shack or whatever filament transformer.  One of those 
>> about an inch and a half square jobs.
>>
>> It was either 6.3 or 12.6 on the secondary but I can't remember which... 
>> and I can't remember the formula.
>>
>> Anybody out there lend a hand?
>>
>> 73,
>> Tom



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