[Boatanchors] Need 4000/4(or 8) ohm audio transformer to use with aBC-324N

[Singley, Rodger]

John,

Until you find an audio matching transformer if you have a 6.3 volt filament transformer you will find it will probably work pretty well.  A 120V to 6.3V has around a 20 to 1 turns ratio and the impedance transformation ratio is the square of the turns ratio giving you a 400 to 1 impedance transformation ratio.  So an 8 ohm speaker on the 6.3 volt winding will appear as around 3200 ohms on the input side which is close enough for government work.  I have done this several times in the past with good success.

My daughter Anna (she will be 6 in October)is also getting a good immersion into vintage gear.  We are currently building a Heathkit digital thermometer I found still sealed in its original box at a hamfest earlier this year.  There is good hope for the future :)

Rodger WQ9E

-----Original Message-----
From: boatanchors-bounces at mailman.qth.net on behalf of John Flood
Sent: Tue 9/8/2009 11:52 AM
To: boatanchors at mailman.qth.net
Subject: [Boatanchors] Need 4000/4(or 8) ohm audio transformer to use with aBC-324N
 
Greetings all,

I rescued a pretty ugly BC-324N and have it running now.  Lucky most of the ugly was just dirt and the front panel cleaned up quite well!  but the case will need a repainting.  If I recall correctly, the speaker output is 4KOhm and was wondering if any one had a transformer hanging around so I could use 4-8 ohm speakers with it.  I could offer cash or even better, tested vacuum tubes in exchange.  Would be willing to offer 2-3 times worth of tubes in exchange but cash OK as well.  Also, if I am wrong with the output impeadance please let me know.  

I had my 6 year old Son listening to it on a pair of headphones and we found a Chineese broadcast and he got all excited and listened to it while he ate breakfast before school!  Looks like there is hope for #2 son and radio!  He was so excited It prevented me from harm by the wife for leaving it on the kitchen table the night(well morning) before when I crawled up to bed.

John Flood  KB1FQG
978-979-2807
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