[ARC5] Line-transformers to replace shot audio transformers.

[Phillip Carpenter]

Hammond makes a series of miniature potted audio transformers. They are probably small enough to fit inside the original transformer housing. They are approximately 1" X 1.25".

Two are available, the 109L and 108N. One is 10K to 3.2, the other is 10K to 600. They are both rated at 2 watts. Like all Hammond transformers they are somewhat expensive at about $20 each.

But being a onetime cost might be worth it if your trying to have that stock look.

Respectfully,

Phillip

Sent from my iPhone

> On Sep 29, 2016, at 11:21 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:
> 
>> On 29 Sep 2016 at 20:10, Dennis Monticelli wrote:
>> 
>> Good finds, Ken.  
> 
> Thanks, Dennis.
> 
>> Line transformers have no flux gap.  They are not designed to pass DC so saturation can be a 
>> concern.
> 
> Yes. Mike Murphy's article in Nov 2007 ER Mag on these makes that point.
> 
>>   However, a 5W or 10W line transformer should be OK passing the modest Class A 
>> bias current of a command receiver.
> 
> Well, the one I had to use works very well indeed. I used one of those Radio Shack jobs in a 
> wrecked BC-453 and it sounds very good.
> 
> I might add that the line transformer needs a 0.625 Watt tap (which is a common tap, BTW) 
> for 8K. The 0.5 watt tap gives around 10K and the 1 watt tap gives about 5 K. The 10K tap 
> should work OK, but the 5K tap won't work very well with a 12A6.
> 
> The taps are all listed in watts, but since the transformer is a 70.7 V job, R = E^2/P
> 
> Ken W7EKB
> 
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