[ARC5] Audio power output - 10 meter BC-454

[Kenneth G. Gordon]

On 19 Feb 2013 at 16:41, Neil wrote:

> I think Ken, you're operating the receiver into a 500 ohm loudspeaker
> which you have described as being in reality an 8 ohm speaker with
> 500:8 matching transformer.
> The load presented may not represent 500 ohms at your 400 Hz test
> frequency,

Yes. I had thought of that too.

> explaining the very wide plate voltage swing calculated by
> Brian. It would perhaps be more appropriate to use a resistor of 500
> ohms.

OK. I have several of those around here somewhere.

However, I am not even certain what the actual output impedance of this particular 
transformer really is.

It may be 300 ohms, it may be 600 ohms, or something even different from that.

As soon as I can do it, at least I can get a better idea of what the real turns ratio is.

It IS a stock ARC-5 ouitput transformer though.

Ken W7EKB