[ARC5] Audio power output and BFO fixed - 10 meter BC-454

[Kenneth G. Gordon]

On 18 Feb 2013 at 19:04, Ian Wilson wrote:

> The 12A6 data is given for 250V on plate and screen, and a total of
> about 35mA plate+screen current. The grid bias is -12.5V, which means
> a cathode resistor of about 360 ohm. However, the cathode resistor in
> these receivers is much higher than this.

In fact, it is 1500 ohms.

> So the typical conditions in
> the data sheets - including power output at some specified load
> resistance - don't apply here.
> 
> Ken - perhaps you could measure the voltage across the primary and the
> corresponding voltage across the secondary for a sine wave signal with
> no load (for a small input signal). That would provide the turns
> ratio.

The output transformer is a standard one from (I think) and R-23/ARC-5

I'll do that asap.

Ken W7EKB