[Drake] AC4 ripple

[Larry Taft]

Steve, your numbers sound good based on  my measurements of the AC-4.  
Check the bias ripple also, it should be a low value like the 250 supply.

73, Larry  K2LT
drakerepair.com      800-687-9161

Steve wrote:
> I have just finished installing the Heathkit Shop AC4R replacement 
> power supply board in my AC4 power supply.
>
> Was just wondering if anyone has measured ripple on the HV outputs?
>
> Here's what I'm seeing: keydown, about 250mA plate current, using a 
> Fluke 8060A DMM and Tektronix 2235 scope:
>
> 650 volt output: 659VDC, 20 volt peak-to-peak positive going sawtooth, 
> 60Hz
>
> 250 volt output: 249VDC, 1.75 volt peak-to-peak positive half sine 
> waves adjacent to each other, 120Hz
>
> The measurements of those outputs with the old capacitors were about 
> 25 volts p-p on both of them, so I've certainly helped the 250VDC 
> output a lot.
>
> But what about the 650VDC output? Does ripple in the 20 volt p-p range 
> sound right?
>
> Thanks.
>
> Steve K8JQ
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