[Amps] Alpha 9500 Idling Current

[Alek Petkovic]

So, what's the deal here?

We have heard from several owners now and from the people who make the 
amps and all the idling currents are wildly different.

Are they coming out of the factory like this or do things change with use?

Whatever the case, it seems to be a pretty silly design error, not to 
have it easily adjustable by the user.

FAIL Alpha. :-)

73, Alek.
VK6APK

On 30/12/2016 6:32 AM, Fern Rivard wrote:
> Well that’s strange Brad as Glenn AE0Q at Alpha RF Systems told me that it should be 130 ma but I suppose that 10 or 20 ma won’t make that much difference?
> Is it possible for you to guide us to set the bias using the software?
> 73 from Fern  VE7GZ
>
>
> -----Original Message-----
> From: BRADLEY FOCKEN
> Sent: Thursday, December 29, 2016 2:28 PM
> To: Bill Turner ; Amps group
> Subject: Re: [Amps] Alpha 9500 Idling Current
>
> Hello all.
> The plate current should be set to 150ma with no rf plus or minus 10ma. 150 is your target bias.
> 83 Brad K0HM
>
>
>
> Sent from my Verizon 4G LTE smartphone
>
>
> -------- Original message --------
> From: Bill Turner<dezrat at outlook.com>
> Date: 12/29/16 2:23 PM (GMT-07:00)
> To: Amps group<amps at contesting.com>
> Subject: Re: [Amps] Alpha 9500 Idling Current
>
> ------------ ORIGINAL MESSAGE ------------(may be snipped)
>
> On Thu, 29 Dec 2016 13:35:12 -0500, Paul wrote:
>
>    
>> That amount of Ip idle current seems high to me for the 9500.  Possibly
>> W6WRT and W8ZR can weigh-in with their findings.  Possibly, it was set
>> higher in software?
>>      
> REPLY:
>
> My 9500 idles at 76 mA with 3620 VDC on the plate.
>
> It was built in October 2014 but since I am the second owner I don't
> know if the tube is still the original or not. Most likely it is.
>
> 73, Bill W6WRT
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