[Amps] Supply question

[Carl]

----- Original Message ----- 
From: "Gary Schafer" <garyschafer at comcast.net>
To: "'Rob Atkinson'" <ranchorobbo at gmail.com>; <amps at contesting.com>
Sent: Wednesday, July 20, 2011 12:01 PM
Subject: Re: [Amps] Supply question


> With 3500 volts @ 890 watts PEP out per tube 3rd order IM products are -40
> db with respect to one of two tones. That's -46 db the way radio
> manufacturers spec IM. Pretty darn good!
> At 2500 volts 3rd order IM is -33db. Per Eimac spec sheet. Much better 
> than
> most radios today.
>
> 73
> Gary  K4FMX


Thats at zero bias. Add 5.1V as in the SB-220 and its in the low -40's which 
is what you will actually hear on the air and not equipment manufacturers 
fudged figures.

Carl
KM1H



>
>> -----Original Message-----
>> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com]
>> On Behalf Of Rob Atkinson
>> Sent: Wednesday, July 20, 2011 11:16 AM
>> To: amps at contesting.com
>> Subject: Re: [Amps] Supply question
>>
>> I understand that with 3-500 the 3rd order IMD gets pretty lousy when
>> the Ep gets up there much above 3 KV.
>>
>> I also had some idea you get a much bigger chance of arcs in the tube
>> if you push the Ep way up there near the limit.
>>
>> comments?
>>
>> 73
>>
>> Rob
>> K5UJ
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