[TenTec] Re(Ten Tec) In praise of older technology

[Bob McGraw - K4TAX]

Are we speaking of Class C amplifiers or linear amplifiers operating in 
Class AB1 or Class AB2?  In a Class C amplifier the input power or grid 
drive does not appear as part of the output power.  In a grounded grid 
linear amplifer the input or drive power does appear as part of the output 
power.  There is a difference.

73
Bob, K4TAX



----- Original Message ----- 
From: "Brian Carling" <bcarling at cfl.rr.com>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Sunday, March 02, 2014 11:40 AM
Subject: Re: [TenTec] Re(Ten Tec) In praise of older technology


> My 422 Centurion manual has very adequate instructions for tuning, and 
> that is what I go by.
>
> Best regards - Bry Carling
>
>
>
>> On Mar 2, 2014, at 12:38 PM, JAMES HANLON <knjhanlon at msn.com> wrote:
>>
>> On the question of tuning for Dip versus tuning for maximum output, let 
>> me offer a few words of, I hope, wisdom.
>>
>> First, the additional amount of power output that might be obtained by 
>> operating the rig "off dip" is so little that it will make absolutely no 
>> difference at the receiving end.
>>
>> Second, you are very likely increasing the total amount of power 
>> dissipated in the final amplifier tubes by operating "off dip," and you 
>> are pulling more current from the tube cathodes as well.  Both will 
>> contribute to degrading the amplifier tubes' life.  Considering what 
>> replacement tubes cost these days, you probably don't want to shorten the 
>> life of your existing tubes in order to get a few watts more output from 
>> them.
>>
>> You would probably be better advised to run the amplifier at somewhat 
>> less than full, ICAS class C ratings, that is to back off the fully 
>> loaded plate current a bit.  You would lose at most one or two dB on the 
>> other fellow's S-meter, and you would add considerably to the life of 
>> your tubes.
>>
>> Jim Hanlon, W8KGI
>>
>> _______________________________________________
>> TenTec mailing list
>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
> _______________________________________________
> TenTec mailing list
> TenTec at contesting.com
> http://lists.contesting.com/mailman/listinfo/tentec
>