[TenTec] Century 21 Replacement Drivers and Finals

[Al Gulseth]

Woody,

Since no one else has replied, I'll take a shot at answering your question. 
The following is from Motorola Application Note AN-593 "BROADBAND LINEAR 
POWER AMPLIFIERS USING PUSH-PULL TRANSISTORS" by Helge Granberg:

<snip> The exact amount of even-harmonic suppression available with push-pull 
stages is highly dependent on several factors, the most significant one being 
the matching between the two output devices. <snip>

I.e., proper transistor matching is a very important factor in generating a 
clean signal which meets FCC specs and doesn't put garbage on the airwaves.

73, Al

On Sun August 7 2016 9:40:40 pm Sherwood Demitz wrote:
> Many thanks to Dave Bowker, Mike Pagel and Steve Berg for pointing me in
> the right direction. My follow-up question is "how important is it that the
> transisters be matched pairs?"
>
>
>
> 73,
>
> Woody KO3S
>
>
>
> From: Sherwood Demitz [mailto:wdemitz at verizon.net]
> Sent: Sunday, August 07, 2016 12:12 PM
> To: tentec at contesting.com
> Cc: 'Woody Demitz' <wdemitz at verizon.net>
> Subject: Century 21 Replacement Drivers and Finals
>
>
>
> Greetings - Are there modern-day replacements for the Century 21 "MRF 472"
> PA drivers and the PA pair of "MRF 475"s?  I tried with Digikey and Newark,
> and drew the electronic equivalent of a blank stare from each.  Thanks in
> advance!
>
>
>
> Woody
>
> KO3S
>
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