Good answers.
Question on #2 below: Is the power transformer in the SB-220 conservatively
rated, as the one in the SB-200 is?
Some hams have replaced the 572-Bs with GI-7BTs, and the SB-200's
transformer handled the ~50% increase in power output. And I do believe
that the SB-220's is considerably beefier than the Drake L-4B's.
Just curious.
73, Mike
www.w0btu.com
This is like swapping engines in a car. It sounds simple but is fraught
> with problems.
>
> 1. Input Z of 8877 is different requiring rebuilding of input circuits.
> 2. Power transformer will not handle increased requirement of more
> powerful tube.
> 3. Completely new pressurized cooling system needed.
> 4. Output circuit might not handle increased power.
> 5. ad infinitum
>
> Making a change like this is not for the inexperienced and if you are
>> unsure about it, you should probably find an Elmer to help you.
>>
>
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