>
>The argument that "if it was a great circuit, all of the amplifier companies
>would be using it" is not a satisfactory answer. The Wright canard style
>aircraft has much to offer over a standard aircraft design - including stall
>characteristics. Yet they are not sold commercially - mainly because they
>are different. The Tucker automobile did not sell well, mainly because of
>fear raised by others.
>
>The DAF circuit is certainly not for everyone. Like any other amplifier, it
>can be operated under conditions that splatter. It may require more care
>and understanding on the part of the operator and it probably is limited to
>certain tubes.
>
>It seems that a number of operators in Sweden have built them and are using
>them daily on the air. That these operators still support the design is
>strong evidence that the amplifier must not splatter in actual operation.
? There has never been an amplifier that did not splatter in actual
operation. The question is how much?
>If they splattered as badly as a few said, these Swedes would not be talking
>to each other - and there would be a group waiting in line to tell the
>entire world "the truth".
? the writing is on the wall.
>
>More testing should be presented, but I expect that no amount of evidence
>will convince certain doubters.
? the 3/2 power law is too well established.
>
>I have the same problem when I tell amateurs that the final stage of one of
>my homebuilt transmitters is a 5U4. Some guys tell me it cannot be done.
>Yet it works well and the radiated signal does not care. Sometimes doing
>things differently is not all bad - although it does sometimes become more
>than a little amusing when someone interrupts you doing something by
>breaking in and telling you it cannot be done.
>
? The DAF amplifier Can be done. Total distortion is roughly 1%.
According to FCC rules, this is perfectly legal as long as one stays
roughly 25KHz away from amateur service band edges. // When measuring
distortion, Rich does not break in and make a statement about any
amplifier configuration. . Instead, I ask the (scatological) operator
if he would like to know what his distortion level measures at my
location. If he says no, I go.
cheers
- Rich..., 805.386.3734, www.vcnet.com/measures.
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