Of course not. If someone wants to "see" the circuit cough up the cash. This
is not a welfare office for freeloaders.
Specs have been repeated many times on numerous reflectors for years. Go
find them.
Carl
KM1H
----- Original Message -----
From: "k7rdx" <k7rdx@charter.net>
To: "Tom Rauch" <w8ji@contesting.com>; <amps@contesting.com>
Sent: Tuesday, September 25, 2007 10:04 AM
Subject: Re: [Amps] 6 mtrs:
> Will the 6 meter guys publish some pics&specs for their work on the web?I
> want to see their work...No,I`m not interested in copying their
> designs...All this "Discussion" deserves some real show&tell...Jim K7RDX..
> ----- Original Message -----
> From: "Tom Rauch" <w8ji@contesting.com>
> To: <amps@contesting.com>
> Sent: Tuesday, September 25, 2007 5:06 AM
> Subject: Re: [Amps] 6 mtrs:
>
>
>> > On another note, Carl and I have seen many failed attempts
>> > to SB-200
>> > conversions to 6 meters and we have fixed them. Some
>> > people who can't seem to get
>> > it together with an Sb-200 conversion to 6 meters, cop out
>> > and say it can't be
>> > done or blame the tubes or some other lame excuses. Then
>> > go on to try and
>> > convince the masses that it is not a good item to buy. I
>> > am sure Carl and I
>> > can come up with hundreds of satisfied customers. Might I
>> > add W2CQM to the
>> > list.
>>
>> It could be you are doing enough wrong that it works, and
>> they are doing so much right it doesn't work.
>>
>> That's what happens when we use a device in a region where
>> it is unstable.
>>
>> The problem comes in when we inflate ourselves and be openly
>> critical of others when we really succeeded through luck.
>>
>> Here is the test.....
>>
>> Take a pair of 572B's and put them in a near-perfect layout
>> with very short grid leads, a very short anode path to the
>> tank, and good shielding.
>>
>> Does it dip in the center of the RF power peak?
>>
>> Is it unconditionally stable for all tuning conditions?
>>
>> The answer above about 15MHz with the 572B in a pair is NO.
>> As a matter of fact a well shielded design will oscillate if
>> lightly loaded at full anode voltage. It will also NEVER
>> have the output peak anywhere close to minimum anode
>> current.
>>
>> Now if we go higher, especially in a much less than perfect
>> layout, we can find frequency bands of stability. The
>> problem is when we credit our accident to great skill and
>> ability and heap tons of bad verbiage on others because they
>> had what really amounts to bad luck, or we start saying the
>> tube manufacturer is wrong.
>>
>> Rejoice in the fact you have found a good recipe, but let's
>> not slam others who very likely could be just as
>> knowledgeable or more knowledgeable than you or Carl. They
>> just might not be as lucky as you two.
>>
>> 73 Tom
>>
>>
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>> http://lists.contesting.com/mailman/listinfo/amps
>
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