>
>
>
>On Thu, 17 Dec 1998 16:25:34 -0800 Rich Measures <measures@vc.net>
>writes:
>
>
>SNIPPED
>
>
>>>No criticism of Rich's particular design; the limitation is in the
>>tubes
>>>themselves.
>>>
>>Ä Did you perhaps presume that the 7580 has the same power capability
>>as
>>a 4CX250B?
>
Carl Heuther, NJ1H, wrote:
>Presumption or fact Rich? Yes the 250R and 7580 ( not exactly the same
>tube either) have somewhat different specs than the 250B , but they
>still have identical cathode emission.
? According to Eimac's Technical Data (6-16-61): "The 4CX250R will
deliver more output power in most linear amplifiers which presently
employ the 4X250B or 4CX250B ... ... ...".
Carl: How can "more output power" be obtained if the B and R versions
"have identical cathode emission"?
- The constant current curves unsurprisingly shows that the R version
has a higher peak current ability than the B version. However, 'more
output power' is realizeable only when sufficient screen-potential is
used.
- later, Carl
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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