>I took possession of two brand new boxed EIMAC 4-500 tubes today.
>For those interested the specs I could find :
>Dissipation (500 watts)
>Filament Voltage (10.0 +/- 0.5 V)
>Current @ 10 V (10.2 A)
>Amplification factor (5.5)
>Cin (15.0 pF)
>Cout (5.0 pF)
>Cpb (0.15 pF)
>Frequency of maximum rating (110 MHz)
>Now I am curious why the 4-400A is so well utilised but I have never seen
>the 4-500A being used in projects ..why ?
>The 4-500A looks like a better choice than the 4-400A but is not even listed
>in the ARRL handbooks ?
>Other than changing the filament voltages how any ideas how it will perform
>as a straight replacement in my current 4-400 A amps.
The additional peak emission should make c. 20% more PEP than 4-400s..
- R. L. Measures, 805.386.3734, AG6K, www.vcnet.com/measures.
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