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## [AMPS] 3-500Z amplifiers and grid current

 To: [AMPS] 3-500Z amplifiers and grid current m.j.willis@rl.ac.uk (Mike Willis) Mon, 16 Mar 1998 11:22:13 +0000
 ```How does one estimate the grid dissipation in valves like the 3-500Z, 3CX800 etc. DC Volts x DC amps is simple, RMS volts and RMS current also easy. But what about RF losses? Say I have 50W input to a 5-300Z on 6m, cathode biased to 5V 3kV EHT at 400mA and 130mA grid current. What is the grid dissipation? I know it is not 50W, but it has to be more than the 7W I calculated. Say there is 200mA of grid current during tune up. How long can that situation continue before damage occurs? -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm ```
 Current Thread [AMPS] Tuning of amps - 3cx800s,etc.., KA2YKC [AMPS] Tuning of amps - 3cx800s,etc.., Mark S Graalman [AMPS] Tuning of amps - 3cx800s,etc.., km1h @ juno.com [AMPS] Tuning of amps - 3cx800s,etc.., Rich Measures [AMPS] Tuning of amps - 3cx800s,etc.., Rich Measures [AMPS] Tuning of amps - 3cx800s,etc.., km1h @ juno.com [AMPS] Tuning of amps - 3cx800s,etc.., Rich Measures [AMPS] Tuning of amps - 3cx800s,etc.., km1h @ juno.com [AMPS] Tuning of amps - 3cx800s,etc.., Rich Measures [AMPS] 3-500Z amplifiers and grid current, Mike Willis <=