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I dont think you are in his group?? He has been selling and testing these for 4 years now.? ? Since you might not be in there, I can post the Hi pot data here:
"These tubes all tested good, 24 out of 24. The highest high pot anode to grid was 15 kV, the lowest was 11 kV.
The highest grid current for emission saturation at 2800V anode was 190 mA, the lowest 170 mA. The lowest peak output at emission limiting at 2800V was 1050W at 5V filament, the highest was 1200 W.
Grid high pots were 1500-5000V at 10uA leakage, with most around 2000V. The 5kV tubes had ~15 kV anode. They must have a really hard vacuum."
From: [email protected] <[email protected]> on behalf of Jim VE7RF via groups.io <jim.thom@...>
Sent: Wednesday, May 22, 2024 7:17 AM To: [email protected] <[email protected]> Subject: Re: [ham-amplifiers] 3-500 tubes ?
On Tue, May 21, 2024 at 05:54 PM, W7WRX wrote:
##? Test any chinese 3-500Z? with a hi-pot tester.? You won't measure? 5 kv? between grid and cathode....like you see on any Eimac 3-500Z.? ? The best you will measure is 1 kv, if that....and sometimes as low as 600-700v.? ##? You won't measure 16-18KV,? from anode to grid, like on any Eimac 3-500Z.? ##? The measured C? between grid and cathode on the chinese 3-500Z's is far more than an eimac.? ?The chinese tubes have the grid spaced closer to the cathode vs? Eimac.? ?The MU on the chinese tubes is 200.? The MU on the eimac 3-500Z is just 130.? The chinese? 3-500Z's? will work fine.... as long as they have the white base...and are matched correctly, if a 2 x tube amp used.? On eimac 3-500Z's.... grab any random pair of new eimac 3-500Z's.... and they are matched up.... since they were? built to exact specs.?? |
