- 1. [Amps] 8877 hipot (score: 1)
- Author: "k7rdx" <k7rdx@charter.net>
- Date: Wed, 11 Oct 2006 06:29:31 -0700
- I just bought a 8877 on Ebay advertised as new...I just tested it on my hipot and found it draws 40 microamps(Cold) at 4000vdc...Comments from amps guys? Guy says to return and he`ll refund my money
- /archives//html/Amps/2006-10/msg00078.html (6,189 bytes)
- 2. Re: [Amps] 8877 hipot (score: 1)
- Author: "Tom W8JI" <w8ji@w8ji.com>
- Date: Wed, 11 Oct 2006 12:21:40 -0400
- Jim, I assume you have a dc highpot. Why don't you run the filament (with airflow) for a few hours and see how the tube tests? The good 8877's I test hold off about 12-15kV from anode to grid before
- /archives//html/Amps/2006-10/msg00079.html (7,022 bytes)
- 3. Re: [Amps] 8877 HIPOT (score: 1)
- Author: "Paul Marbourg" <zborg@comcast.net>
- Date: Wed, 11 Oct 2006 12:20:43 -0700
- Hi Jim, Make sure the DUT has been properly degreased before deciding it has failed the hipot test. Finger grease residue on the 8877's ceramic can easily allow 40 microamps to flow externally at 400
- /archives//html/Amps/2006-10/msg00080.html (6,872 bytes)
- 4. Re: [Amps] 8877 hipot (score: 1)
- Author: TexasRF@aol.com
- Date: Thu, 12 Oct 2006 12:32:51 EDT
- Hi All, A couple of years ago a friend gave me a never used still in the box 8877 with a date code from the late 80's. A quick check showed internal leakage starting with only 1600vdc with the tube c
- /archives//html/Amps/2006-10/msg00090.html (8,294 bytes)
- 5. Re: [Amps] 8877 hipot (score: 1)
- Author: "Will Matney" <craxd1@verizon.net>
- Date: Thu, 12 Oct 2006 13:40:19 -0400
- One thing that could possible cause a false reading is the exterior of the tube to be dirty, especially where the ceramic to metal fits. I'd give it a good cleaning and then check it. Best, Will ** R
- /archives//html/Amps/2006-10/msg00093.html (9,530 bytes)
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