Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+sb220\s+zener\s+diode\s+problems\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[Amps\]\s+sb220\s+zener\s+diode\s+problems\s*$/: 4 ]

Total 4 documents matching your query.

1. [Amps] sb220 zener diode problems (score: 1): Author: "almacottage" <almacottage@btopenworld.com>; Date: Fri, 8 Jul 2005 21:55:12 +0100; hi all. could someone give me some ideas on the problem i have encountered on one of my heathkit SB220 amps please . basically i swapped tubes last week from a pair of eimac to a pair of amperex 3-50; /archives//html/Amps/2005-07/msg00064.html (9,586 bytes)
2. Re: [Amps] sb220 zener diode problems (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Fri, 8 Jul 2005 14:50:22 -0700; Bad zeners typically measure under 0.1-ohms in both directions. My guess is that the arcing in the SB-220 is being caused by an intermittent parasite at c. 110MHz. Reducing the Q of the VHF suppresso; /archives//html/Amps/2005-07/msg00066.html (11,794 bytes)
3. Re: [Amps] sb220 zener diode problems (score: 1): Author: "Will Matney" <craxd@engineer.com>; Date: Fri, 08 Jul 2005 17:16:01 -0500; Ian, On receive, the cathode will have +120 Vdc applied to the cathodes through the C.T. of the heater transformer. On transmit, the C.T. of the heater transformer is connected to the 5.1 Vdc zener f; /archives//html/Amps/2005-07/msg00067.html (12,741 bytes)
4. [Amps] sb220 zener diode problems (score: 1): Author: R@contesting.com;Measures <r@somis.org>; Date: Sat, 9 Jul 2005 01:39:59 -0700; The cooling fan in a SB-220 directs high-velocity air at the filament pins. However, if the fan bearings are not periodically oiled, the cooling fan will slow and the solder will go. - notes - When s; /archives//html/Amps/2005-07/msg00074.html (14,365 bytes)

Current List: 1 - 4
Page: [1]