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Philco 89B headaches
#8

(01-07-2016, 09:12 PM)sparkydave Wrote:  Well, I took the coil out, baked it, checked resistances, and - no change.  I took a look at voltages, and found I have about 200 volts on the plate, and about 126 volts on grid #2.  Interesting, since the RCA tube data book shows 90 max for grid #2.  Is there a voltage chart of what I should be seeing available?  I re-tested my 36 tube, and I must have been mistaken, the emission test looks good.

Don't you have to bake the coil before you rewind it? Not sure if it will help after it is rewound... maybe someone can clarify this. Also, are you using a dmm for the voltage measurements? As I understand it the voltages will be a bit higher than what they say if using a dmm instead of the old meters they used back then.


Messages In This Thread
Philco 89B headaches - by sparkydave - 12-22-2015, 06:35 PM
RE: Philco 89B headaches - by Ron Ramirez - 12-22-2015, 08:23 PM
RE: Philco 89B headaches - by markmokris - 12-27-2015, 12:41 PM
RE: Philco 89B headaches - by sparkydave - 01-04-2016, 08:59 PM
RE: Philco 89B headaches - by Phlogiston - 01-05-2016, 04:16 PM
RE: Philco 89B headaches - by sparkydave - 01-07-2016, 09:12 PM
RE: Philco 89B headaches - by Warren - 01-08-2016, 05:21 PM
RE: Philco 89B headaches - by klondike98 - 01-07-2016, 11:03 PM
RE: Philco 89B headaches - by OZ4 - 01-08-2016, 07:25 PM
RE: Philco 89B headaches - by sparkydave - 01-10-2016, 12:33 PM
RE: Philco 89B headaches - by sparkydave - 01-10-2016, 02:12 PM
RE: Philco 89B headaches - by klondike98 - 01-10-2016, 02:42 PM
RE: Philco 89B headaches - by AI2V - 01-13-2016, 04:48 PM



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