I have a Dentron MLA 2500B amp - tuneup and meter reading info seems a bit thin in the owner manual, but seem to indicate there SHOULD be about 100 ma peaks in SSB operation, and grid current should not exceed 200 ma when tuning up or operating. Mine has full output, and works great - but the absolute MOST grid current I can produce, is about 100 ma in tuneup - and the meter doesn't even move in full power SSB operation. There's not much in the grid circuit - just a bypass cap and a .0462 ohm meter shunt resistor. I don't have any test equipment accurate at that low a resistance, so before I begin any further testing or parts substitution, am hoping other 2500B owners might offer what their typical grid current readings are. I suspect the possibility the grid shunt might be defective, or the bypass capacitor shorted - all other meter readings seem right on, so doubt any issues with the meters themselves. I'm getting slightly over 1.5 KW out key down, and over 1.8 KW out in SSB peaks into a reasonably accurate outboard watt meter - so pretty sure the tubes are OK, and that is on 115 vac... Any help?