I have an 8552B which has correct gain in Linear, and logs correctly, but reads about 50+dB low in log mode. All step attentuators work exactly right -- but everything is 50+dB too low. Since linear is right, we know its not the RF section. All of the transistors suggested as potential problems on the log card check OK. Has anyone seen this behavior before, and where did the proble lie? I lack extenders -- any pointers for a good source for 141T extenders?