As to you lamp dimming, I do not know what the wiring capacity of
your
house was but the transmitter was being fed by the same mains drop
from
the street as the lamp. That is, IMO, the most likely cause of the
dimming. Just my guess.

Dave WD9BDZ

=======================================
Dave,

The mains supply from the road was capable of 50 kilowatts without
excessive volts drop. For a few years it was used for electric
cookers, several 3-bar central heating radiators, etc., without
problems. Far more than the TS-520 with an RF power output of 100
watts.

There may been something very peculiar with the 60-watt bedroom
filament lamp which caused it to cool off when both RF plus 50Hz power
currents flowed through it. I didn't try another bulb.

There may have been incorrect house wiring such that the only power
point in the bedroom, used for the transmitter, was connected, by
mistake, to the lighting circuit. But even then, the lighting circuit
should have been capable of withstanding the load of the transmitter
without much of a voltage drop. Shortly afterwards I moved the shack
downstairs into the garage. At the time I never checked house wiring
and later on the family sold the house and moved. The new owner was
not a radio amateur.
----
Reg, G4FGQ.