My layout is currently being run by a Lionel KW transformer (190 watts). I bought it used about 12 years ago (so I'm not sure how old it is) but it's been a pretty good power source for a long time.
Recently, I've noticed issues with my Protosound-2 engine running on it. Even at full power (20 volt output) the engine is unable to reach a high speed on line A. On line B it is able to get a bit faster, but it is still slower than normal. Putting a voltmeter to the rails shows line A only putting out 15 volts with the engine on it while line B puts out 16 with the engine on it. When it is not connected to the track, both line A and B output 19 volts.
I've taken apart the transformer and cleaned the contact wheels on the coil. There was a considerable amount of carbon build up. Unfortunately, cleaning it resulted in no change. Therefore, I've been wondering if the transformer is dying. Has anyone had experience with an older Lionel KW?
I was considering replacing it with an MTH Z-4000. All 4 of my engines are MTH (3 Protosound-1's, and 1 Protosound-2) so an MTH transformer would probably be the better option for me. Before I drop $500 on the thing, I wanted some opinions. Maybe even some tips on what could be causing the voltage difference between line A and B and what I can do to get the Protosound-2 engine to run better on this old transformer.
Thanks in advance!