[1000mp] Production Date of Mark-V?

[Yuri Onipko]

> >
> > Furthermore I'd like to know, whether the grumbling (deep humming, like
a
> > bumble bee) of the fan is normal, or if this might be signal, that the
fan
> > was already running for a long time and the bearings of the fan are
already
> > "worn out"?
> >
> > 73 de Uwe, DL8UF
> >

Open the top cover and check the speaker wires - they might be touching the
fan.

73 Yuri  VE3DZ