On Feb 7, 3:11 pm, (Scott Dorsey) wrote:
terryS wrote:

Unfortuantely somebody 'sold' his parents (the youngsters Christmas
gift) at an excessive price a B and K Dynaquik 500, tube tester which
is not only somewhat used and very mouldy but also doesn't work!

What doesn't it do?

Hit the case with Lysol and get the mold off. Then apply power, and
tell me what happens. Can you center the meter? If you put a tube
in, does the filament light up? Is the series light bulb good or has
it gone open?

All transconductance testers are basically a power supply, some series
and shunt resistors, and a meter. Plus a lot of switching. If nothing
works, it's in the power supply.
--scott
..
Thanks Scott and other replies: About to work on it today. Have just
used Javex/Javel/Lysol etc on the inside of the case etc. and what a
strange odour/smell emanated!
Anyway the box and a couple of bits are now drying. The bottom layer
of charts seem glued/pasted into the lid; so who knows what's living
in there?
We have to do some snowblowing outside then trouble shoot the B&K.
Will advise. terryS