[sdiy] Help needed for a HOHNER Pianet “T”

[Stavros Gregoriou]

Hi everyone,

Anyone familiar with this 5 octaves electromechanical vintage keyboard from 
HOHNER please?

It operates without electrical power and with no batteries. It only has a Mono 
output that needs to be connected to an external preamplifier before going to 
the amplifier.
For almost 50 years it has worked with no problems! Lately its output comes and 
goes.

The only electronic parts that it contains (which I am not sure at all what they 
are), other than the electromechanical directly associated with the keyboard 
keys, is a small PCB populated with a ceramic cap(?) and a transformer(?) 
similar box, on a pin of which the single insulated copper wire coming from the 
keys is soldered. The Mono output jack is connected to this PCB.
 
I will appreciate your help in solving this problem and getting the “Pianet” 
back in order!
 
Many thanks
 
Stavros