Klein + Hummel's origin
is the development and manufacturing of very high quality studio equipment.
Many parts and units found in the hifi gear are derived from the
professional equipment. Many output transformers are of outstanding quality.
Later they made a legendary hifi tuner, FM 2002.
The VS44 is a very nice
ECL82 single ended amp which was introduced with a gold/black color front with a red Telewatt
logo which was later changed for black / silver design. It is rated at 1.5
watts sine wave output (with 1.6% distortion).
This is the only K+H
amp who does not suffer from too many switches and tube stages the signal
has to pass. Another very nice feature is the EZ81 tube rectifier and with
good ECL82 tubes the amp works pretty good with speakers of higher
efficiency. The ECC83 input tube allows to use the triode section of the
ECL82 as good working driver. So the amp works (and sounds) much better than
other ECL82 single ended amps (as the Telefunken S80 / S81).
As in many vintage
single ended amps hum is a problem in most samples. In the unit I personally
use I have installed an additional filter cap in the hole beside the ECC83
tube. Though I use new tubes I only achieve 1 watt of output power, but for
my Altec speakers this is enough.