Please read the
introduction to the VS55, VS66, VS56 and VS60 model on the VS 55 page.
The VS56 is the
successor to the VS55. Though the unit looks quite similar there are some
- the optical design was
- better coupling caps
- the preamp tubes are now
- bigger output transformers
- tube clamps for the ECL82
- the preamp design was
- new designed input stage
- feedback loop now using 16Ω
tap on OPT
The ECC808 ought to be
a low noise ECC83, but I think the slight improvement concerning the surface
noise of the VS55 results from the superior input stage.
Finally the bigger OPTs
are another feature which make this amp one of the best sounding Telewatt
recommended version is the original (first) VS56 (without additional low and
high / noise filters) - as shown on the first picture.