Originally Posted by
Kevin Gilmore /img/forum/go_quote.gif
The 727 is a local feedback version of the 717. The 727 has a current source, the 717 has a resistor. Otherwise virtually identical.
The 727 runs the output stage at higher power.
The kgss and the 717 are similar amplifiers. (4 stage amplifiers)
The kgsshv and the 727 are similar amplifiers
except the kgsshv uses global feedback. (4 stage amplifiers)
If people want it, the next revision of the kgsshv boards will have the local/global feedback option. [which it has]
Personally i like the sound of the global feedback version better.
The 313 and 323 are 3 stage amplifiers. Same or similar to all the transportables (srmXh,srm151,srm252)
There are the 2 ac coupled single power supply amps, sr-001 and srm300
the srm-t1, t1s and 006t are virtually identical. (solid state/tube hybrid)
the 007 has twice the number of output tubes and runs the output stage at twice the power. (solid state/tube hybrid)
The T2 is a tube/solid state/tube hybrid.
The BH and BHSE are essentially the T2 output stage with the kgss input stage configured for 800 volts.
For stuff older than the srm-t1, things get complicated. spritzer has more of the really old schematics.