Stereo integrated
PUSH PULL 300B
Which has a lot of inconvenients or you can go for Push Pull
Recently PP has been out of favor by many high end enthousiast
This was mainly due to the upcome of SE and the whole frenzy
around it . just keep an open mind that nothing is really perfect
and that there are many ways of achieving audio nirvana.
One of the big advantages that PP has
is the fact that ps ripple
will cancel itself in the output tranny, you still need to filter
it well for the fase inverter .
This design is one of simplicity , no
feedback and simple straight
forward textbook design , with negative bias psu , which I prefer
They sound a bit faster , especially in the lows .
You do need a pretty powerfull pre amp
to drive this amp
So do not blame the power amp if quality is not up to standards
Try the simple 6SN7 DC coupled pre amp
it’s perfect (nothing is)
Here is the schematic :
You can use a HT anywhere from 250 Vdc to 550 Vdc
Which means you can substitute the output
tubes from
2A3 , chinese 300B , Cetron 300B , Krone VV32/52 family
The only thing to adjust are the anode
load resistors in the 6SL7
and its cathode resistor as well since the bias voltage will
change
the filaments for 300B are just parallelled , use separate supply
for each channel .
For the 2A3 they are put in series and
the mid point goes to ground
again use separate supply’s
Kit price :
Version 2,0 all included with sovtek tubes 300B and NOS6SL7
cables, capacitors & resistors & tubes , sockets , chassis , transformers
price kit : 999 Euro excl VAT
see the picture of finished
product .
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