Tuesday, December 28, 2010

1626 darling amp with ecc83

this amp is based on bob danielak  'darling amp ' , there's a lot of version of this amp, original caps coupled,  DC darling, schematic can be found here. .
basiclly i built it based on original caps coupled schematic, but change the driver /preamp from 8532 to ecc83
  tubes accepted date : nov 1942.  got it from jasonscard1 on ebay.

amp is built on 'experiment' chassis with all the switch ,sockets and output trannies already screw to chassis  .
                                                 guts shot after finishing wiring

plate voltage 1626-255v
output transformer primary impendence-8k

Sunday, December 5, 2010

stereo single ended EL34 amp with phono stages

 pre drilled chassis , spraypainted matt white as requested by capten dol 'air'.

 heater and power supply wired first.
 close pic from the back

 copper bus for easy grounding ,combine from left to  right channel.
 complete wiring  ,all signal line is shielded to avoid hum,
amp complete built on nov2010 , with extra preamp stages for phono signal level.
4 x 12ax7 ,2 x el34 in triode mode,
el34 plate Voltage- 304v both left and right.

 el34 (right) current draw -73mA
el34 (left) current draw -80mA
bias point sit exactly at 300V 80mA  , which is max for the plate dissiption.