hello, following my E80CC 2A3 preamp, I took the same principle to make an amp,DRD.
just the right transformers and the 6C45Pe as input on 200H 30mA plate choke
the swing will be done
and way not... headphone output,
and way not ... XLR line outputs to drive a high power amp???
the signal-to-noise ratio allows it thanks to the 6C41C triode regulation of the HT @550V
which is perfectly comfortable thanks to the progressive raw HT rise delivered by an EY500A EI nos nib.
yesterday I listened Bob Dylan on HD800 sennheiser headphones, uahoo the clarity and the softness,
then on the fostex 208 BLH a deep bass already at low volume!
exceptional linearity from 15Hz a straight line
right now I'm listening in preamp mode driving PA amp 16X lateral mosfet exicon 25N/P10 i took of my Chevin 1500 that I modified, (replaced the power supplies for less voltage and more bias)
on my onken 2X15 bass guitar cabinet and two compressions from 1K2 KHz passive filtering
it's almost mono because only one cabinet, we're having fun, we're testing,
but let's get back to this amp....preamp???? or headphone amp????
as power amp we largely exceed the 3W5 that the 2A3 usually delivers,
the direct coupling provide grid current control for few more watts without abrupt distortion
as like on a classic assembly with a coupling capacitor and high value grid leakage resistors
the sinusoid is without visible distortion at 6V/8ohm with a 2A3 monoplate (I prefer).
if the final use is power amp, the transition to 300B is simple
replacement of the two 3.3V 25W meanwell for the 5V25W smps modules heating and modification of the grid cathode polar resistors
the power supply transformers deliver 600V 150mA and the first capacitor after 4X4 diodes 1uF 1KV MKT and after the EY500A slow polarization valve 10uF 1KVolts oil, no stress
the smooting choke 10H 200mA
the two filtering chokes 10H 90mA each
the output transformers allow 100mA
who nows tomorrow wath to decide, or not????
showing original E80CC 2A3 inspiration pream schematics
just the right transformers and the 6C45Pe as input on 200H 30mA plate choke
the swing will be done
and way not... headphone output,
and way not ... XLR line outputs to drive a high power amp???
the signal-to-noise ratio allows it thanks to the 6C41C triode regulation of the HT @550V
which is perfectly comfortable thanks to the progressive raw HT rise delivered by an EY500A EI nos nib.
yesterday I listened Bob Dylan on HD800 sennheiser headphones, uahoo the clarity and the softness,
then on the fostex 208 BLH a deep bass already at low volume!
exceptional linearity from 15Hz a straight line
right now I'm listening in preamp mode driving PA amp 16X lateral mosfet exicon 25N/P10 i took of my Chevin 1500 that I modified, (replaced the power supplies for less voltage and more bias)
on my onken 2X15 bass guitar cabinet and two compressions from 1K2 KHz passive filtering
it's almost mono because only one cabinet, we're having fun, we're testing,
but let's get back to this amp....preamp???? or headphone amp????
as power amp we largely exceed the 3W5 that the 2A3 usually delivers,
the direct coupling provide grid current control for few more watts without abrupt distortion
as like on a classic assembly with a coupling capacitor and high value grid leakage resistors
the sinusoid is without visible distortion at 6V/8ohm with a 2A3 monoplate (I prefer).
if the final use is power amp, the transition to 300B is simple
replacement of the two 3.3V 25W meanwell for the 5V25W smps modules heating and modification of the grid cathode polar resistors
the power supply transformers deliver 600V 150mA and the first capacitor after 4X4 diodes 1uF 1KV MKT and after the EY500A slow polarization valve 10uF 1KVolts oil, no stress
the smooting choke 10H 200mA
the two filtering chokes 10H 90mA each
the output transformers allow 100mA
who nows tomorrow wath to decide, or not????
showing original E80CC 2A3 inspiration pream schematics
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