Just finished a new variable EQ phono stage and took some photos before it got shipped to its new owner.
Like previous builds of mono phono preamplifiers, this unit has separate controls for the bass turn over frequency and the roll off at 10kHz.
Output and interstage transformers as well as the B+ smoothing chokes are mounted on the top side under transformer covers:
There is a second support plate for B+ smoothing capacitors, a choke for the heater supply and the remaining parts of the EQ networks.
About one third of the EQ networks mounted :
The power supply top plate:
Chokes go on a separate plate...
.... which is mounted to the underside of the top plate:
Bass turn over selector:
Treble roll off selector:
Vibration damped mounting of the D3a tubes:
Side view of phono stage: