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Monday, November 2, 2020

Making of a D3a LCR Phono Preamplifier

 Hi!

Here some photos of a recently finished phono stage and it's construction process.



This time the color scheme is black / gold.




As all my phono stages it has an outboard power supply.



For more technical details check the post about a previously built unit.



Some impressions from the assembly steps:



Starting with the bare metal plates. 

The tube sockets have their own vibration damped sub plates:




Power supply plate with sockets and some resistors mounted and partially wired:




The high voltage transformer is mounted on the top side:



The heater supply has it's own transformer which is mounted on the under side.



All chokes are on a separate plate:



Almost finished power supply:




Power supply done:



The signal section with transformers and LCR modules:



Power supply chokes for decoupling of the individual stages on a separate assembly:



Almost finished:



The remaining spaces will take high voltage decoupling caps and MC step up transformers



Ready to be inserted into the wooden frame:



The finished signal section.




The phono with power supply:




Best regards


Thomas

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