[happyrabbit]

Lost interest in my NuTube preamp project.   Discovered the pa16 on Apex’s website.  It’s a chip amp.  It’s a bit expensive for a chip amp.   Looks interesting.   

Concept :

Jensen 1:3.5 step-up transformer -> 100k ladder attenuator  -> lsk489 voltage follower(driven by sparkos lab voltage regulators) -> pa16 power op-amp.

Goals:

10 watts @ 8 ohms
26db gain
Using the sanken hwb 30w -/+ 15 power supply

Related links:
http://www.jensen-transformers.com/wp-content/uploads/2014/08/jt-11k8-apc.pdf
https://www.hificollective.co.uk/attenuator/glasshouse-ladder-stepped-attenuator-mono.html
http://www.linearsystems.com/lsdata/datasheets/LSK489_LOW_NOISE,_LOW_CAPACITANCE_MONOLITHIC_DUAL_N-CHANNEL_JFET.pdf
https://www.apexanalog.com/products/pa16.html
https://www.digikey.com/products/en?mpart=HWB030D-15&v=1261
https://sparkoslabs.com/discrete-voltage-regulators/


Pics:

[happyrabbit]

Couple pics of the case..