K5528 • Currawong Valve Amplifier - made me an offer I couldnt refuse

https://www.altronics.com.au/p/k5528-currawong-2x10-watt-stereo-valve-amplifier-kit/

Made me an offer I cant remember - cuppla hundred bucks due water damage on the box.  ..

Silicon Chip Online Issue - November 2014 

Silicon Chip Online Issue - December 2014

I buy these to build the speakers with these drivers.  First made in July 22.

 DAEX58FP

 Idea which I considered. A Pi Audio Hat

https://core-electronics.com.au/raspberry-pi-iqaudio-dac-pro-48159.html

Raspberry Pi IQaudio DAC Pro

SKU: CE07563

https://www.max2play.com/en/2016/01/raspberry-pi-zero-with-iqaudio-dac/ https://www.sparkfun.com/products/17738

Decided not to. It is too complicated to get the audio to it. Perhaps .wav files to get proper Hi Fi Audiophile cred? Not worth it. 

 

FAULT : Both channels intermittently becoming quite and distorted. 

When i tried to power the Wi Fi  source from a USB source there was a huge hum so i just temporarily powered it off a battery pack.  This time i should derive the Power from the 12 Volt DC heater line and that way there are no external earths. 

 The audio input needs to be wired to the in/out panel.  

Fixed that and biffed out that horrible bluetooth abomination i had and relpaced it with an automotive one.. Deriving the 12 volt from the heater voltages.

Much Much nicer but these snot green planar "speakers' still sound terrible. And very quiet. 

I have some scrap speakers to test out but probably best I aim to get some twin code old school efficient conventional speakers. They are slightly better bass but still very quiet at full volume.

FAULT : The 330 Ohm 5 watt resistors are cooked. 

I left out a link .. I did put a link on LK4 / 5 which complete the feedback loop presumably can remove them for testing. The links I left out are next to them.

https://www.diyaudio.com/community/threads/silicon-chip-mag-currawong-amp.264057/page-4?utm_source=chatgpt.com