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Old 21st Apr 2017, 3:38 pm   #1
Chicoull
Triode
 
Join Date: Dec 2016
Location: Elgin, Moray, UK.
Posts: 31
Default Bush DAC 90A Conversion

I have just finished restoring my Bush DAC 90A, but want to take it a little further by adding Bluetooth. I have a GEC set which has a GRAM input, so adding BT to that was easy.

The bush not having GRAM is a bit different. My setup is a BT r/x which is powered by a 240Vac/5Vdc power supply. The radio input to the Volume Control is disconnected and the output of the BT fed in at this point.

The BT connects fine and volume control is available at both my iPad and the radio. However, with the radio input disconnected, there is a radio channel still transmitting over the BT. With the BT switched off the radio transmission is clear, but at a fixed volume - the radio Vol knob having no effect on this signal.

Any ideas where the fixed volume signal is coming from with the input disconnected at the volume control?

It is my intention to connect the radio and BT inputs to the volume control via a DPST switch - giving me the best of both worlds.
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