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RE: Tube Analogue Stage (DAC) Cum Pre-amp for CMP^2

The grey boxes are battery holders for the filaments. The semi-transparent ones inside the case are old ones for holding Lithium batteries. They died because I forgot to swtich off the amp a couple of times. Now I'm using three NiHm batteries per tube for the filament. External so that I can replace them when drain. Recharge by regular charger.

The small board next to the IEC socket is the charger for the internal lithium batteries! The longer PCB with big caps and regulators are the charger board for HT and reserve low voltage charger. The pre-amp, when off, will self-charge, very easy to use.

The tubes are self-biased by resistors, they don't need a bypass cap because the loadings are battery biased current sources.

Other photos upcoming.


Edits: 05/31/10 05/31/10 05/31/10 05/31/10
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