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DAC-ASH (dac-end 2 up date)

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#461
Getting There

An externally hosted image should be here but it was not working when we last tested it.


Nearly at the point to start drilling the chassis, but will probably move the power supplies into their own box. The (incomplete) output stage power supply (E-I transformer, blue turret board, 2x chokes & DC heater supply (6 caps on stripboard) is taken from Thorsten Loesch's design, which is optimised for the AD1865: http://www.fortunecity.com/rivendell/xentar/1179/theory/vasfda/vasfda.html

An externally hosted image should be here but it was not working when we last tested it.


No bypass capacitors used & Black Gate PK used for all IC decoupling. Analogue power supply uses Elna Silmic and digital uses Elna Cerafine & Oscon SP. Shinkoh I/V resistors & PRP resistors everywhere else. Minimal magnetic parts are used, so even more reason to put the transformers in their own box!

An externally hosted image should be here but it was not working when we last tested it.


Teflon sockets, 6H23n-EB tubes, 1/2 watt PRP resistors & film/oil Obbligato output caps (large as they're driving a passive preamp) for the SRPP gain stage again taken from Thorsten Loesch's design.
 
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#472
Quanghao do you have a BOM for the board you sent me as the resistornumbers don´t match with the new pcb´s?


Edit:Actualy I see now this board only have one kathode resistors wheras the new board has 2/tube...
Didn´t you have any new Pcb´s to send?....
 
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#476
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