I bought this kit and built it: Dynamic&Passion Hi Fi XLR Balanced Single ended Preamplifier Board Valve 12AU7 Tube Preamp DIY Kit American ARC Circuit|tube preamp|tube preamp diypreamplifier board - AliExpress
This preamplifier is a true balanced design and requires 4 transformers for its full functionality
1 - one for the trubes that must provide 275 - 300V
2 - two transformbers for balanced /signle ended conversion
3 - another one to provide 14V
I commissioned edcore to build me a power transformer that provides 275,. 6.5 and 5v. I use the 275 and the 6.5 volt outputs in this build
i commissioned edcore to build two 600:600 transformers for the balanced to single ended conversion
i used antek for the 15v
I am selling the completed boards confirmed working plus the edcore transformers
click here to see the build:
Chinese 12au7 / 6922 pre amplifier finally working - YouTube
price is $99 for everything which is %60 he price of the edcore transformers and the completed boards are free but shipping will be between $35 to $55 depending on destination. I will not include the antek transformer.
I decided to use this between a soekris DAC and a class D amp to build an integrated but then decided to go directly from DAC to the amp and dont want the pre amp stage
no tubes will be included
i removed the volume controller and i did it a little rough. the board is not damaged but he flat cable that connects the included motorized volume pot to the bcb is destroyed.
RCA connectors are included but XLRs are not.
when ordering i paid them $40 extra to uplgrade all the film caps to vishay
This preamplifier is a true balanced design and requires 4 transformers for its full functionality
1 - one for the trubes that must provide 275 - 300V
2 - two transformbers for balanced /signle ended conversion
3 - another one to provide 14V
I commissioned edcore to build me a power transformer that provides 275,. 6.5 and 5v. I use the 275 and the 6.5 volt outputs in this build
i commissioned edcore to build two 600:600 transformers for the balanced to single ended conversion
i used antek for the 15v
I am selling the completed boards confirmed working plus the edcore transformers
click here to see the build:
Chinese 12au7 / 6922 pre amplifier finally working - YouTube
price is $99 for everything which is %60 he price of the edcore transformers and the completed boards are free but shipping will be between $35 to $55 depending on destination. I will not include the antek transformer.
I decided to use this between a soekris DAC and a class D amp to build an integrated but then decided to go directly from DAC to the amp and dont want the pre amp stage
no tubes will be included
i removed the volume controller and i did it a little rough. the board is not damaged but he flat cable that connects the included motorized volume pot to the bcb is destroyed.
RCA connectors are included but XLRs are not.
when ordering i paid them $40 extra to uplgrade all the film caps to vishay
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