Scratch building a 5670 / 2C51 / 396A single tube preamp (linestage) for a 2 channel HiFi stereo system. Single amplification stage through a high quality Output Transformer. This will also drive a high impedance headphones. (i.e. AKG K240 600ohm)
This topology is known are Parallel Feed and it requires a high quality capacitor and an unique output transformer to function properly.
Specs:
600ohm output
~5-6 db of gain (depending on bias)
1-5670 vacuum tube (1 tube for both channel)
Two (2) 15k Pri - 600ohm Sec output transformer Magnequest B7 (or Edcor XSM 15k-600)
One 250vac ~25-45ma power transformer (i.e. Hammond 261C6)
CRCRC Power Supply
If you enjoyed this video and if you downloaded the build documents, please consider buying me a coffee. I would appreciate your support:
[ Ссылка ]
Valve Amplifiers - Morgan Jones - [ Ссылка ]
12AU7 Preamp build: [ Ссылка ]
6SN7 Preamp build: [ Ссылка ]
Preamp Schematic: [ Ссылка ]
Basic Layout:
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Parts List: [ Ссылка ]
Goldpoint Level Controls: [ Ссылка ]
Output transformer: [ Ссылка ]
CCS Worksheet: [ Ссылка ]
Alternate Filament supplies: [ Ссылка ]
5670 Tube Data Sheet: [ Ссылка ]
Tubes: [ Ссылка ]
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IU Chassis: [ Ссылка ]
WARNING: Tube amplifiers contain very high and potentially lethal voltages!
Drain all filter caps and check voltages before commencing work.
Hakko Solder Station: [ Ссылка ]
Kester Solder: [ Ссылка ]
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