Finished Class A Field Tube Power Amplifier Tube Hi-end 95W+95W High Power Amplifier Replacement for Goldmund

Finished Class A Field Tube Power Amplifier Tube Hi-end 95W+95W High Power Amplifier Replacement for Goldmund

Description:
- The circuit of this board is based on the famous machine for Goldmund and adopts the classic circuit for Goldmund. The input and output are all field effect transistors, and the sound is delicate and durable, with a sweet human voice.
- The input stage adopts for Goldmund classic input level circuit and uses for Toshiba 2SK170 BL field transistors. The voltage amplification stage uses for Motorola MPS A42/92 pair transistors, and the driving stage uses ON MJE15034/35 for Onsemi. Each channel has 4 pairs of 2SK1058/2SJ162 field transistors for parallel output, which meets the requirements of home bookshelves and floor boxes without any problems.

Features:
- The sound has a vacuum and warm feel, with a delicate and sweet human voice. The low frequency is not too hard and the control is excellent.
- The input stage is compatible with two installation modes, allowing for the selection of two precision paired field-effect transistors or the use of a twin field-effect transistor such as 2N5564, 5565, 5566, etc.
- Given the current difficulty in obtaining genuine twin tubes, two precision paired original 2SK170 BL field tubes for Toshiba are used on the board.
- The board is equipped with a complete horn protection circuit, making installation easier. Including midpoint voltage offset, overcurrent detection, on/off mute, and over temperature protection.
- Each channel has 4 pairs of original imported 2SK1058/2SJ162 field-effect transistors, with strong output power. At a unilateral output of 420W/4ohms, the Class A power is 95W/4ohms on one side, and the total thrust is equivalent to over 400 watts per channel. It can guide and balance the sound while better pushing some high-power boxes.
- The entire board of components is made of enthusiasts level imported components, including for KOA, for Panasonic, for Vishay, for Fukushima resistors, for BI adjustable potentiometers, brand new imported genuine field transistors. Good devices will bring better stability.
- All the capacitors on the entire board are imported enthusiasts capacitors. Feedback uses for Philips BC axial electrolysis, for FW gold decoupling electrolysis, for RIFA 426 series input coupling capacitors, for SPRAGUE CBB capacitors, for NTD mica capacitors, for Siemens CBB, for WIMA CBB, for NISSEI CBB capacitors, and for Philips silver film capacitors. Solid materials can bring a lot of bonuses to good sound.
- The selection of components is more professional, using original imported 30A high current fully sealed relays, which are fully sealed and not easily affected by moisture and oxidation, with a longer service life and more stable performance. For Omron transparent shell is only suitable for low-power boards and dry usage environments.

Specification:
- Frequency response: 20 - 25KHz
- SNR: 110DB
- Output power: 95W + 95W/4ohm
- Power supply: dual DC50 - 70V + AC12V; dual DC60V + AC12V power supply is recommended
- Power requirements: recommend two transformers with a capacity of 500W or more, and the recommended capacity for rectification on one side should not be less than 60000 micro-factors.
- Input sensitivity: 1.3V/RMS
- THD + N: <= 0.008%
- Board size: 280 x 125 x 38mm
- Unilateral heat sink: no less than 2.5kg

Package Included:
- 1 x Power Amplifier Board
- 1 x Temperature-control Tube
- 1 x Screw Pack
- 1 x User Manual