Adopting Beijing 6N2 and FU19 vacuum tube to form parallel class A amplification circuit. Max output power is 4w+4w, suitable fo two-divided-frequency passive speakers above 6.5 inch whose impedance between 4 and 8 ohm, sensitivity above 90db. And suitable for 32-600 ohm headphones and max output power can up to 1W. Nobsound & Douk Audio. Preamp & Phono Stage. DAC & Audio Adapter. Music Spectrum & Clock. Record Player & Turntable Part. Audio Board & DIY Kit. Bluetooth & XLR & MIC. Tube Sound Level Meter. LED Sound Level Meter. Board & DIY Kit. Record Weight & Clamp. 1/8 & 1/4 Stereo Jack Cable. FM30 Vacuum Tube Power Amplifier Class A Stereo Audio Amp Headphone Amplifier. All replacement components are of the same level, and there is no difference in function and effect. Adopting Beijing 6N2 and FM30 vacuum tube to form parallel class A amplification circuit. Max output power is 4W+4W, suitable fo two-divided-frequency passive speakers above 6.5 inch whose impedance between 4 and 8 ohm, sensitivity above 90db. HiFi clear sound, the overall low, medium and high frequency is very balanced, the low frequency is still powerful, the mid frequency is warm and mellow, the high frequency is distinct and rich in detail. With 1 group standard RCAinput, compatible with many audio devices such as TV, CD player, computer, etc. With perfect headphone protection circuit and output transformer no-load protection. All use AC filament lighting, listening with above 102DB headphones, no noise can be heard. High quality components and advanced manufacturing processes. Output transformer made of Z11 0.35MM 6632 silicon wafer. Power transformer made of H 14 360 0.5 annealed silicon wafer. Taiwan-produced A100K fully sealed volume potentiometer to ensure clear positioning and balance. Metal film resistors with up to 1% accuracy and imported electrolytic capacitors. 0.8mm brushed stainless steel with wood chassis structure. Warm tips: 4 ohm speaker output is not controlled by the headphone / power amplifier switch which is designed to switch 8 ohm output and headphone output. Audio input: stereo RCA. Audio output: banana speaker jacks / 6.35mm headphone jack. Max output power: 4W × 2 (4?). Heaphone output: max about 1W. Frequency response: 26-38KHz(±2db). Signal to Noise Ratio: > 118dB. Input Sensitivity: 500 – 2000mV. Dimensions(WHD): 296 × 128 × 175mm / 11.655.036.88in. Net weight: 5.7kg / 12.56lb. Package weight: 6.9kg / 15.21lb. Please leave VALID TELEPHONE NUMBER which is necessary and very important. For package less than 2KG, we use. (10-25 days to most countries). And for package over than 2KG we use. (5-8 days to most countries). Free Return Within 30 Days. We provide return within 30 days. Is provided for all items. Man-made damage or misuse. Audio accessories and consumables such as vacuum tubes. If you are satisfied with our products and service please leave a 5-star. Feedback, we will provide better solutions until you are satisfied. Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including. Douk Audio / Nobsound / Little Bear. As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable. We will spare no efforts to bring great products and service for. Improve our customers’ listening experience. During holiday, please allow us to response you early next week. Please don’t leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation.