--- product_id: 333147301 title: "BoyuuRange A50 MKV 300B HiFi Intergrated Tube Amplifier with Tube Cage | Single-end Class A Valve Amp with PRE‑IN & Balanced Inputs" brand: "boyuurange" price: "$2296.67" currency: USD in_stock: true category: "Boyuurange" url: https://www.desertcart.us/products/333147301-boyuurange-a50-mkv-300b-hifi-intergrated-tube-amplifier-with-tube store_origin: US region: United States of America --- # 300B Single-Ended Class A Tube Sound PRE-IN & Balanced Inputs for versatile connectivity Detachable Tube Cage with vintage metal chassis BoyuuRange A50 MKV 300B HiFi Intergrated Tube Amplifier with Tube Cage | Single-end Class A Valve Amp with PRE‑IN & Balanced Inputs **Brand:** boyuurange **Price:** $2296.67 **Availability:** ✅ In Stock ## Summary > 🎶 Elevate your sound, own the vibe — tube warmth meets modern precision. ## Quick Answers - **What is this?** BoyuuRange A50 MKV 300B HiFi Intergrated Tube Amplifier with Tube Cage | Single-end Class A Valve Amp with PRE‑IN & Balanced Inputs by boyuurange - **How much does it cost?** $2296.67 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/333147301-boyuurange-a50-mkv-300b-hifi-intergrated-tube-amplifier-with-tube) ## Best For - boyuurange enthusiasts ## Why This Product - Trusted boyuurange brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact Powerhouse:** 7.6W max output in a sleek 18kg frame, perfect for desktop or dedicated listening spaces craving tube amp warmth. - • **Robust Vintage Design:** Solid stainless steel chassis with a retro tube cage protects your investment while making a bold style statement. - • **Warm, Rich Tube Audio:** Experience authentic 300B vacuum tube warmth that elevates vocals, jazz, and classical music to audiophile bliss. - • **Flexible High-Fidelity Inputs:** PRE-IN and balanced inputs ensure crystal-clear, stable signal transmission from all your premium audio sources. - • **Optimized Circuitry for Deep Bass & Clarity:** Senior audiophile-grade electric circuit refinements deliver enhanced aroma, intermediate frequency, and bass response. ## Overview The BoyuuRange A50 MKV 300B HiFi Integrated Tube Amplifier is a premium single-ended Class A valve amp featuring newly upgraded PRE-IN and balanced inputs for versatile connectivity. It delivers warm, smooth, and richly detailed audio through authentic 300B output tubes and 6SN7 drivers. Housed in a sturdy vintage-style stainless steel chassis with a detachable protective tube cage, it combines retro aesthetics with modern audiophile-grade circuit optimizations for superior bass and clarity. With a maximum output power of 7.6W and FCC certification, this amplifier is designed for discerning listeners seeking both style and sonic excellence. ## Description Buy BoyuuRange A50 MKV 300B HiFi Intergrated Tube Amplifier with Tube Cage | Single-end Class A Valve Amp with PRE‑IN & Balanced Inputs: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases ## Features - 2026 Newly‑Upgraded Version A50 MKV！Upgraded Audio‑Input Options: The new A50 MKV adds PRE‑IN and balanced audio inputs on the basis of classic RCA ports, bringing you more flexible connection choices for external audio sources and stable high‑fidelity signal transmission. - Authentic 300B Single‑Ended Class‑A Tube Sound: Comes with 300B output tubes and 6SN7 driver tubes, delivering warm, smooth and rich‑detailed vacuum‑tube audio performance for vocal, jazz, classical and folk music. - Solid‑Built Vintage‑Style Chassis: Features a sturdy metal housing and detachable protective tube cage, which helps protect the internal tubes while adding retro aesthetic to your audio setup. - Power Transformers: new imported 0.35, stack thickness 60MM (114-60).Output amplifier core: core 0.35 new imported thick high silicon (86-50). - Some of Senior audiophile optimization the electric circuit,it is better at arom,intermediate frequency and bass. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B094HX4LMY | | Best Sellers Rank | #100,063 in Electronics ( See Top 100 in Electronics ) #615 in Audio Component Amplifiers | | Brand Name | BOYUURANGE | | Customer Reviews | 4.3 4.3 out of 5 stars (149) | | Item Dimensions | 14.76 x 11.42 x 7.09 inches | | Item Highlight | Single-end Class A Valve Amp with PRE‑IN & Balanced Inputs | | Item Weight | 18 kg | | Manufacturer | Reisong | | Material Type | Stainless Steel | | Maximum Output Power | 7.6W | | Maximum Supply Voltage | 120 volts | | Minimum Supply Voltage | 110 volts | | Model | BOYUURANGE A50 MKIII 300B | | Mounting Type | Surface Mount | | Number of Channels | 2 | | Number of Items | 1 | | Number of Packs | 1 | | Part Number | BoyuuRange A50 MKIII 300B | | Specification Met | FCC | | Unit Count | 1 Count | | Voltage | 120 volts | ## Product Details - **Item dimensions L x W x H:** 14.76 x 11.42 x 7.09 inches - **Manufacturer:** Reisong - **Maximum Supply Voltage:** 120 volts - **Minimum Supply Voltage:** 110 volts - **Voltage:** 120 volts ## Images ![BoyuuRange A50 MKV 300B HiFi Intergrated Tube Amplifier with Tube Cage | Single-end Class A Valve Amp with PRE‑IN & Balanced Inputs - Image 1](https://m.media-amazon.com/images/I/51d6lZmBDKL.jpg) ## Questions & Answers **Q: I have a full range 103db speaker and my hearing is sensitive to speaker hiss at idle. Does this amp generate speaker hiss at idle?** A: My speakers are 89 dB sensitivity and I can hear tube hiss at 12 o'clock on the volume control if I put my ear on the drivers without music playing. Not a problem at listening position and at 12 o'clock the music is plenty loud in my biggish room (40x18x9). At 105 dB it may be a problem but I guess you won't need to crank it to 12 o'clock either. Hope that helps. Overall I am very happy with the purchase. Great value, great sound, well built amp. The support service has been quite responsive too. Good luck **Q: What's the difference in sound characteristics between this 300b amplifier vs an el-34 amplifier such as the boyuurange mt-34? thank you...** A: The 300B sound is magical in the midrange, with less definition than EL34 in the bass and treble regions. If you're into vocals,300B is the way to go, not so much rock or electronica. **Q: How is it that you isolate the rectifier board from the chassis?** A: Vinh, I took an audio recording of the hum just to try and find out exactly what kind of hum it is. I inspected the recording through a spectrogram. It turns out the hum is actually a chord of hums. There are hum notes at 95hz, 120hz*, 240hz* 360hz*, 600hz, and 720hz (*these were the loudest notes). I used a multimeter and checked for continuity between the IEC and RCA grounds. There was continuity. I opened up the unit and removed the exact rectifier board screw you described, as per your instructions. The hum was still present. There was still continuity between the IEC and RCA. I then tried removing all but one of the screws (I did not remove the screw that transformed the hum into a buzz when removed). The hum was still present. I checked the IEC and RCA for continuity with these three screws removed; there was continuity. Since removing those three screws did nothing, I put them back. Out of curiosity, I removed the one screw with the metal ring that was a part of the board underneath it. After I removed this screw I checked for continuity between the IEC and the RCA; There was NO continuity when this particular screw was removed (again, this is the screw that when removed, added unbearable buzzing to the amplifier output). I put that screw back since I already documented what this unit sounded like with this particular screw removed. Nothing I did to the rectifier board solved my hum issue. This is a low-level hum coming from 96dB sensitivity speakers that sit about one meter away from my listening position. Other bits of diagnosis information: If I listen to loudly mastered music playing at a low to moderate volume, I don’t hear the hum. If I listen to quietly mastered recordings at low to moderate volume, the hum is noticeable. The hum does not change whether the volume knob is at minimum or turned to maximum. The hum does not change when the input is changed between Aux, CD, and Tape. The hum did not change when there were absolutely no inputs plugged into the amplifier. Swapping the positions of all the tubes did not change the hum. I am completely baffled. **Q: Can this amp drive a pair of def. tech.bp7002: frequency response 15-30,000 hz sensitivity 92 db 8-ohm imped up to 400 watts? thx!** A: Definitely, unless you are playing hard metal rock to ear splitting level. It drives my 8 ohm, 87 dB sensitivity speakers to satisfying level. Go for it. ## Frequently Bought Together - BoyuuRange REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage - Micca 14 Gauge Pure Copper Speaker Wire, 12 Feet (4 Meters 13.1ft Actual), 2 Pack Pair, Gold Plated Banana Plugs, Soldered Construction, Slim Design, 245 Strands, for Stereo or Home Theater - AC Power Filter Power Conditioner - WAudio AC Power Purifier with Surge Protector, Black --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/333147301-boyuurange-a50-mkv-300b-hifi-intergrated-tube-amplifier-with-tube](https://www.desertcart.us/products/333147301-boyuurange-a50-mkv-300b-hifi-intergrated-tube-amplifier-with-tube) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-09-04*