---
product_id: 333147301
title: "REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage"
brand: "boyuurange"
price: "$2935"
currency: NZD
in_stock: true
reviews_count: 8
category: "Boyuurange"
url: https://www.desertcart.nz/products/333147301-reisong-a50-mkiii-300b-hifi-intergrated-tube-amplifier-single-end
store_origin: NZ
region: New Zealand
---

# 7.6W Class A output Dual 300B PSVANE tubes Protective tube cage included REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage

**Brand:** boyuurange
**Price:** $2935
**Availability:** ✅ In Stock

## Summary

> 🎶 Elevate your sound game with vintage warmth and modern precision!

## Quick Answers

- **What is this?** REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage by boyuurange
- **How much does it cost?** $2935 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/333147301-reisong-a50-mkiii-300b-hifi-intergrated-tube-amplifier-single-end)

## 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

- • **VU Meter Visuals:** Classic VU meters provide real-time feedback, blending retro charm with modern performance.
- • **Pure Class A Warmth:** Experience rich, detailed sound with 7.6W single-end Class A amplification that audiophiles crave.
- • **Premium PSVANE 300B Tubes:** Equipped with dual high-end PSVANE 300B tubes for that iconic, smooth tube warmth and clarity.
- • **Audiophile-Grade Circuitry:** Enhanced inductance transformer and bipolar filter circuit deliver superior bass, midrange, and immersive soundstage.
- • **Robust Build with Tube Cage:** Stainless steel chassis paired with a stylish tube cage ensures durability and eye-catching vintage aesthetics.

## Overview

The REISONG A50 MKIII is a premium integrated tube amplifier featuring dual PSVANE 300B tubes and a single-end Class A design delivering 7.6 watts of pure, warm audio. Its robust stainless steel build includes a protective tube cage and classic VU meters, while advanced circuitry optimizes bass and midrange frequencies for an immersive listening experience. Perfect for discerning audiophiles seeking rich, detailed sound with vintage flair.

## Description

Buy BoyuuRange REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Audio quality = AMAZING (detailed, tubey); factory QC = POOR (crackling noise, loose knobs) - AMAZING, nothing short of AMAZING, but not without its hiccups. This is my second A50 purchase, coming from the Sprout100 and the INFI hybrid class AB amplifier. For reference, my rig: TIDAL Hi-Fi subscription played with AUDIRVANA, speakers and subwoofer ELAC Debut B6.2 and DAC S.M.S.L SU-9 paired with some very good RCA interconnects. Brings tears to the eyes :) My first A50 did sound good, but within two days it malfunctioned, developing hiss and crackling noise on the right channel, similar to what others have experienced here. After several days with support (the very helpful Martina), I returned it and tried again with another purchase. Now this second one *ALSO* arrived defective, but a minor defect - the front knobs were loose and fell off the unit when assembling! Being reasonably handy I fixed it myself, but boy I was pissed! However, all it took was to turn it on... and amazing does it sound!! After breaking in a few weeks, I hereby testify the sound is somewhat holographic, delicious - I can't really stop listening to it, which is the greatest compliment any audio gear manufacturer can get. So, in short, their factory QC (or the shipping process, whatever) is indeed poor and NEEDS improvement. TWO defective units in a row! But it was all worthwhile. It works beautifully and I strongly recommend the A50 over anything you can get on desertcart regarless of the price. After coming from decades of Denon and Onkyo AVRs, then the PSAudio's Sprout100 amplifier, then the INFI's class AB hybrid tube amplifier, and *two* A50's, I'm now settled. This is an amazing purchase, regardless of the inconveniences and nuisances. Buy it! Be aware and ready to return it (once or twice) if need so, but eventually you won't be dissatisfied (do not recommend for travellers and international buyers for this reason). To the manufacturer: you *REALLY* need to pull up your socks with your factory QC and your shipping gear. When it works, the quality of the product overcomes the hassles (it is THAT good), but not all customers may have the same tolerance. All that said, congrats for this amplifier. It is marvelous. Ed
Review: What an awesome sound - but what's even more awesome is TheTubeAmp store! - This product is sold on desertcart by TheTubeAmpStore. That's what I really want to write the review about - their service, honesty, prompt replies and quick turnaround on my repair amp which had a power transformer issue after 4 months of use. After I reached out, they replied within one hour. I described my issue and they sent me a shipping label. I boxed it up and sent it off. Four days later, Rick J. from the tech support team reached out, told me what my issue was and told me my options. Long story short, 10 days after I shipped it to them, it returned to my doorstep and was fixed 100% under warranty and has worked flawlessly for the last week. That was the most impressive customer service I've ever experienced in my many years in the HiFi hobby. Now the amp... it's so crystal clear. Yea, cliche, but the 300b tube sound is definitely more warm and slightly subdued. I have an Audio Space 2.8i (which costs more than this) which is a push/pull tube amp centered around the 12AX7 tube design. That ampo is also quite good, but it's very DIRECT and very dialed in. Kind of punchy, clear and more in-your-face sounding. And, the tradeoff is that it's kind of fatiguing. This amp (with the stock tubes) is anything but what I described. You won't get tired and dulled or over-stimulated senses from this amp. It's more mellow with the mids so smooth and warm. But, really, the biggest surprise was how wide the sound stage is. I didn't expect that. In my medium sized room it gets plenty loud and even turned up, no distortion at all. The sound seems to come from all around. I'm using them with vintage Klipsch speakers with a 95db efficiency rating. I've not tried them with anything other than these speakers...but I'm sure it'll be just fine with 88db rated speakers too. There's no hum or hiss at all. I use it to play my vinyl records. In between songs you cannot hear any surface noise. It also puts out plenty of bass. I have a subwoofer but I have not needed it with this amp. I think the stock tubes sound fine.... but after a couple months I read a lot of stuff where people have upgraded the 300b tubes with a pair of Genalex PX300B Gold Lion tubes. The are expensive (they start at around $420 for a pair of them). I didn't need them, but I wanted to just "hear" for myself what I was hearing about how these good these Gold Lion tubes were.... at this point I can say I will never buy another amp. I listen to a lot of jazz, acoustic music, indie rock and pop, old country and old school blues from the 1920s and 1930s. It all sounds great on this. The vocals are so clear and full. The knobs turn so smoothly smooth and the fit and finish is wonderful to look at. Even if you don't upgrade the 300b tubes, this will still sound great. These are only my opinions. I'm not an audiophile but heard how different the tube experience can be. Dang, no kidding. If you are considering your first tube amp - this will likely blow you away. If you are a tube guy already - maybe the 300b "tube reputation" has you wondering. I don't think you can go wrong with this especially at $849.

## Features

- Factory add an Inductance transformer and Bipolar filter circuit to get the nicer sound for the MKIII.Come with a Tube Cage and VU meters.
- Power output tube: 300B × 2 (Brand PSVANE)
- 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 | #55,830 in Electronics ( See Top 100 in Electronics ) #340 in Audio Component Amplifiers |
| Brand | BOYUURANGE |
| Date First Available | July 11, 2020 |
| Item Weight | 39.6 pounds |
| Item dimensions L x W x H | 14.76 x 11.42 x 7.09 inches |
| Item model number | BOYUURANGE A50 MKIII 300B |
| Manufacturer | BOYUURANGE |
| Material | Stainless Steel |
| Maximum Supply Voltage | 120 Volts |
| Minimum Supply Voltage | 110 Volts |
| Mounting Type | Surface Mount |
| Number of Channels | 2 |
| Output Power | 7.6 Watts |
| Product Dimensions | 14.76 x 11.42 x 7.09 inches |
| Specification Met | FCC |
| Voltage | 120 Volts |

## Product Details

- **Item dimensions L x W x H:** 14.76 x 11.42 x 7.09 inches
- **Manufacturer:** BOYUURANGE
- **Maximum Supply Voltage:** 120 Volts
- **Minimum Supply Voltage:** 110 Volts
- **Voltage:** 120 Volts

## Images

![REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage - Image 1](https://m.media-amazon.com/images/I/51yQqGyJKIL.jpg)
![REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage - Image 2](https://m.media-amazon.com/images/I/61nzPbs0FZL.jpg)
![REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage - Image 3](https://m.media-amazon.com/images/I/61A9gdTUJFL.jpg)
![REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage - Image 4](https://m.media-amazon.com/images/I/61Kl2FDoD4L.jpg)
![REISONG A50 MKIII 300B HiFi Intergrated Tube Amplifier Single-end Class A Valve Amp with Tube Cage - Image 5](https://m.media-amazon.com/images/I/51T2l+9FGpL.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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Audio quality = AMAZING (detailed, tubey); factory QC = POOR (crackling noise, loose knobs)
*by E***D on May 23, 2021*

AMAZING, nothing short of AMAZING, but not without its hiccups. This is my second A50 purchase, coming from the Sprout100 and the INFI hybrid class AB amplifier. For reference, my rig: TIDAL Hi-Fi subscription played with AUDIRVANA, speakers and subwoofer ELAC Debut B6.2 and DAC S.M.S.L SU-9 paired with some very good RCA interconnects. Brings tears to the eyes :) My first A50 did sound good, but within two days it malfunctioned, developing hiss and crackling noise on the right channel, similar to what others have experienced here. After several days with support (the very helpful Martina), I returned it and tried again with another purchase. Now this second one *ALSO* arrived defective, but a minor defect - the front knobs were loose and fell off the unit when assembling! Being reasonably handy I fixed it myself, but boy I was pissed! However, all it took was to turn it on... and amazing does it sound!! After breaking in a few weeks, I hereby testify the sound is somewhat holographic, delicious - I can't really stop listening to it, which is the greatest compliment any audio gear manufacturer can get. So, in short, their factory QC (or the shipping process, whatever) is indeed poor and NEEDS improvement. TWO defective units in a row! But it was all worthwhile. It works beautifully and I strongly recommend the A50 over anything you can get on Amazon regarless of the price. After coming from decades of Denon and Onkyo AVRs, then the PSAudio's Sprout100 amplifier, then the INFI's class AB hybrid tube amplifier, and *two* A50's, I'm now settled. This is an amazing purchase, regardless of the inconveniences and nuisances. Buy it! Be aware and ready to return it (once or twice) if need so, but eventually you won't be dissatisfied (do not recommend for travellers and international buyers for this reason). To the manufacturer: you *REALLY* need to pull up your socks with your factory QC and your shipping gear. When it works, the quality of the product overcomes the hassles (it is THAT good), but not all customers may have the same tolerance. All that said, congrats for this amplifier. It is marvelous. Ed

### ⭐⭐⭐⭐⭐ What an awesome sound - but what's even more awesome is TheTubeAmp store!
*by S***S on August 11, 2023*

This product is sold on Amazon by TheTubeAmpStore. That's what I really want to write the review about - their service, honesty, prompt replies and quick turnaround on my repair amp which had a power transformer issue after 4 months of use. After I reached out, they replied within one hour. I described my issue and they sent me a shipping label. I boxed it up and sent it off. Four days later, Rick J. from the tech support team reached out, told me what my issue was and told me my options. Long story short, 10 days after I shipped it to them, it returned to my doorstep and was fixed 100% under warranty and has worked flawlessly for the last week. That was the most impressive customer service I've ever experienced in my many years in the HiFi hobby. Now the amp... it's so crystal clear. Yea, cliche, but the 300b tube sound is definitely more warm and slightly subdued. I have an Audio Space 2.8i (which costs more than this) which is a push/pull tube amp centered around the 12AX7 tube design. That ampo is also quite good, but it's very DIRECT and very dialed in. Kind of punchy, clear and more in-your-face sounding. And, the tradeoff is that it's kind of fatiguing. This amp (with the stock tubes) is anything but what I described. You won't get tired and dulled or over-stimulated senses from this amp. It's more mellow with the mids so smooth and warm. But, really, the biggest surprise was how wide the sound stage is. I didn't expect that. In my medium sized room it gets plenty loud and even turned up, no distortion at all. The sound seems to come from all around. I'm using them with vintage Klipsch speakers with a 95db efficiency rating. I've not tried them with anything other than these speakers...but I'm sure it'll be just fine with 88db rated speakers too. There's no hum or hiss at all. I use it to play my vinyl records. In between songs you cannot hear any surface noise. It also puts out plenty of bass. I have a subwoofer but I have not needed it with this amp. I think the stock tubes sound fine.... but after a couple months I read a lot of stuff where people have upgraded the 300b tubes with a pair of Genalex PX300B Gold Lion tubes. The are expensive (they start at around $420 for a pair of them). I didn't need them, but I wanted to just "hear" for myself what I was hearing about how these good these Gold Lion tubes were.... at this point I can say I will never buy another amp. I listen to a lot of jazz, acoustic music, indie rock and pop, old country and old school blues from the 1920s and 1930s. It all sounds great on this. The vocals are so clear and full. The knobs turn so smoothly smooth and the fit and finish is wonderful to look at. Even if you don't upgrade the 300b tubes, this will still sound great. These are only my opinions. I'm not an audiophile but heard how different the tube experience can be. Dang, no kidding. If you are considering your first tube amp - this will likely blow you away. If you are a tube guy already - maybe the 300b "tube reputation" has you wondering. I don't think you can go wrong with this especially at $849.

### ⭐⭐⭐⭐ The most musical sounding amp ever. But needs upgraded tubes… and runs hot
*by M***U on January 27, 2026*

This amp sounds sublime. I had their a10 amp and was throughly impressed, so I decided to spring for this amp. It’s in another league entirely. Sound is deeper with mic more nuance. I would recommend changing out the stock input tubes with quality 6sn7 tubes. The stock tubes, while being able to do the job is holding the amp back significantly !!!! I put in some Linlai 6sn7 tubes annd horizon 274b rectifier tube and oh my goodness, I’m hearing sound quality that rivals 5k+ amps. Deep rich effortlessly layering in sound with some magic sprinkled on top. Only thing is that the amp runs hot!!!! The transformer gets hot enough to burn your fingers, so I put a small computer fan behind to keep it cool. I see why some people had failed amps, if it’s left on for consecutive days, it will melt components inside the amp!!! That’s how hot the transformer gets!!! Keep it cool and listen in bliss it’s worth 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

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-03-04*