Some of you might have one of these Zero Zone Chinese preamplifiers. I picked up a used one yesterday and I was surprised to see the indicator LEDs for the four sources and the power standby were on the inside of the cabinet....Out of view!...I modified that situation right quick. Too mush info and pictures for here so I posted a short article on my web page....www.rvbprecision.com
No, I wish I did.....But these Chinese products are all over the map for build consistancy. This Preamp doesn't have a model number on the unit or on the box...And "Zero" owners manual...😊... The only place there is a model number is on the main PCB....And if you google that model, a whole bunch of preamps pop up that all look alike outside, but if they offer an interior photograph, you can see different components and even different topography. Messing around with some of this Chinese stuff is an adventure in itself. But for $200 that I paid for this used amp...I'm having a blast with it. And it sounds fantastic with my PASS First Watt F5 v2 and Magnapan MMGs....
TRANSLATION:
Zhe Luo-old burning is playing: PRT05A vacuum tube pre-stage kit-reference poetry drunk CL circuit (bile pre-stage)
This kit needs to be welded by the player and does not contain a vacuum tube. Please prepare or purchase the kit by yourself
PRT05ARefer to Shizui CL circuit, the design adopts double single independent design, 100% physical separation of left and right channels, and independent graded grounding
PCB size: 144*178*1.6MM, spray tin process
PCB integrated high voltage voltage regulator circuit (260VDC) and filament voltage regulator circuit (6.3VDC)
This version is only suitable for 12AX7, 12AU7, 12AT7, 12AX7 is recommended
Note: In the filament power supply, the vacuum tube of this design is 4-5 pins in parallel, and 9 feet are grounded, so it is only suitable for vacuum tubes with 12V power supply.
Power requirements:
High voltage 200-220VAC, two groups are required, each group is not less than 10MA
Filament lamp 6.3VAC-7VAC, need two groups, each group is not less than 750MA
This shop has a matching 35VA R type transformer for players to choose
Circuit diagrams and bills of materials are not only uploaded, it is recommended to download into the group
It’s not as good as the others, and it’s more fun to join the group and communicate.
Zhe Luo-old burning is playing: PRT05A vacuum tube pre-stage kit-reference poetry drunk CL circuit (bile pre-stage)
This kit needs to be welded by the player and does not contain a vacuum tube. Please prepare or purchase the kit by yourself
PRT05ARefer to Shizui CL circuit, the design adopts double single independent design, 100% physical separation of left and right channels, and independent graded grounding
PCB size: 144*178*1.6MM, spray tin process
PCB integrated high voltage voltage regulator circuit (260VDC) and filament voltage regulator circuit (6.3VDC)
This version is only suitable for 12AX7, 12AU7, 12AT7, 12AX7 is recommended
Note: In the filament power supply, the vacuum tube of this design is 4-5 pins in parallel, and 9 feet are grounded, so it is only suitable for vacuum tubes with 12V power supply.
Power requirements:
High voltage 200-220VAC, two groups are required, each group is not less than 10MA
Filament lamp 6.3VAC-7VAC, need two groups, each group is not less than 750MA
This shop has a matching 35VA R type transformer for players to choose
Circuit diagrams and bills of materials are not only uploaded, it is recommended to download into the group
It’s not as good as the others, and it’s more fun to join the group and communicate.