• Disclaimer: This Vendor's Forum is a paid-for commercial area. Unlike the rest of diyAudio, the Vendor has complete control of what may or may not be posted in this forum. If you wish to discuss technical matters outside the bounds of what is permitted by the Vendor, please use the non-commercial areas of diyAudio to do so.

FU-50 12Wx2 hifi tube amplifier kit

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Jump to Latest
S

siliconray

Member
Joined 2011
Product Link:
FU-50 HiFi 12Wx2 SE tube audio amplifier

If you think 6P3P amplifier is not loud enough, or it's too simple for you, this FU-50 kit is for you. FU-50 is know as "little 300B", because it's sound like famous 300B.

This kit use 6j8p or 6n8p as preamplifier. It can output 12W x 2 power, lound enough for a big room.

Features and spec:
5Z3P tube rectifier
6J8P preamplifier
FU-50 power amplifier
Output Power 12Wx2
Load: 4Ohm or 8Ohm
Silkscreen stainless steel chasis

Part List
Tube and socket
- 8Pin tube socket x 3
- FU-50 socket x 2
- 5Z3P x1
- 6J8P x 2
- FU-50 x 2
Capacitors
- 450V/330UF x 1
- 400V/47UF x 1
- 400V/22 UF x 1
- 0.47UF film x 2
- 35V/470UF x 2
- 100V/100UF x 2
Resistors
- 39K 3W x 1
- 220K 3W x 1
- 1K 3W x 4
- 470K 3W x 6
- 680Ohm 3W x 2
- 100K x 2
- 100Ohm x 2
- 4.7K x 12
Accessories
- Silkscreen stainless enclosure
- 150W power transformer
- 3.5K to 4/8 ohm OP transformer x 2
- 2H 250ma choke coil x 1
- RCA connectors x 2
- Power switch x 1
- Output Connectors x 6
- Cables
- Shrink tubes
- Shielded cables
- Rubber foot x 4
- Wiring cables
Schematic
An externally hosted image should be here but it was not working when we last tested it.

Product Images
An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Related Products
6P3P 7Wx2 Single End Amplifier Kit
6n9p+EL34B SE 13Wx2 Hifi Tube Amplifier kits
6j4+6p6p+6z5p HiFi Tube Preamplifier Kit
FU-50 Single End 12W x 2Tube Amplifier Kit
 
C

costis_n

Member
Joined 2008
siliconray said:
A few years before a man (a guru of tube amplifier) wrote an artical about 300B and FU-50. In the artical he mentioned that the curve of FU-50 is very close to 300B when working in troid mode. THat's why it's called little 300B, very interesting.
Click to expand...

The FU50 (which is the chinese version of GU50) looks nothing like the 300B, but still it is interesting. So you understand that a link to that article is in order. Also, there is no way that you are getting 12 Watts from a FU50 , in triode connection with 310Volts. Look at the curves! 12 watts from a GU50 is with 550Volts, pentode mode. I am working on such an amplifier.
 
S

siliconray

Member
Joined 2011
Hi Costis

The aritcal is published on a magazine. I'll try to find it. But I don't think you can read it in Chinese.

Thanks for figuring out the max power problem. I also realized that the 12W is impossible. I'm quite new to tube. Actually I knew little about tube before involved in this business. the 12W is just copied from the supplier's words. The supply voltage is about 340V, the max power should be around 8W according to my calculate, am I correct?
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Top Bottom