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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Chinese FU32
Chinese FU32
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Old 22nd May 2020, 08:08 PM   #1
Kjeldsen is online now Kjeldsen  Denmark
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Default Chinese FU32

Is it any good
#Aliexpress US $63.19 21%OFF | Nobsound Mini FU32(832A) Valve Tube Amplifier Hi-Fi Stereo Preamp Desktop Tube Headphone Amp
Nobsound Mini FU32(832A) Valve Tube Amplifier Hi Fi Stereo Preamp Desktop Tube Headphone Amp|Amplifier| - AliExpress

I don't have a specific purpose. I just think it look Uber cool. Could it be used as a buffer for pascal spro2 module. Or only as headphone preamp? I also have have a Kt120 class A amp that also need some fun stuff
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Old 22nd May 2020, 11:48 PM   #2
PRR is online now PRR  United States
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Chinese FU32
> Is it any good ........ I just think it look Uber cool.

Who cares if it works at all?? It IS uber-kewl.

Last edited by PRR; 22nd May 2020 at 11:51 PM.
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Old 23rd May 2020, 06:38 AM   #3
Kjeldsen is online now Kjeldsen  Denmark
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Looks means a lot to me, especially if it's also some kind off odd looking. But it also needs to work
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Old 23rd May 2020, 07:26 AM   #4
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Reading the blurb, translated from Chinesium, it is very susceptible to noise from phones, switchgear and motors.
Not a lot of good for a pre amp!
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Old 23rd May 2020, 07:31 AM   #5
Kjeldsen is online now Kjeldsen  Denmark
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I also see it have an op amp in the circuit. Most likely for input instead of tubes. I assume it's more looks than quality sound.
If anybody know a simple silent tube buffer with low zout, then feel free to put in a link. I don't mind soldering, but I also don't mind if it's ready made
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Old 23rd May 2020, 07:33 AM   #6
tomtt is offline tomtt
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Quote:
Originally Posted by PRR View Post
> Is it any good ........ I just think it look Uber cool.

Who cares if it works at all?? It IS uber-kewl.
Agreed

Modern sculpture.
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Old 23rd May 2020, 08:30 AM   #7
Kjeldsen is online now Kjeldsen  Denmark
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ACF 12Vac Tube Stereo Buffer

Maybe an option if it can drive the low input impedance of my Pascal spro2 modules
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Old 23rd May 2020, 11:56 AM   #8
Mark Tillotson is offline Mark Tillotson
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Highly dangerous too, you can see the anode cap connections are not fully protected from
prying fingers - this is a child-killer.
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Old 23rd May 2020, 03:49 PM   #9
pcan is offline pcan  Italy
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Chinese FU32
The anode connection on FU32 chinese kits is scary. The wire itself is almost always a thin low-voltage, low-temperature wire because it must fit inside the holes on that ceramic base; the insulation will melt or crumble after a while. The most common anode supply on this kind of circuits is 250V only, so the ceramic cap is not needed at all. I use a bare Molex crimp connector wrapped in fiberglass reinforced tubing, and the wire is a 1000V, high temperature type.

By the way, FU32 / 832A is a fun tube. I have built a 3+3w single ended amplifier mostly for the way it looks. I haven't found any sonic advantage over a conventional 6V6 build, and there is the added issue of a concentrated heat source. But I can ensure to Kjeldsen that this tube, with filaments turned on, is even more cool looking than the linked picture. The amplifier referenced on post #1 looks to be badly engineered and does have poor ratings, but there are several better kits and prebuilt amplifiers from China. They look to be more expensive than sourcing two Hi-Fi 5W output transformers from a reputable manufacturer, a genuine RCA 832A tube, a dual triode, and the few more parts required by the schematic. Maybe I will try a 829B next time.
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Old 23rd May 2020, 05:11 PM   #10
Mark Tillotson is offline Mark Tillotson
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For lower power the QQV03-10 dual-tetrode (near equiv. 6360) avoids anode caps, being standard 9-pin.
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