Chinese FU32

[Kjeldsen]

Is it any good
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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

 

[PRR]

> Is it any good ........ I just think it look Uber cool.

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

 

[Kjeldsen]

Looks means a lot to me, especially if it's also some kind off odd looking. But it also needs to work

 

[JonSnell Electronic]

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!

 

[Kjeldsen]

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

 

[tomtt]

> 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.

 

[Kjeldsen]

ACF 12Vac Tube Stereo Buffer

Maybe an option if it can drive the low input impedance of my Pascal spro2 modules

 

[Mark Tillotson]

Highly dangerous too, you can see the anode cap connections are not fully protected from
prying fingers - this is a child-killer.

 

[pcan]

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.

 

[Mark Tillotson]

For lower power the QQV03-10 dual-tetrode (near equiv. 6360) avoids anode caps, being standard 9-pin.

 

[PRR]

Highly dangerous too, you can see the anode cap connections are not fully protected from prying fingers - this is a child-killer.

I strongly suspect there isn't even 12V on those.