Another wonderful design from Mr Fujita - TU-8550
You can view and listen TU-8550 PREAMPLIFER in the coming -
Tube Preamp Kit TU-8550
PRICE : $1,175.00
JJ 12AX7 X 4
JJ 12AU7 X 2
[Circuit configurations, stock tubes]
Flat amp (line amp) : 2x 12AX7, 1x 12AU7, SE input/output
Phono equalizer amp : 2x 12AX7, 1x 12AU7, CR type, RIAA equalizer amp
A-power : DC-power (all tubes)
B-power : MOSFET, slow start, constant voltage power
* Line AMP *
Unbalanced output, continuously variable gain
[Max. output voltage] (1kHz)
Over 30V rms (Volume at the max.)
[Max. gain] (Volume at the max.)
Approx. 17dB (approx. 7 times)
[Frequency response] (-3dB, 47kΩ load) 5Hz to 200kHz
[Residual noise] (IHF-A)
15μV (Volume at the max.)
6.5μV (Volume at the middle)
4.3μV (Volume at the min.)
[SN ratio (IHF-A)]
130dB (Volume at the middle)
126dB (Volume at the max.)
* Equalizer amp *
[Max. output voltage] (1kHz) 20V rms (1kHz)
[Gain (1kHz)] 29dB
[SN ratio(IHF-A)] 112dB
[RIAA equalization] Within ±0.5dB (20Hz to 20kHz)
[Input resistance] 47kΩ
* General *
[Input/output terminal / Input and output impedance]
PHONO IN：RCA jack, for MM cartridge, 47kΩ
LINE IN： 4 lines
LINE 1, 2, 3 : RCA jack, over 50kΩ)
LINE 4 : 3.5mm stereo phone jack (front), approx.12kΩ)
PRE OUT：RCA jack, 2 lines (parallel output), approx.1.1kΩ
REC OUT：RCA jack, 1 line, approx.2.4kΩ for PHONO
Output impedance of the sound source + 1kΩfor LINE IN
[Power voltage] AC 100V 50/60Hz
(For overseas, 115V(110 –120V) or 230V(220 –240V), 50/60Hz)
IEC standard, 3P inlet type
[Rated power consumption] 23W
[Dimensions] W352 x H66 x D298 mm (including projections)
[Weight] Approx.4.0kg (Assembled, excluding AC cord)
4X VCAP 0.47 CuTF (option )
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It is hard to tell you the prce of the upgrade at this time
I will order a lot to lower the price...
4 x Vcap CuTF 0.47
OR 4 X Vcap ODAM
12AX7/ECC83/7025 x 4
12AU7/ECC*2/6067 x 2
I will order a lot to lower the price...
4 x Vcap CuTF 0.47
OR 4 X Vcap ODAM
12AX7/ECC83/7025 x 4
12AU7/ECC*2/6067 x 2
Last edited:
Nice! any further info on the volume pot, or whether it might be able to fit a remote controlled one?
Wait.... Victor....where are the tubes ? Very colorful tube covers 🙂
Looks very interesting, very interested in the phono. Put me down for one.
Looks very interesting, very interested in the phono. Put me down for one.
THe BIg ALPAS is good.. more space to do your experience
IF I can get JJ tube, I will use JJ tube for this project.
IF I can get JJ tube, I will use JJ tube for this project.
I would be interested if this could be modified to use a remote volume.
Very nice pre-amp 🙂
Could you please ask the designer why the need for a 4-gang volume potentiometer in a single-ended input amplifier??
Could you please ask the designer why the need for a 4-gang volume potentiometer in a single-ended input amplifier??