This is a usable analog preamplifier HiFi (after a few improvements).
Simple manual, obvious connections
No staining but various noises (bad bad power transformer and filtered)
It can be improved very easily, in which case it becomes great:
- Change the voltage by an impregnated model (planar transformer primary side 2 x 115 V 2 x 18 V 18 VA Spitznagel SPF SPF 1,831,818 1,831,818).
mount the transformer on small foam pads
- Change the filter capacitors by 600 μf/50v.
- Replace the original op amps by NE5532P (4)
- Thoroughly check all welds of the device (it's made in China).
total cost of changes: 25 euros with shipping!
The sound becomes perfect: more noise, more breath and RIAA entry worthy of the name
very good buy if small modifications, simple but thorough is performed
The next step in customization will be the replacement of all chemicals and other knobs and switches capacitors,
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Jr@'s review (This content has been automatically translated from French)
I use to pre-amp for 2 years he can use my sound system as string Hi-Fi easily.
It possde input anx 4, cd, tuner, phono, input / output for a recorder or other platinum K7, there is also a microphone input mixable. SETTING THE The volume is large but not too prcis beyond mid power.
Sensitivity of impedance between
1mV micro 3Kohm thd 0.02% S / N 70dB
phono 3mV 47kohm thd 0.04% S / N 90dB
machine 150mV 22Kohm 0.01% THD S / N 100dB
used as a hi-fi amp btte
between mic for karaoke
The 3-band equalizer is handled with dousseur because it is a little too straight forward as I got lonrdenss function. The function is handy kut low for vinyl. The amp RIAA is correct and does not stain like the pre-amp gnral.
_ Tranfo vibrates and makes some noise
_ Equalizer lourdenss tops and nag
_manque one or two supplmentaires input (TV, VCR ...)
_ Unique product in this price range
_ 2 RCA 1 XLR
_ Trs quality sound right no breath and no audible distortion