[Dobrescu George]

From their official website:

APR 204

The launching of the vacuum tube stereo power amp Qualiton APX 200 entailed the demand for developing a thoroughly classic vacuum tube preamp. The vacuum tube preamp Qualiton APR 204 is meant to meet this demand by not wanting to seem to be more than it is: it is in fact one indispensable element of the sound chain which was developed based on clear guiding principles and is able to evoke the classics of tube electronics.

At the same time, three audio sources with line level output signals as well as one signal source with MM phono output signal level can be connected to the RCA connectors at the rear panel. With the help of the audio source selector switch at the front panel, the user can determine, out of these four audio sources, which one of the relay-switched, volume-controlled signal should reach the output RCA connectors.

If the input selector unit is in ‘P’, i.e. PHONO position, the signal to be processed gets on the grid of the first voltage-amplifying vacuum tube through RCA connectors marked PHONO - thus, through the shortest possible signal paths. From here, in the before-mentioned classic way, the signal component gets on the grid of the second voltage-amplifying stage through a passive correction network between stages according to RIAA standard, realised exclusively with passive elements. We use both in the first and in the second voltage-amplifying stage double triodes ECC83/12AX7. Through an appropriate tuning circuit and volume control potentiometer, the output of the PHONO stage is connected to LINE stage, consisting of double triodes E88CC/6922.

Warranty: 2 years (6 month for tubes)

User's manual

• TECHNICAL PARAMETERS

• Name	Value
  Nominal output level - Line	2 V
  Input sensitivity - Line	500 mV, to nominal output level
  Input sensitivity - Phono	5 mV, to nominal output level
  Number of input ports	3 unbalanced input per channel, 1 MM-level input per channel
  Number of output ports	1 balanced/unbalanced line level output per channel, 1 headphone output per channel
  Max. input signal - Line	7 V
  Max. input signal - Phono	200 mV
  Gain - Line	+12 dB
  Gain - Phono	+52 dB, (f = 1 kHz)
  Total harmonic distortion - Line	< 0.05%, (f = 1 kHz, input level: 500 mV)
  Total harmonic distortion - Phono	< 0.5%, (f = 1 kHz, input level: 5 mV)
  Frequency response - Line	4 Hz - 300 kHz, (-1 dB)
  Frequency response - Phono	20 Hz - 20 kHz, (-0.3 dB)
  Input impedance - Line	100 kOhm
  Input impedance - Phono	47 kOhm
  Signal-to-noise ratio - Line	> 100 dB
  Signal-to-noise ratio - Phono	> 70 dB
  Tubes required	4 x ECC83/12AX7; 2 x E88CC/6922
  Weight	8.4 kg
  Dimensions	43 x 10 x 32 cm

Some photos too:









Currently waiting for reviews and more articles about it coming online too

I am not affiliated, just made a thread about it btw. I will review it in the near future, but that is all the connection I have with the company.

 

[Dobrescu George]

It is weekend, so it is time for a high-end review, this time about the Qualiton APR204 Preamplifier from Audio-Hungary!! This is truly a high-end device, with a beautiful sound, excellent reliability, and as other reviewers have pointed out, good circuit construction inside!!

I do an in-depth comparison with other Preamplifiers, but also explain where this one would come in handy, and why you might want it inside your system, especially if you're running a high grade stereo!

It can do its magic for a headphone setup too, but only if you like having a larger, more complex setup~

https://www.audiophile-heaven.com/2021/06/qualiton-apr-204-preamplifier-rev-my-engine.html