The new 101D tube direct heating preamplifier, the frequency characteristic is 15-40KH. Residual noise 0.3MV

101D direct thermal preamplifier

1. This machine adopts a 12AU7 straight lotus-coupling push 101D cow output (20K: 600 ohms) method. The power supply part adopts electron tube (any tube with filament current within 2.5A such as 5Z2P) mixed with transistor, rectified, filtered by 513 choke, and then used as stabilized power supply.

2. The volume control potentiometer uses EIZZ 24 files 100K dual-channel high-quality stepping potentiometer (to ensure the consistency of channel separation and volume control). Connecting line Xidian oil wax wire, filter Xidian 513C capacitor and some antique resistors, etc. The 101 working voltage is 120V, and the current is 8MA per tube.

The production of this machine is basically done by hand, so it may be slightly flawed, so those who mind should be cautious to buy it, so as not to cause unnecessary trouble.

3. Frequency characteristic 15H-40KH-2DB. The residual noise is 0.3MV.

4. The sound quality of this machine is clear and transparent, the channel separation is high, and the sound is soft and durable.

5. The size of the whole machine is 320*70*260, and the weight is about 9 kg.

6. The price of this machine does not include all the tubes.