OTL Power Amplifier Kit Plastic Sealed Tube Large Size DIY Nostalgic Discrete Component Board | Обустройство дома

OTL Power Amplifier Kit Plastic Sealed Tube Large Size DIY Nostalgic Discrete Component Board | Обустройство дома

The original circuit diagram is80The audio power amplifier circuit of black and white TV in's，This power amplifier circuit was jointly designed by the whole country at that time，

It's our countryOTLPower amplifier circuit is very classic、A circuit with excellent performance。

Board size10*7CM

recommend：use48VInternal power supply, 48VThe power amplifier tube is very hot，The current is loud。

For large electrolysis2200uF，It's too small，There is no bass。 3300Pchange330P，use3300There is no treble。

On the circuit10European100Europe。use100European sound field width。The board doesn't pick the pipe，No pairing，The sound quality is still good！

Power tube can use field tube，Nice, mellow。It's going to be a cheap component，The sound quality of the equipment！

The original circuit diagram is80The audio power amplifier circuit of black and white TV in's，This power amplifier circuit was jointly designed by the whole country at that time，As shown in the figure below

IfQ5，Q6Plastic sealT220In the case of encapsulation，Output power in3－10Between tiles，Perfect for near field listening，For simplicity，Directly on the board，A lot of multiple leads are missing，If you need more power，On boardQ5,Q6No need to install，Choose large plastic or gold seal pipe，Directly through2,3,4,6,7,8External installation, At the same time, increase the supply voltage，The results are satisfactory

Quasi complementary circuit is used in the schematic diagram，If we willR17rotate30DudaoQ4Ofeextremely，that isPCBOn boardBspot，Q5，Q6We need to use complementary management，At this point, the circuit is the standard complementary circuit。

IfQ5，Q6Field management，W2(If the output is a transistor，It's directly here4148Just replace the diode，It's only used by the tube), R16，R17It will come in handy，Yes50 － 1KIt's worth playing。

If you don't mind?pcbPolarity of icons on board，If power is supplied，diode，triode，The polarity of electrolysis is reversed，namelypnpIt's too rigid, We can play3ADOr something like that, Play germanium tube power supply best in24vfollowing。

We can use silicon tubes in front of the circuit，Replace power tube with germanium tube,This is how Europe plays,Germanium tubenpndifficult to find，Poor performance。

Germanium tube is known as the sound of gold and stone，Physically speaking, it's high-frequency，Hearing tolerance，Low on voltage，Low pressure and high efficiency,Listen to people's voice, It's better to listen to radio crosstalk storytelling with germanium tube ，Some tracks are played on it，It may not work, OK, you can have a try。