1969 Class A amplifier

Because the author wanted to use it to keep warm in winter, he created this doge.
Back to the topic, because I wanted a Class A power amplifier, but after taking a walk around, I found that many Class A power amplifiers were designed to show that they are very "hifi". It uses fully direct plug-in components and a metal shell (gold seal) triode design. It seems that there are shackles in the audiophile world of "direct plug-in means hifi" and "gold seal means hifi".
So I raised two philosophical questions to myself. :
1. Why do we have to use direct plugs when we can obviously use patches instead? Is there really a big difference in sound quality between chip resistors and in-line resistors?
2. There are obviously high-quality and low-priced plastic packages, why do we need those expensive and explosive metal casings?
In order to break these two constraints, after careful consideration of the circuit, I discovered that the in-line resistors could be replaced by chip resistors, and I also found some iron-cased tubes that could be replaced, so I used my kindergarten-like art skills to draw This board (doge) came out.
Compared with those on the market, this 1969 Class A power amplifier board uses high-quality and low-priced chip resistors and plastic-encapsulated transistors. Even so, the voice that came out was still so pure, like the pure voice of a child.
I also added a lot of Nichicon capacitors (I originally planned to use WIMA for the coupling capacitor. After thinking about it, Nichicon is better (doge)), and connected the power supply as a whole (I used a 100W ring ox and 40000μF capacitor group, using 10A10 rectifier) ​​cost It costs no more than 150 yuan, which is quite cheap and has pure sound quality. For these reasons, even though the idea of ​​​​"tube amps only hifi" is now popular, the 1969 Class A amplifier still attracts a group of followers.
However, one thing worth noting is: since the power tube of the Class A power amplifier is always in the maximum power state, even when there is no signal input, it is running at the highest power, so the heat generation is extremely high, so pay attention to fire safety!
Attached is a test video portal: https://www.bilibili.com/video/BV1E8411Y7dd