We can - but it adds tons to the price. The problem is volume. If you are shifting enough boxes you can lower unit costs and pay for that sort of engineering - although usually these days still end up shoving it out to China to do at 1/5th the price because our workers get more than a bowl of rice . Here is an example of one done properly - 13 made, 11 sold, company folded immediately afterwards - UK market impenetrable and locked up by other brands
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I'll open another thread about valve amplifiers