• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

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Transformer coupled line stage revisited - triode connected 6F6Gs + Hashimoto HL20K6

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Intact Audio Nickel AVC + line stage preamp
 
my work..
 

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2nd part
 

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I am always pleased to see that we can not only make something, but make something beautifully. So much work goes into a project. When you are done it isn't something that you want to make excuses for. Even better is when you may make a mistake and can turn it into an improvement. The harder thing for me to do is start over and scrap the front panel or whatever has no chance at looking right.
 
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In Norway we call them sleeves. When you use many stranded conductors, it sometimes gets a bit messy because of these small copper wires. Then they use sleeves, which are small tinned copper tubes that are placed around all the copper wires, and with the help of a sleeve pliers, the copper tube will wrap around and it will be a solid connection. Aluminum is never used in this type of construction, is it? If you don't use sleeves, theoretically there will be a small spark between each copper wire, which can create heat ... Unpractical to use aluminium wires. Alu are very soft and difficult to connect in connectors seen on PCB-s, because they are made for cu.wires.
 
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Hi, here my first finished tube power amplifier, parallel single ended with active loaded output stage
 

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This EL34 single-ended valve amplifier has been a labour of Love for me. I handcrafted it using the best components I could afford. All wiring is done point-to-point. I also did the copper metalwork and woodwork myself, except for the volume knob and feet. The amplifier is switchable between ultra-linear pentode and triode operation. The negative feedback is also switchable.

Dedicated to Sanātana Dharma and all my Loved ones who've passed on.

The underside of the amplifier has the cooling holes hand-drilled in the design of a Mandala, one has the Aum sign in it and the other a Swastika.

Braille is written in Hindi and English and reads "Honouring God and all my Ancestors".

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