• 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.

Cheap 300B project

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waltube

waltube

Member
Joined 2005
So the Vdc of the circuit is 350 Vdc, less or more.
Which is the value of Resistor that comes from Vdc of the entire circuit?
If we can reach about 400 Vdc for the 6SL7 we can get around 2 volts at each cathode that is better.
What you feel about sound now?

Walter
 
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2stuffed

Member
Joined 2016
Thanks Walter and everyone for your help and knowledge, I'm very happy with the sound .
 

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woodo

woodo

Member
Joined 2018
circuit for kit amp

2stuffed said:
Hi everyone, I just finished a amp using a cheap Chinese PCB kit. It works ok but hasn't got much volume or bass until I turn it up to max on the pot.I'm not skilled enough to work out whats wrong .I have no readable schematic, just one from the description online. I've attached a pic , maybe someone might be able to help.

thanks
Click to expand...
i am about to build a similar kit from happyshop1982? but have low skills as a noob and will get everything checked. i couldn’t reconcile the circuit provided with the parts. so i had a go at tracing out the circuit from the pcb. i might have made a mistake with the input as i had trouble seeing how the capacitor and resistor were connected. i’ll post it if i can.
 
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