Today, a customer asks us if we can increase the value of the class A tube rectified power supply capacitors for his custom made amplifier significantly so that he can get a better power supply with low ripple and deep excellent bass?
In his ordered design, we only chose values from 4UF to 100UF maximum for his 300B amplifier. He was questioning us why it is so low. He saw at least 220UF to 470UF in other designs, sometimes even 1000UF on some designs. If we use 100UF, will the bass be weaker compared to those with more capacitance?
What do you think? Do you use big capacitors and it equals to a great power supply?
We are sorry to tell you that it is a WRONG assumption. Huge capacitance does not equal to good power supply. Huge capacitance makes the bass weaker and looser due to the slow recovery time to charge the capacitors once the charge is used up.
What is important in class A tube amplifier power supply is to have a critically damped supply with excellent transient response with just sufficient capacitance to low the power supply ripple to an inaudible level.
Less is actually more! That's what we do with our power supplies. That's one of the things that separates us from others. You will find that our bass are taut, deep and fast! No woolieness!
J&K Audio Design