Ritteri, I have never had my top off so i was just going by this quote from Mondial Designs'
"The true replacement for the 4004 was the 8008BB. However, the 8008 BB also incoporated 50% more output transistors, twice as much power supply capacitance, and the balanced input stage. The difference between the 8008ST and 4004 is that the 8008ST used a single, "dual-wound" transformer for the power supply while the 4004 has the separate transformers. The 8000 series amplifiers also added the DC servo circuit for flat operation down to 5 Hz."
Adam Gershon
Mondial Designs