Variable overlap drive

[ocdecio]

Anyone have any idea what thiat means? I've seen this expression used in many model brochures.

 

[Blue Shadow]

Might be a changing bias. Overlap is standard in a transistor amp that is true class A. But that overlap is set by bias. Someone that knows circuitry and the 500 will bring the real answer soon enough.

 

[dankik]

Here is a brief description from a Model 19 brochure:


More:

 

[ocdecio]

Here is a brief description from a Model 19 brochure:

Thank you, Yes I've seen these descriptions but what exactly is the circuit they refer to? Is that the bias temperature compensation circuit?

 

[Lavane]

Transistors or dual diode packages in the bias circuit attached to the heatsink?

 

[dankik]

OK, you asked for it! Here is the patent Marantz filed that describes the Variable Overlap Drive invention. (see attached document) Filed in 1969, patented in 1971. It looks like it is a circuit (method) to vary the amount of Class AB waveform overlap to minimize distortion. See highlighted sections, or read the whole patent.

 

[ocdecio]

OK, you asked for it! Here is the patent Marantz filed that describes the Variable Overlap Drive invention. (see attached document) Filed in 1969, patented in 1971. It looks like it is a circuit (method) to vary the amount of Class AB waveform overlap to minimize distortion. See highlighted sections, or read the whole patent.

This is great, thank you!!

 

[hofferwood]

Thanks @dankik, good read (the patent).