You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

The 2879 was an impressive transistor when it came out. It was while building current limiting protection circuits for these transistors that I learned something very revealing. The current limit to keep a single ended transistor within its Safe Operating Area was exactly the same as with a pair in push-pull.

Both the single ended and push-pull circuits had to remain below 25 amps or the transistors burn open. That told me the pair in push-pull, could not support any more input current than one device. Therefore, the DC input power and RF output power of the pair in push-pull, cannot reach levels beyond a single ended, resonant circuit.

[QUOTE="Shockwave, post: 676337, member: 10882"] The 2879 was an impressive transistor when it came out. It was while building current limiting protection circuits for these transistors that I learned something very revealing. The current limit to keep a single ended transistor within its Safe Operating Area was exactly the same as with a pair in push-pull. Both the single ended and push-pull circuits had to remain below 25 amps or the transistors burn open. That told me the pair in push-pull, could not support any more input current than one device. Therefore, the DC input power and RF output power of the pair in push-pull, cannot reach levels beyond a single ended, resonant circuit. [/QUOTE]

Top Bottom