PREdator, Diff/CF linestage.

jane · 16th December 2005, 09:19 AM

PREdator, Diff/CF linestage.

The object for this preamp is to keep things simple, with a gain of 10dB, and quite low Zout.
The input stage is a diff-amp, like a LTP. The gain in that stage is about 18dB. The line driver is a cathode follower with a bit NFB back to the inverting input of the diff-stage. Overall gain is estimated to be 10-12dB.

Zout is something like 1/gm (12J5) in parallel with 22k, plus some contribution from the NFB. Perhaps I am going to use ½ 12SN7 instead of two 12J5...

The power supply is also quite strait forward, C-R-C for B+, C-L-C for C-, and DC for heaters. Maybe I will use a solid-state regulator for 12VDC. What are yours experience with regulators (7812 etc) for heaters in preamps?
Any other comments?

Preamp:

Power supply:

16th December 2005, 09:19 AM	#1
jane diyAudio Member Join Date: Jul 2004 Location: Norway	PREdator, Diff/CF linestage. PREdator, Diff/CF linestage. The object for this preamp is to keep things simple, with a gain of 10dB, and quite low Zout. The input stage is a diff-amp, like a LTP. The gain in that stage is about 18dB. The line driver is a cathode follower with a bit NFB back to the inverting input of the diff-stage. Overall gain is estimated to be 10-12dB. Zout is something like 1/gm (12J5) in parallel with 22k, plus some contribution from the NFB. Perhaps I am going to use ½ 12SN7 instead of two 12J5... The power supply is also quite strait forward, C-R-C for B+, C-L-C for C-, and DC for heaters. Maybe I will use a solid-state regulator for 12VDC. What are yours experience with regulators (7812 etc) for heaters in preamps? Any other comments? Preamp: Power supply: __________________ Life is hard - Then you die.

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