12AX7 Tube Op-Amp Design: Achieving Gain of 1500 in 3 Stages with 10V Plate Voltage

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#1 21675390 11 Feb 2016 16:32

Raymond Hernandez Raymond Hernandez

Anonymous

Post #1
21675390 11 Feb 2016 16:32

I'm planning to build a discrete op amps using 12ax7 tubes with gain of 1500. Please let me know if this is possible. I'm planning to make it in 3 stages (50x10x3). Plate voltage at 10v only.

Thank you.
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#2 21675391 11 Feb 2016 20:13

Kevin Angelo Ma Kevin Angelo Ma

Anonymous

Post #2
21675391 11 Feb 2016 20:13

Hi,

I believe that is possible, I have seen a circuit of an OPAmp made from a vacuum tube. An op-amp is essentially a high-gain differential amplifier. Maybe as long as you maintain the gain, it would be just fine.
#3 21675392 11 Feb 2016 22:32

richard gabric richard gabric

Anonymous

Post #3
21675392 11 Feb 2016 22:32

The first "op amps" were tube based, I refer you to the K2-W made by Philbrick in 1952.
See this web site
http://www.philbrickarchive.org/
Cheers,
Richard
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12AX7 Tube Op-Amp Design: Achieving Gain of 1500 in 3 Stages with 10V Plate Voltage

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