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27 driving 2A3/45/ or 300B
27 driving 2A3/45/ or 300B
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Old 22nd December 2009, 05:26 PM   #1
jmillerdoc is offline jmillerdoc  United States
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Default 27 driving 2A3/45/ or 300B

Looking for a good schematic for a single ended 2 tube circuit with a #27 tube driving a 45, 2A3, or 300B.

Anybody know of anything?

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Old 22nd December 2009, 05:34 PM   #2
kmtang is offline kmtang  Canada
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Hello Jeff,

The gain factor of 27 is only 9 with plate impedance of 9K. You would need to use two of them cascaded to drive the 45 or 2A3. I don't have a schematic handy for you but it should not be too difficult to work on one.

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Old 22nd December 2009, 07:23 PM   #3
serph1nia is offline serph1nia  Netherlands
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1. You will need a medium mu preamp/input tube
2. You will need to bring the impedance down.
You can use some sort of mu-stage. Or 2:1 transfomer, this will devide the impedance by 4.

Probably a better choice would be to use the 27 as a preamp and something else as the driver.
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