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2 tube oscillator and buffer circuit




 
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Author Topic: 2 tube oscillator and buffer circuit  (Read 460 times)
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W4RFM
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« on: January 10, 2019, 06:02:12 PM »

Does anyone have a favorite 2 tube oscillator and buffer circuit? I am thinking I saw a 6AG7 and a 6L6 circuit, that would be used with a crystal, to drive the input stage of my future AM rig.  I only need 5 watts or so.
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BOB / W4RFM
W9ZSL
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« Reply #1 on: January 10, 2019, 07:53:38 PM »

Go to the good old 2-tuber in the '49 handbook. Here's the one I built a few weeks ago and it gives me around 5 watts out. Would have been more, but the power transformer I used came up a few volts short! It's shown here with the parallel 807 amp that I built on that chassis I got from you.


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W4RFM
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« Reply #2 on: January 10, 2019, 08:09:48 PM »

Is that the "Simple Transmitter RF Unit" in the west coast handbook? Page 48?  Now I see where Heath Kit got the plan for the AT-1.
Thanks Michael.
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BOB / W4RFM
w9jsw
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« Reply #3 on: January 11, 2019, 06:57:47 AM »

This design was in ER a while ago. I have the text for the article as well.


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W9ZSL
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« Reply #4 on: January 11, 2019, 11:09:11 AM »

You bet Bob. I just built an AT-1 and not only are the circuits similar but they sound the same and put out about the same amount of power. Either circuit can be modified for a VFO. The main concern about the unit from the Handbook is if the plate of the oscillator has a coil, the 6L6 must act as a multiplier.
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