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Old 22nd June 2011, 08:50 AM   #1
markusA is offline markusA  Sweden
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Default Help me find cirquit, I forgot where I last saw it?

I'm looking for a DC coupled cathode follower (I think it was a cathode follower?) with a servo on the cathode side fixing the output at dc ground.

I think I've seen it posted somewhere as cirquit of the week or something like it?

It's possible that it wasn't a cathode follower, my memory sometimes plays tricks on me. (I had a computer crash and all my bookmarks got lost.)
Any help is appreciated.
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Old 22nd June 2011, 02:40 PM   #2
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Maybe something like this? The right side LTP (V3,V4) acts to boost the gm of the right side (V2)power triode. This was in the old anti-triode SET emulation threads. There was an RIAA phono stage circuit around too that used a gm booster, I think with just one add-on tube.
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Old 22nd June 2011, 03:41 PM   #3
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Well DC coupling both the input AND output of a CF would be quite the trick now

Your idea that was a "circuit of the week" suggests the Tubecad site. I would just google "site:www.tubecad.com servo" and see what you find.
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Old 22nd June 2011, 05:10 PM   #4
markusA is offline markusA  Sweden
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Thanks for reminding me. I found a circuit of the month that's quite interesting.
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Old 22nd June 2011, 05:19 PM   #5
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Quote:
Originally Posted by leadbelly View Post
Well DC coupling both the input AND output of a CF would be quite the trick now
It is easy, with 6N7 for example.
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Old 22nd June 2011, 05:20 PM   #6
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"I found a circuit of the month that's quite interesting."

Link?
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Old 22nd June 2011, 05:22 PM   #7
markusA is offline markusA  Sweden
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Circuit of the Month: October 1998
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Old 22nd June 2011, 05:48 PM   #8
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Quote:
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It is easy, with 6N7 for example.
I assume you mean it's easy using multiple sections, but only one of those sections is the actual CF.
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Old 22nd June 2011, 05:52 PM   #9
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Quote:
Originally Posted by leadbelly View Post
I assume you mean it's easy using multiple sections, but only one of those sections is the actual CF.
No, I assume similarly to what was shown in Broskie's article, but no need for additional voltage drop resistor in cathode. Just a CCS in cathode with servo.

Even without CCS and servo (that is gyrator actually), load 6N7 on a choke with low DCR, that's it.
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Old 22nd June 2011, 06:00 PM   #10
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Quote:
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No, I assume similarly to what was shown in Broskie's article, but no need for additional voltage drop resistor in cathode. Just a CCS in cathode with servo.
If there's no resistor then what's setting the bias?
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