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Old 4th May 2013, 12:29 PM   #1
diyAudio Member
Join Date: Jan 2005
Location: Denmark
Lightbulb EF184 driver

Hello friends

One evening I was surfing the net, I ended up on a Hungarian website.

I found an interesting diagram where the input amplifier and phase circuit is designed around 2 pcs EF184. A tube that is in abundance in Europe.

I will not take credit for the work, but I thought that it must be shown.

I find a link to the author, and writes into the thread.

With a wish for a good weekend to all.

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File Type: pdf xL36 PP EF184.pdf (12.0 KB, 161 views)
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Old 5th May 2013, 06:17 PM   #2
diyAudio Member
Join Date: Aug 2010
Location: Near Eindhoven, the sanctum of the pentode. and among that other things.
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Yes they are superb tubes. the build quality is good to. they use frame grids to get the higher amplification and the resulting higher BW

The only drawback of these is the un-lineairity, and a tendency to oscillate if A careless layout is used.

However the slight un-linearity is not a problem when using them as error amplifiers in stabilized power supplies or using them in cathode follower applications.

I'm under the impression that there must be a certain G2 voltage where this tube will operate much more linear. or perhaps triode mode is a good

Ah found it- http://www.kaponk.com/~yanyong/ETF06TS.pdf Page 26 damm lineair .

When operating this tube, be sure to add 100 ohms stoppers in the anode and g2 leads. And 1k non-inductive for the grid lead.

kind regards V4lve
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