JFET/MOSFET Pentode Emulation

Frequent asked about building blocks: gain stages, buffers, clipping configurations, ...
Post Reply
User avatar
POTL
Resistor Ronker
Information
Posts: 335
Joined: 26 Sep 2016, 03:11
Has thanked: 58 times
Been thanked: 67 times

Post by POTL »

Hello
Everyone knows that with the help of a field-effect transistor it is possible to simulate the operation of a triode, it is now actively used to create amplifiers in a box
But such circuits mimic only the work of the preamp
The terminal amplifier uses pentodes, there are not enough leads for simulating the transistor, are there ways of combining the transistor as mu-amp or something similar to simulate a pentode?

User avatar
ppluis0
Diode Debunker
Information
Posts: 915
Joined: 14 Jul 2010, 18:33
Location: Argentina
Has thanked: 127 times
Been thanked: 299 times

Post by ppluis0 »

Hi POTL,

If you have enough time, there is a 40 pages document: http://www.davmar.org/misc/Fetron.pdf

Try search the web (especially images) using "Fetron tube" as keyword.

There is a couple of radio amateur articles: http://collinsra.org/home/album/solid-state-6au6/ and: http://collinsra.org/home/album/solid-state-6bf5/ 8)

Also take a look at this thread: viewtopic.php?f=20&t=23005&hilit=12ax7eh#p227194

Cheers,
Jose

User avatar
POTL
Resistor Ronker
Information
Posts: 335
Joined: 26 Sep 2016, 03:11
Has thanked: 58 times
Been thanked: 67 times

Post by POTL »

Thanks Bro! :thumbsup

User avatar
anselm
Information
Posts: 6
Joined: 02 Jun 2014, 14:42
Has thanked: 13 times
Been thanked: 6 times

Post by anselm »

mmm
infact, jfet behaves just like pentode by itself
there are couple coversation on the net, about how to make "triode" of jfets


xquze my eng
have fun :wink:

Post Reply