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Title: trioderizer
Post by: rodriki1 on October 06, 2009, 03:53:51 PM

take a look

http://www.radiomuseum.org/forum/the_trioderizer_a_solid_state_triode.html

I am not looking for trouble...
just a funny curious thing.
my regards

Title: Re: trioderizer
Post by: Cliff Schecht on October 06, 2009, 04:03:33 PM

Very cool!!

I need to find myself a curve tracer :D.

Title: Re: trioderizer
Post by: Ripthorn on October 06, 2009, 05:05:14 PM

The trioderizer sounds like a hygiene product gone horribly wrong... :icon_biggrin:

Title: Re: trioderizer
Post by: Brymus on October 06, 2009, 09:26:18 PM

If you read to the end he recomends a mosfet from Mouser LND150 as a drop in replacement (sort of) for a 12AX7
stating its 500V rating,using his triodorizer.
I would like to here what the guys who know this stuff think about his approach.
It looks pretty similiar to what the people here have done with jfets with the trimmer on the source.

Title: Re: trioderizer
Post by: R.G. on October 06, 2009, 10:34:48 PM

I can't get the page to open, but is it like the used in Mosfet Follies?

I use smaller MOSFETs than the IRF820 these days, as Zetex and Supertex have 500V devices in a TO92.

How they ...sound... is a different matter.

Title: Re: trioderizer
Post by: Rob Strand on October 07, 2009, 03:31:08 AM

Aron's Dumble overdrive actually uses this already. (The Dumble actually triodizes triodes - it's just negative feedback!)

Title: Re: trioderizer
Post by: rodriki1 on October 07, 2009, 09:05:04 AM

some more discussion

http://www.diyaudio.com/forums/showthread.php?postid=1828520

Title: Re: trioderizer
Post by: R.G. on October 07, 2009, 09:30:24 AM

Nope, different approach. Cool!

Title: Re: triodized FET
Post by: puretube on October 09, 2009, 01:38:03 PM

[How to] (http://www.pat2pdf.org/patents/pat3828230.pdf) roll your own "Tube-like" FET...

Title: Re: trioderizer
Post by: Brymus on October 09, 2009, 02:58:38 PM

I am guessing that no manufacturer ever produced these new type of FETs.
Still quite interesting...

Title: Re: trioderizer
Post by: amptramp on October 10, 2009, 10:10:45 PM

The problem with a FET is that the interelectrode capacitances are much higher than tube capacitances and more importantly, they vary with voltage. This works in a near-DC situation like a curve tracer but you would need large varactor diodes with varying voltages across them to counteract the effects at higher (but still audio) frequencies. If you are operating at much more than small signal levels, the power needed to drive these external varactor capacitances would be large.

Title: Re: trioderizer
Post by: GibsonGM on October 11, 2009, 06:31:56 PM

I wonder how this works with respect to grid current limiting? In a guitar situation, the impedance change in a tube occurs gradually, while in a FET or BJT, it is a sudden onset, thereby offering only 1 "type" of grid current overdrive. So I guess the triode will live to fight another day! Neat concept, though, a really useful study!

Title: Re: trioderizer
Post by: puretube on November 13, 2009, 06:55:15 PM

Anybody cross-reading? (http://www.diystompboxes.com/smfforum/index.php?topic=80221.0)

Title: Re: trioderizer
Post by: Cliff Schecht on November 13, 2009, 07:27:35 PM

Quote from: puretube on November 13, 2009, 06:55:15 PM
Anybody cross-reading? (http://www.diystompboxes.com/smfforum/index.php?topic=80221.0)

No.

DIYstompboxes.com

DIY Stompboxes => Building your own stompbox => Topic started by: rodriki1 on October 06, 2009, 03:53:51 PM