4E27 Triode connection SPICE model - diyAudio
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Old 5th June 2009, 03:57 PM   #1
ja2dhc is offline ja2dhc  Japan
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Default 4E27 Triode connection SPICE model

I have made a spice model of 4E27 triode connection. The file of
the models for SPICE, SIMetrix and TINA has been uploaded into
my Web as below.

http://ja1cty.servehttp.com/4E27/spice.zip

The file is a ZIPed file including three files for spice, SIMetrix and TINA.
The attached photo is a Ip curve of 4E27 triode connection. It shows
very good linearity and low impedance like 845.
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File Type: png 4e27-rcurve.png (87.8 KB, 306 views)
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Old 5th June 2009, 07:00 PM   #2
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Have you built anything with the triode-wired 4E27?
If so, how did it sound?

Jim
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Old 6th June 2009, 01:06 AM   #3
ja2dhc is offline ja2dhc  Japan
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Quote:
Originally posted by dowdylama
Have you built anything with the triode-wired 4E27?
If so, how did it sound?
Jim
I've not yet built an amp using 4E27 triode wired. But I did a simulation
using the spice model which I uploaded into my Web.

The simulation schematic is shown in the attached photo. As you can
see, it is SET NO-NFB construction. Operating conditions are as follows:

Ep=700V
Ip=100mA
Vg=-110V
Rl=5Kohm

As a result. THD=2%@20W is obtained. It is remarkably low distortion
within NO-NFB SET amps.
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File Type: gif 4e27-sim.gif (42.0 KB, 274 views)
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Old 6th June 2009, 01:30 AM   #4
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I have a few of these and hope to build soon. I was thinking more of the two stage 845 amp using a 6HV5 / 6JD5 at 900 to 1000 volts. There is so much gain to kill in the front end I thought a bit of local feedback would reduce the output impedance of that stage to better drive the 4E27A. 0.7v sensitivity without feedback and lots of swing. There is a thread about this.
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