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selenium rectifier spice model



 
 
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  #1  
Old January 18th 07, 02:26 AM posted to rec.audio.tubes
robert casey
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Posts: 340
Default selenium rectifier spice model

I found what appears to be a functioning selenium rectifier, and took
I/V curves off it, and created a spice model to simulate it. It is
marked "rca 940267 9 752652" and has 6 fins.

Spice 3f4, circuitmaker


* seleniumrectifer rca 940267 9 752652 6 fins
..SUBCKT Xseleniumrectifer P K

Bp P K I=((4.528050442/1.25e3)*uramp(V(P,K)+(-5.920633274))^
1.5)+(((0.4102562352/1.0e4)*uramp((V(P,K)-2.5)*10) ^1.5)/2)

..ends Xseleniumrectifer


"Why?" you ask. Figured someone might want to simulate a circuit that
used a selenium rectifier, and how to substitute a silicon diode and
series resistor. Building a series string of 13 1N4004 diodes in series
with a 44 ohm resistor comes close to the selenium rectifier above. But
for most applications one diode and the resistor is enough.
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  #2  
Old January 18th 07, 08:14 PM posted to rec.audio.tubes
robert casey
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Posts: 340
Default selenium rectifier spice model

flipper wrote:
> On Thu, 18 Jan 2007 01:26:16 GMT, robert casey >
> wrote:
>
>
>>I found what appears to be a functioning selenium rectifier, and took
>>I/V curves off it, and created a spice model to simulate it. It is
>>marked "rca 940267 9 752652" and has 6 fins.
>>
>>Spice 3f4, circuitmaker
>>
>>
>>* seleniumrectifer rca 940267 9 752652 6 fins
>>.SUBCKT Xseleniumrectifer P K
>>
>>Bp P K I=((4.528050442/1.25e3)*uramp(V(P,K)+(-5.920633274))^
>>1.5)+(((0.4102562352/1.0e4)*uramp((V(P,K)-2.5)*10) ^1.5)/2)
>>
>>.ends Xseleniumrectifer
>>
>>
>>"Why?" you ask. Figured someone might want to simulate a circuit that
>>used a selenium rectifier, and how to substitute a silicon diode and
>>series resistor. Building a series string of 13 1N4004 diodes in series
>>with a 44 ohm resistor comes close to the selenium rectifier above. But
>>for most applications one diode and the resistor is enough.

>
>
> Just hopped a ride on this message to say thanks again for the 6CW5
> model. The guitar amp worked like a charm and was my nephew's
> Christmas present.


Thanks. I find that simulations are a quick way to test out new ideas
and weed out the badly flawed ones. And to tweak the working ones.
  #3  
Old January 20th 07, 09:10 AM posted to rec.audio.tubes
[email protected]
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Posts: 1
Default selenium rectifier spice model



On Jan 17, 8:26 pm, robert casey > wrote:
> I found what appears to be a functioning selenium rectifier, and took
> I/V curves off it, and created a spice model to simulate it. It is
> marked "rca 940267 9 752652" and has 6 fins.
>
> Spice 3f4, circuitmaker
>
> * seleniumrectifer rca 940267 9 752652 6 fins
> .SUBCKT Xseleniumrectifer P K
>
> Bp P K I=((4.528050442/1.25e3)*uramp(V(P,K)+(-5.920633274))^
> 1.5)+(((0.4102562352/1.0e4)*uramp((V(P,K)-2.5)*10) ^1.5)/2)
>
> .ends Xseleniumrectifer
>
> "Why?" you ask. Figured someone might want to simulate a circuit that
> used a selenium rectifier, and how to substitute a silicon diode and
> series resistor. Building a series string of 13 1N4004 diodes in series
> with a 44 ohm resistor comes close to the selenium rectifier above. But
> for most applications one diode and the resistor is enough.



I replaced a selenium rectifier (grid bias for 6V6GC) in an old
McIntosh 40-watt per ch amp back in the early 70's, using a string of
diodes like you said (5 1N4001's IIRC). It still works, but I've always
wondered if I did it right. Maybe I'll try modeling and building one
with transistors. Thanks for the info.

Frank

 




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