[robert casey]

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.

[robert casey]

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.

[[email protected]]

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