is 6X5 a 6X4 in an octal form? - Page 3 - diyAudio
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Old 22nd June 2003, 11:59 PM   #21
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Hi,

Quote:
Well you first mentioned the value 1ohm 10W resistor. Why can't I use 2ohm 5W in parallel?
It was just an imaginary value, if you need, say 10W of dissipation capability and can only get 5W resisistors you can put twice the target Ohmic value in //.

For example, in a give diagram it says 100R 10W but the shop carries nothing heavier than 5W resistors, you can now buy 2 200Ohm/5W resistors and put them in //.

Once paralelled the ressitor you now created will be a 100R/10W.

This is true for all values and wattages as long as you use equal values and wattages.

Hi Tim,

Quote:
YES. In fact they often use the exact same electrode structures.
Could be but shouldn't be.

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Old 23rd June 2003, 12:48 AM   #22
jarthel is offline jarthel  Australia
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Quote:
Originally posted by fdegrove



Well, there's that cap directly after the 6X5 of course, either remove it altogether or move it after the choke where you can make another RC filter cell.
so it becomes (the italized change):

6X5GT -->> choke -->> capacitor -->> resistor -->> capacitor -->> resistor -->> capacitor

right?
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Old 23rd June 2003, 12:51 AM   #23
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Hi,

If not for my comment this will be the shortest post I've ever made...

Yes.

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Old 23rd June 2003, 01:42 AM   #24
jarthel is offline jarthel  Australia
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using the original circuit but with a 6X5GT, duncan's tool prompts a message saying "rectifier IFRM os .24A has been exceeded with a value of .25A at time xxxx seconds."

Is that a bad thing?

With your suggestion Frank, this message is not displayed which I guess is a good thing.

Changing the capacitors C1 and C2 in the original circuit to 8uF and 10uF respectively removes the prompt. Though this means I have to buy 2 more capacitors.
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Old 23rd June 2003, 01:54 AM   #25
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Hi,

Quote:
I guess that a bad thing.
Not necesarilly...I don't trust those proggies anyway.
You may need to increase the response delay or something, someone may be explain what happens, I work the old fashioned way.
Mista calculata, you know...

Quote:
With your suggestion Frank, this message is not displayed which I guess is a good thing.
It better... Which is why I don't trust those in the first place...

Just kidding.

Quote:
Though this means I have to buy 2 more capacitors.
No, you don't...unless you absolutely want to.

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Old 23rd June 2003, 01:57 AM   #26
jarthel is offline jarthel  Australia
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Quote:
Originally posted by fdegrove

Mista calculata, you know...
care to explain how to use calculator/pen and paper in computer current/voltage for the circuit?

Jayel
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Old 23rd June 2003, 02:09 AM   #27
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Hi,

Quote:
care to explain how to use calculator/pen and paper in computer current/voltage for the circuit?
Oh dear, actually no calculator insight..I just know what I'm on about.

I don't want to sound presumptious but this is NOT something you acquire overnight.

After twenty years it just becomes second nature, you look at a circuit and spot the mistakes..where corners have been cut and so on.

I'm sure some other members feel the same way, it doesn't mean anything really just alot of field experience.

As said before, Ohms' law is a darn good place to start.

All the best,
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Old 23rd June 2003, 02:15 AM   #28
jarthel is offline jarthel  Australia
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I studied computer engineering. But that was like 9 yrs ago and I haven't applied that electronic/electrical knowledge. I've been working on the software side.
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Old 23rd June 2003, 02:16 AM   #29
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Hi

According to the data sheet for 6X4 and also for other similar rectifiers it is advised to use a min value of resistance of several 100s ohms in order to limit the peak current when using a cap input filter, the resistance in this case is the transformer winding resistance + eventual serial resistors before the first cap, values for 6X4 is mentioned as 500 ohms typical. If a series resistance like this is used and if the value is high enough the input cap value is not so important as the resistance will limit peak current to a safe value.

See rating chart 3 in this pdf file http://www.mif.pg.gda.pl/homepages/f.../093/6/6X4.pdf

BTW, according to the RCA tube databook they refer to 6X4 for typical data for the 6x5...

Regards Hans
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Old 23rd June 2003, 02:49 AM   #30
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Hi,

Quote:
BTW, according to the RCA tube databook they refer to 6X4 for typical data for the 6x5...
In historical order we had octals, than novals, than pico 7s as we call them amongst other formats.

So, logically the 6X4 was born out of the 6X5, right?

Which is probably what you meant anyway?

To me, the 6X4 is the 6X5s' little nephew, isn't it?

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