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Old 8th December 2012, 07:57 PM   #31
tinitus is offline tinitus  Europe
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Originally Posted by merlin el mago View Post
Please read carefully all thread, I learned a lot with the kind people helping me to understand & calculate.
yes, I noticed some changes

but maybe other members would build it, and still use the big lytic cap
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Old 8th December 2012, 08:02 PM   #32
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If so don't learned nothing, diy is the way to learn & improve the devices.
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Old 9th December 2012, 10:53 AM   #33
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To improve the design I will use SSHV2 shunt regulator + CCS, also can improve changing the cathode caps & resistors with LEDs, if yes wich value 1.9-2.1V 20mA can be enough? there is other ways to improves the MJ design?
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Old 9th December 2012, 11:37 AM   #34
Stixx is offline Stixx  Germany
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Quote:
also can improve changing the cathode caps & resistors with LEDs, if yes wich value 1.9-2.1V 20mA can be enough? there is other ways to improves the MJ design?
When you study the schematic carefully you will see that the first stage draws about 4mA and the second about 9mA... a string of two orange LED's did the trick when I built the MJ a couple years back. The entire conversion was guided by Morgan Jones himself back then (), and it worked perfectly. You need to bias the first stage to about 3 - 3.5V that's why I used two orange LED's. They can be rather generic since you are only dealing with 4mA current draw.
I was playing with the idea of the MJ with different tubes also (to have more current draw through the second stage) and came up with a schematic using russian 6N23P and 6N6P... but I actually never built it like that.
Using the SSHV2 is always a good idea since it is good to power pretty much anything
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Old 9th December 2012, 11:39 AM   #35
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Thanks Stixx, what about the question to use output transformer in the mu-follower with an output impedance of 120 ohms?

Last edited by merlin el mago; 9th December 2012 at 11:45 AM.
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Old 9th December 2012, 02:23 PM   #36
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Quote:
Originally Posted by merlin el mago
To improve the design I will use SSHV2 shunt regulator + CCS, also can improve changing the cathode caps & resistors with LEDs, if yes wich value 1.9-2.1V 20mA can be enough? there is other ways to improves the MJ design?
May be better to build it as it is, then upgrade it later. A common mistake made by inexperienced folk is to want their first ever build to be so perfect that they will never need to change it. The result can be frustration for them and us, as it doesn't work but they can't tell us exactly what they have done - all we know is that it is different from the published circuit.
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Old 9th December 2012, 02:25 PM   #37
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Originally Posted by merlin el mago View Post
If so don't learned nothing, diy is the way to learn & improve the devices.
perhaps, but how others choose to build it will their problem
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Old 9th December 2012, 03:07 PM   #38
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no comment
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Old 9th December 2012, 03:22 PM   #39
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no need for that attitude

looks like a fine design, and nicely improved
but not everyone knows how to handle/wire a ccs
they might want to build it without, and so on
and they may not want a huge and expencive poly cap
which it still is

why wouldn't a simpler and cheaper version be ok
could be its still a fine headamp, despite the better options
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Old 9th December 2012, 03:26 PM   #40
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I like the tone of your last post, thanks.
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