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Old 25th June 2005, 04:40 PM   #2821
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Terry, Q108/9 run pretty cool. Q109/10/11 all need isolating from each other.
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Old 25th June 2005, 05:23 PM   #2822
Coulomb is offline Coulomb  England
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Quote:
Originally posted by Mark A. Gulbrandsen


There are also available stainless steel star type washers as well as regular type stainless lock washers.



Yes, they have to be insulated with what ever you prefer to use...... These devices have full rail potential on the collectors(metal tab). I use ceramic-alumnium oxide insulators on all my devices cause I can get em cheap at surplus.

Mark
Hummmm Mark do you use plastic srews?

Regards

Anthony
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Old 25th June 2005, 05:53 PM   #2823
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Quote:
Hummmm Mark do you use plastic srews?
I have used them on a few occasions in a pinch! Later on to be replaced by the real thing.

Mark
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Old 25th June 2005, 06:33 PM   #2824
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Quote:
Originally posted by still4given
Don't Q107 & 108 need heatsinking?
Terry,

if you look at the datasheet for the 15032/33 you can see 2 power figures: 50 watts and 2 watts, for Tc and Ta.
In the Safe Operating Area graph there are 2 lines as well, one for Tc, the other for Ta.
Ta is for ambient, without heatsink.
Tc for cooled, with infinite large heatsink.

Means the MJE's can dissipate 2 watts at 25C without cooling, even at 55C they do 1.5 watts without heatsink.
Even under the worst load dissipation of Q107 and Q108 is a fraction of what they can handle without heatsink.
Which is good, because they will only heat up a little, in return that will keep their parameters fairly constant.
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Old 26th June 2005, 12:18 AM   #2825
neychi is offline neychi  Croatia
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Well, that's it for today. I'm going to sleep now.
Cheers
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Old 26th June 2005, 12:31 AM   #2826
VT67 is offline VT67  Belgium
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Hi neychi

Your boards start to look very nice. What type are those bulky resistors on the output boards?
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Old 26th June 2005, 04:49 AM   #2827
lgreen is offline lgreen  United States
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Default input clipping spec

How many volts on the input will it take to clip this clone?

Of course I'm wondering whether the iPod will drive it to full output.


oooohhh....my faceplate gets here tues, can't wait to see if it fits!
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Old 26th June 2005, 05:32 AM   #2828
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Beautiful boards Neychi
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Old 26th June 2005, 07:27 AM   #2829
neychi is offline neychi  Croatia
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Hi,
Walter, thay are metal-oxyde, 1k, 5%, 4.5W from Buerklin. Two in parallel for 0.5ohms, 9W. I'm planing to do another pair with Stuart's resistors 0R68 and TO3 transistors.
Tony, thanks
Best regards
Dean
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Old 26th June 2005, 07:37 AM   #2830
neychi is offline neychi  Croatia
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I'm steel sleeping. 1R, 4.5W, 5% of course.
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