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Old 31st August 2007, 07:32 PM   #1101
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Thank you Marco, good link.
I'm planning two mono units, I'll try to build 2 cases using the heatsinks, some wood and alu panels, wondering how...
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Old 31st August 2007, 07:37 PM   #1102
Jaac is offline Jaac  Netherlands
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Default Re: Re: There is an update to the 6Moons Review...

Quote:
Originally posted by Nelson Pass


I expect yet another soon.

Oké any hints ?? the INT 150 ?
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Old 31st August 2007, 08:18 PM   #1103
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I meant an additional installment of the F4 review.

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Old 1st September 2007, 05:39 PM   #1104
lykkedk is offline lykkedk  Denmark
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Hi all...

I would like to know, if it's worth swapping mosfet's (irfp240) in / out because of this :

I am in progress of making my second (first is allright ) F4 monoblock, and while testing the left channel (bias/dc-offset adjust) i realised that i had a difference between the irfp240 at this range 248mV / 228mV (around 8-9%), is it worth doing something about or not ?

The rest of the irfp240 / irfp9240 is in the range 245mV - 250mV. This i consider good!

I know i could do some listning test, but please just tell me, if it's acceptable or not !

Please respond quick

Jesper.
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Old 1st September 2007, 09:30 PM   #1105
lykkedk is offline lykkedk  Denmark
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I did correct, the error with another irfp240, sry. for my desperate thread...

i will pay ya' back with a pic. of my kids... (background is 2. F4 setup)

Jesper...
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Old 1st September 2007, 10:57 PM   #1106
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Beautiful children!

The amp doesn't look half bad, either
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Old 2nd September 2007, 01:36 AM   #1107
Zen Mod is offline Zen Mod  Serbia
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Quote:
Originally posted by carpenter
Beautiful children!

The amp doesn't look half bad, either

I second that



amp.... what amp?

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Old 3rd September 2007, 12:54 PM   #1108
lykkedk is offline lykkedk  Denmark
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Quote:
By ZenMod : amp.... what amp?
No amp... 2 amp's ! have a look

Well it wasen't supposed to be shown yet, as they are not finish. But the other day i paniched, and accedently showed a pic... So what the hel..
Here is how far i got till now : Both amp's fully tested, and played some hour's. The temperature settles around 40-45C after 1,5hour and becomes 'termic-stable' here Bias is 250mV (pending between 243-252mV around the six mosfets on each channel. I still need a faceplate, (wood perhap's)but havent made my mind up about it!

I got 1 quistion today. I have a thermistor CL60 in serie with primary, which must eat around 0,9A / 230V and it grows really hot (around 60C) is this normal ???

I have uploaded a few more pic's on this website here
ENJOY.

Jesper.
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Old 3rd September 2007, 04:53 PM   #1109
protos is offline protos  Greece
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Thermistor starts cold with a high ohmic value to limit surge then heats up and drops impedance considerably at the correct current draw.
Not recommended of course for non-class a amps.
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Old 3rd September 2007, 05:32 PM   #1110
lykkedk is offline lykkedk  Denmark
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Quote:
I use CL60's at 2 to 2.5 amps, and not above, as they
get quite hot. I have seen failures at 4 amps or so, so
above 2 amps I run 1 each on the dual primary windings.
This was from a very old thread, posted by master Pass himself... I guess it's allright that they grow hot!

Jesper.
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