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An illustrated guide to building an F5
An illustrated guide to building an F5
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Old 17th September 2020, 01:43 AM   #1481
ItsAllInMyHead is offline ItsAllInMyHead  United States
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An illustrated guide to building an F5
Could someone with better eyes check the values of R21 and R5? It may be worth checking their counterparts also, but I can't see them in the picture at all.

Edit - I got the picture to enlarge on my screen. They look correct at 2.21k.
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Last edited by ItsAllInMyHead; 17th September 2020 at 01:46 AM.
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Old 17th September 2020, 01:58 AM   #1482
KevinHeem is offline KevinHeem  United States
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An illustrated guide to building an F5
@Chiptech

Check Bottom of R12. It doesn't look like it's been soldered.
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Old 17th September 2020, 10:13 PM   #1483
Chiptech is offline Chiptech
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Default I checked all the solder points

All are soldered

see photo
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File Type: jpg Right Channel board.jpg (769.4 KB, 108 views)
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Old 17th September 2020, 10:15 PM   #1484
Chiptech is offline Chiptech
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Default Dim Bulb Failure

Well, still have dim bulb failure. I set up to measure as instructed, but still no joy. I looked at all the solder points on the board and they look good to me.

Appreciate any ideas of what to look at.
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Old 17th September 2020, 11:25 PM   #1485
Ben Mah is offline Ben Mah  Canada
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An illustrated guide to building an F5
Did you read the voltage across R7 while you had the power on?

With the power off, set your meter to Ohms and one probe on the Mosfet washer/screw, measure resistance with the other probe on each of the Mosfet pins and the Mosfet thermistor pins. All should read infinite resistance. This is to check to make sure the isolator between the Mosfets and the heat sink and the coating on the thermistors are not damaged and therefore conducting electricity to the mounting screw and heat sink and ground.
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Old 17th September 2020, 11:36 PM   #1486
6L6 is offline 6L6  United States
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An illustrated guide to building an F5
Quote:
Originally Posted by Chiptech View Post
Well, still have dim bulb failure.
You powered up with the amp channel attached and the light turned on and stayed on bright?
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Old 18th September 2020, 12:57 AM   #1487
Chiptech is offline Chiptech
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Yes. And I got OL readings.
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Old 18th September 2020, 02:20 AM   #1488
6L6 is offline 6L6  United States
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An illustrated guide to building an F5
Take the fender washers off and double-triple check you have the IRF240 at Q4 and the IRF9240 at Q3
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Old 18th September 2020, 05:51 AM   #1489
Chiptech is offline Chiptech
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I have Right Q3 is wrong and Left Q4 is wrong. They need to be swapped.

thanks for helping me find this.
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Old 18th September 2020, 11:07 AM   #1490
McQuaide is offline McQuaide  United States
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