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F5 power amplifier
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Old 20th May 2010, 05:55 PM   #7901
awc is offline awc  New Zealand
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I used PBJ interconnects which is 3 twisted wires, 2 - earth, 1 + , (only type of shielding used when I was a kid and still works,)

But out of preamp all 3 connected, into F5 only "+ red" to "SIN " on F5 board and 1 " -- blue" wire to GND on F5 board, "unconnected Black" then is a twisted shield that goes all the way back to pre amp and connected at that point only.
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Old 20th May 2010, 06:57 PM   #7902
Marra is offline Marra  United Kingdom
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F5 power amplifier
I found a couple of 1k5 bulk foil resistors in my parts bin would it be ok to use them instead of the 1k0 resistors[R9] on the amp input?
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Old 20th May 2010, 08:10 PM   #7903
bobodioulasso is offline bobodioulasso  Europe
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Yes.
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Old 21st May 2010, 07:18 AM   #7904
chchyong89 is offline chchyong89  Malaysia
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An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

From PSU
Green +24
Yellow -24
Black G


at last, i manage to make it almost zero hum(at least i cant hear anything even i put my ears near to the drivers) with above connections. The picture might too blur to read, but just for simple reference. Thanks andrewT, thanks all. Appreciate yours helps.
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Old 21st May 2010, 08:47 AM   #7905
bobodioulasso is offline bobodioulasso  Europe
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Start the signal ground wires from PCB (instead of PSU) and twist them with signal ones.
This will avoid that long run without shielding.
For such lengh, i would prefer shielded (coax) cable.
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Old 21st May 2010, 08:57 AM   #7906
awc is offline awc  New Zealand
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Looking good, sounds good to hey ! and will only get better.
you will never find a gainclone to soud as good as this,
match it up with some high end yesteryear gear as you can afford it, buy it off ebay, Tannoys etc and you wont want another amp.

Try and get your cables looking tight like this pick.
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.
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Old 21st May 2010, 11:21 AM   #7907
etoiledusoir is offline etoiledusoir  Canada
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Quote:
Originally Posted by chchyong89 View Post
An externally hosted image should be here but it no longer works. Please upload images instead of linking to them to prevent this.

From PSU
Green +24
Yellow -24
Black G


at last, i manage to make it almost zero hum(at least i cant hear anything even i put my ears near to the drivers) with above connections. The picture might too blur to read, but just for simple reference. Thanks andrewT, thanks all. Appreciate yours helps.
Do you use fans ? If not, is the temp. of the heasink ok ?
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Old 21st May 2010, 01:25 PM   #7908
chchyong89 is offline chchyong89  Malaysia
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there is a fan on ceiling :P it only need a very low airflow to cool down the fins.
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Old 21st May 2010, 03:29 PM   #7909
bdbender is offline bdbender  United States
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Per post 7880, that non-toroid non-shielded non-star-grounded transformer looks plenty close to be inducing hum in a pot.
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Old 23rd May 2010, 05:16 PM   #7910
etoiledusoir is offline etoiledusoir  Canada
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I want to switch my f5 with a relay, what should be the minimal output current rating of the relay ?
Does this one ELECTRONIC AND COMPUTER SURPLUS can do the job.

Thanks
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