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Old 13th January 2013, 08:04 PM   #12801
dazed2 is offline dazed2  Canada
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+1
Also I referenced ground from the ground of the RCA input and had that connected to PSU ground.

inside 1.jpg

Please excuse the caps and the mess. This is an old pic, it doesn't look like this now
If you can see I combined the ground at RCA and went directly to PSU ground. I also took speaker ground from PSU ground as well. The ground from the amp board should "flow" towards the RCA ground to PSU.
I had hum as well when I connected otherwise. This way I don't get hum even when attached to 104db speakers and 25db gain pre.
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Old 13th January 2013, 09:36 PM   #12802
6L6 is offline 6L6  United States
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Quote:
Originally Posted by biju55 View Post
Remove the -ve wire ( black ) to speaker from amplifier board , and connect it to power supply board ground .
That was much louder. In fact the mechanical hummm of the transformer was increased in that configuration.
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Old 13th January 2013, 09:37 PM   #12803
6L6 is offline 6L6  United States
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Quote:
Originally Posted by Zen Mod View Post
grounded inputs - same reading ?
Yes

Quote:
what's happening when you feed just one channel with present PSU ?
I will try it and find out.
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Old 13th January 2013, 11:40 PM   #12804
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Hi There!
I think I got some problems, I can't solve. At first I got the Cviller F5c V2.0 and got a lot of smoke. I did one channel only, but could not get it to working order. So I had also some Peter Daniels boards, and decided to build them also, and fired them up. I had on the output at first -47 mv and could change that to 0.00 mv with the pots. I also checked R11 and R12 but they did not doing anything, they stayed at 0.00mv. The mosfets didn,t getting warm. So I shut down the amplifier and saw the output running down from 0.00 to first -47mv than going up147mv and than going back to zero. I could not measure any DC on the psu when in the on position. Checking the psu without the ampboards, they measured 23.5vdc. Maybe there are some people on the forum who can help me. Grtz Teake
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Old 13th January 2013, 11:44 PM   #12805
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emh. did you forget to adjust bias?
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Old 13th January 2013, 11:45 PM   #12806
Zen Mod is offline Zen Mod  Serbia
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my crystal ball goes from muddy state ....... to sent for repair

so - pics , pics ....... and then some pics

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Old 13th January 2013, 11:49 PM   #12807
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that was about time ZM. it's been muddy for a while now
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Old 13th January 2013, 11:52 PM   #12808
Zen Mod is offline Zen Mod  Serbia
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bummer ;

I sent it to Jacco , he insisted , as it will be (supposedly ) repaired for free

but somehow , I feel doubt developing ...... that it will stay in Lalaland , for good



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Old 13th January 2013, 11:54 PM   #12809
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Old 14th January 2013, 09:48 AM   #12810
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Default problem with crydom solid state relay

Greetings,

Has anybody had any success powering up an F5 through a crydom ssr.
When I connect the relay to the 1 tfo for stereo output, no problem, when I connect relay to a dual mono configuration, the tfo's produce noise.I mean physical hum on the tfos themselves. The dual mono is just the same as stereo except I split the channels with their own ps. When I power through the on-off switch directly connected to the fuse, I get no noise. I read that the crydoms don't like high inductive loads. Since this is touching mains 120V, I'd like to have expert advise.

Does any one know how to resolve this?


kind regards.

Last edited by necplusultra; 14th January 2013 at 10:05 AM.
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