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Glassware ACF-2 Aikido hum problem
Glassware ACF-2 Aikido hum problem
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Old 31st January 2019, 07:23 AM   #81
sunil is offline sunil  India
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Can somebody please help answer this. The extra cap pair to sort the buzz problem, would 220uF do ?
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Old 12th February 2019, 03:40 PM   #82
sunil is offline sunil  India
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I've installed the pair of 220uF caps at C4. Have a new problem though - R7 gets really hot. One of them started to turn brown. Thinking it could be a faulty part I replaced with a new R, same problem.

I've also posted this in a thread for my ACF-2 build. Sorry about the repeat.
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File Type: jpg Aikido ACF-2 -split C4 (S).jpg (907.9 KB, 121 views)
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Old 13th February 2019, 04:48 PM   #83
alexcp is offline alexcp  United States
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Glassware ACF-2 Aikido hum problem
Quote:
Originally Posted by alexcp View Post
Yes, that is the way to connect the two caps.
Thanks to Sunil, I just realized that the connection shown in post #74 above is wrong - sorry I did not notice it the first time. The cap connected between the ground and R7 - that's the left cap on the photo in post #74 and the one close to the board's edge in sunil's post above, should be reversed, as R7 is the negative rail. Connected as shown, the cap may short the negative rail, burn R7, and possibly explode.

Last edited by alexcp; 13th February 2019 at 04:50 PM.
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Old 19th February 2019, 12:59 PM   #84
sunil is offline sunil  India
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Thanks alexcp. Waiting for the caps.
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Old 20th February 2019, 03:16 PM   #85
sunil is offline sunil  India
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It works. Got a new set of caps and wired them the right way around.

It is quiet. I'm running very efficient Altecs and there is absolutely no HUM, compared to earlier, without the twin-cap mod.

Thanks alexcp.
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Old 20th February 2019, 03:38 PM   #86
cl00sed is offline cl00sed  Abu Dhabi
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Default Glassware ACF-2 Aikido hum problem

Quote:
Originally Posted by sunil View Post
It works. Got a new set of caps and wired them the right way around.

It is quiet. I'm running very efficient Altecs and there is absolutely no HUM, compared to earlier, without the twin-cap mod.

Thanks alexcp.


Hi Sunil could please post the closer pics and the capacitors values used.
Me too want to try with my Akido octal buffer.

Regards
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Old 20th February 2019, 04:11 PM   #87
sunil is offline sunil  India
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The twin cap is 220uf@200v each. Any particular values you after ?
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Old 20th February 2019, 04:27 PM   #88
cl00sed is offline cl00sed  Abu Dhabi
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Quote:
Originally Posted by sunil View Post
The twin cap is 220uf@200v each. Any particular values you after ?

Just want to confirm about orientation of the caps
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Old 21st February 2019, 01:32 PM   #89
sunil is offline sunil  India
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Default C4 dual cap orientation

Here you go. Hope that helps.

I've separated the signal ground, using Cat5. Works just fine (dual twisted pair /channel).
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File Type: jpg ACF-2_Components_C4.jpg (376.5 KB, 35 views)
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Old 21st February 2019, 02:15 PM   #90
cl00sed is offline cl00sed  Abu Dhabi
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Quote:
Originally Posted by sunil View Post
Here you go. Hope that helps.

I've separated the signal ground, using Cat5. Works just fine (dual twisted pair /channel).


Thanks Sunil
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