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knight 60 circuit board ?

67.162.196.44
Posted on July 16, 2014 at 20:35:31
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
 I heard there was a guy making replacement boards for these but I haven't been able to find them. Anyone have a source on these?

If I can't find them I'll use this one. I'm going to replace all the caps and resistors but first get them cleaned up. I've de-soldered most of the board but was wondering what to use to clean them up as they are gnarly with some sort of brown residue.

thanks





High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

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RE: knight 60 circuit board ? , posted on July 16, 2014 at 20:55:48
unclestu
Dealer

Posts: 5851
Joined: April 13, 2010
 Resin from solder, wash with isopropyl alcohol. allow to soak a while then scrub with brass wire brush gently

 

RE: knight 60 circuit board ? , posted on July 16, 2014 at 21:24:00
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
 Will do. Thanks!
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

Careful with the brush..., posted on July 17, 2014 at 11:35:49
Steve O
Audiophile

Posts: 12359
Location: SE MI
Joined: September 6, 2001
 ...I've been thru a few of these amps and the traces are extremely fragile and prone to lifting for no apparent reason. I've used Q-tips with acetone to clean the crappy fluxes used back then. Tedious but easy on the traces. Acetone goes after the petrified flux better than alcohol and doesn't attack the phenolic substrate. Use with good ventilation.

 

RE: Careful with the brush..., posted on July 17, 2014 at 12:15:28
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
 Yeah I'd rather have new boards but this is what I have to work with... What can be done if a trace does rise of the board? Can it be saved or is it trash?

I'm going to clean one of the boards tonight. I left the other connected so I could use it as reference for when it goes back together lol.....

thanks
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

RE: Careful with the brush..., posted on July 17, 2014 at 20:10:46
Steve O
Audiophile

Posts: 12359
Location: SE MI
Joined: September 6, 2001
 Repairing lifted traces can be a bit of an art. I've used #22 tinned wire shaped as nec. to replace or reinforce bad traces. Since the wire needs to be solidly soldered to what good trace remains, everything needs to be clean and oxide/resist free before soldering. I also use a liquid flux and 63/37 solder to keep temp as low as possible.

 

RE: Careful with the brush..., posted on July 17, 2014 at 20:35:44
Iain42
Reviewer

Posts: 895
Location: Arcansaw
Joined: February 10, 2004
 Thanks for the advice. The first board cleaned up ok. I took it slow and also removed a few caps. Two of them were bad. I guess I'll take it easy and determine if the board was saved when finished.

Thanks again
High sensitivity, wide dynamic range, low distortion, and smooth frequency response. Pwk

http://www.itishifi.com

 

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