Hoffman Amplifiers Tube Amplifier Forum

Other Stuff => Solid State => Topic started by: plexi50 on February 25, 2011, 03:34:39 pm

Title: SS PCB Cracked Trace Detection?
Post by: plexi50 on February 25, 2011, 03:34:39 pm

I have a Marshall G80 that has a PCB board as thin as they come

I have a crack on a trace and i cant find it doing the DVM meter testing

If i recall back in the 70's they used a clear spray that was flourescent and showed any cracked or bad PCB traces under a blacklight

Thats what i remember. Does this still hold true or is there another visual method?

Title: Re: SS PCB Cracked Trace Detection?
Post by: thermion on February 25, 2011, 05:32:53 pm

Sounds reasonable:

http://www.patentgenius.com/patent/4621193.html

Be careful - fluorescent dyes can be toxic. Planar hydrophobic moieties (that make fluorescent dyes do what they do) can also readily bind DNA.

Title: Re: SS PCB Cracked Trace Detection?
Post by: plexi50 on February 25, 2011, 05:39:43 pm

Well i dont want to be linked to DNA and the amp. This amp isnt worth 0.45 / I touched up a few resistors that in  pic's
looked unsoldered from the board holes. It's not breaking up so far so i hope this is finished.

I wont work on one again. The entire board is so flimsy you have to support it in 3 places

I will check out that link. Thanks  

Title: Re: SS PCB Cracked Trace Detection?
Post by: thermion on February 28, 2011, 01:02:33 pm

Sorry I should have clarified: compounds that bind DNA often are classified as carcinogens because of this binding. If you use a fluorescent spray be extra sure of your ventilation and personal protective equipment.
Happy hunting.