I would like to know what influence on the sound, if any, have dirty boards, where some paths are broken and replaced with the prolongation of the resistors or capacitors. Also soldering points look bad.
All contacts are working well and the nearly 30 years old unit sounds great.
Since a few years I'm wondering if I should make a complete resauration: make a new circuit board and move all parts from the old board to the new one. I'm though mostly interested in the sound quality.
All contacts are working well and the nearly 30 years old unit sounds great.
Since a few years I'm wondering if I should make a complete resauration: make a new circuit board and move all parts from the old board to the new one. I'm though mostly interested in the sound quality.
It's a common repair to use component legs to bridge broken pads or tracks and works fine, as good as the original track.
If it ain't broke then don't fix it! You are more likely to damage parts desoldering them and transferring to a new PCB, the result may be unreliable.
If it ain't broke then don't fix it! You are more likely to damage parts desoldering them and transferring to a new PCB, the result may be unreliable.
As long as there is no damage, good physical attachment and electrical conduction of the components, it is down to poor service work but only esthetic issues.
Depending on the pollution level and type high voltages may track across the PCB, especially if the crud is hydroscopic or holds moisture. This depends on the creepage and clearance distances used, today for pollution level 3 the creepage distance for mains is 8mm....
The flux resin doesn't need to be washed away. Just leave it unless it is a very high voltage circuit. The thingies we create today might be top of the art today - the rest you know anyway... 😉
Actually I will disagree with that, all flux should be cleaned of PCBs even no clean flux, it is best practice even with no clean fluxes.
Thanks I might be able to sleep 10 minutes longer per night. 😀
Could this have influence on sound?
Could this have influence on sound?
Not sure what type of tubes you have there, but in the upper left socket in your photo, if it's a typical dual triode, then the pin 2 connection is a grid, and I see some schmutz on the PCB from there to the pin 3 connection, which might be a cathode. (The schmutz is around 3 o'clock, to the right of the socket by that 'y-ed' trace.) This could pessimistically result in odd bias to the grid. Simple solution: some very clean flux remover and a Q-tip can remove the charred flux and junk, and prevent possible problems.
Again, just a conjecture - I have no idea what sort of tube is in that socket! However, dual triodes are popular, and that pinout would be as I described. Otherwise, nothing else looks awful or particularly fatal. A simple cleanup would certainly eliminate all possible problems for quite a while though…
Regards,
Again, just a conjecture - I have no idea what sort of tube is in that socket! However, dual triodes are popular, and that pinout would be as I described. Otherwise, nothing else looks awful or particularly fatal. A simple cleanup would certainly eliminate all possible problems for quite a while though…
Regards,
Not pretty, but functional, the crud looks like its where re-work has been done, a couple of minutes with an old tooth brush and some iso will solve a lot of issues with the looks.
First of all, thanks for your help.
The tube on the upper left side is a 6CG7 the others are 6JD8.
Any flux remover is ok, I suppose, I have to see if I have any at home.
I suppose I should also use some silicon rubber to "glue" the capacitors (Mundorf SGO) to the circuit board and chassis so they don't vibrate.
The tube on the upper left side is a 6CG7 the others are 6JD8.
Any flux remover is ok, I suppose, I have to see if I have any at home.
I suppose I should also use some silicon rubber to "glue" the capacitors (Mundorf SGO) to the circuit board and chassis so they don't vibrate.
what is iso?
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