It was suggested that it might be worthwhile posting my experience as a Guinea Pig 😉, but first a BIG THANKS to all who have made this project possible! The level of professionalism and dedication exhibited should be an example to other companies, especially those in the retail segment.
So far my build is moving along nicely, pic to follow, but I wanted to mention a couple of things that I have discovered. First off, though I am using Kester solder w/ rosin, I still prefer the look of the finished product more when flux has been added. In general I'm finding that the less flux the better, it is still a PIA to clean off.
For those who are having difficulties getting some components to line up nicely, things like LEDs, Jumpers etc. I find that putting the slightest touch of solder on 1 hole, heating it and inserting a leg, with LEDs obviously the long leg, till it is properly aligned, solder the other hole then touching up the first joint.
So far my build is moving along nicely, pic to follow, but I wanted to mention a couple of things that I have discovered. First off, though I am using Kester solder w/ rosin, I still prefer the look of the finished product more when flux has been added. In general I'm finding that the less flux the better, it is still a PIA to clean off.
For those who are having difficulties getting some components to line up nicely, things like LEDs, Jumpers etc. I find that putting the slightest touch of solder on 1 hole, heating it and inserting a leg, with LEDs obviously the long leg, till it is properly aligned, solder the other hole then touching up the first joint.
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I clean off rosin flux with acetone. Neither rosin or acetone is friendly but you can work in ways to avoid inhaling it all.
Currently using Chemtronics, 90% Alcohol and distilled water rinse. Wonder how the Chemtronics compares to acetone as far as noxious chemicals?
Making slow but steady progress, PNP/NPN transistors installed. With these 3 legged components I use the previously mentioned method , but cut the leg with the pre-soldered pad, a skosh shorter than the other 2.
Closing in on the finish line, for this phase, then on to @rhthatcher PS and @Gianluca chassis. Very exciting!
look can be deceiving
anyhow, if additional application of flux is helping you to solder properly, then use it .... then clean
with time and more mileage in soldering, you'll use flux only for smd work
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there is shorter and more proper way, for components totally aligning with pads, thus being loose prior to soldering - either use Patrick's/6L6's trick with paper-tape ......... or do it as Geezers - keep part in place with 1 finger, having pcb in hand and applyu smal blob on solder with iron tip on one pad
then place pcb on the bench and solder second leg then re-do first one
less heating cycles, the better, even with most sturdy components
watching few ootoobe tutorials can be extremely useful, especially those seeing some Geezer doing regular repair job, not especially soldering tutorial
remember - for ooomphteentht time - better to err to bigger tip ( than necessary) , and better to err to higher temp ( than necessary)
you'll be surprised to see Papa's bench - soldering iron size of medium size anvil, cranked to sun surface temp
Thanks ZM, I've tried the tape and holding with 1 finger, I guess practice makes....I assume 700F is hot enuf?
always think of part and construction benefit ....
in short - best way is not always easiest way
and best way with time often becomes easiest
in short - best way is not always easiest way
and best way with time often becomes easiest
Hopefully learned a valuable lesson, I had pretty much hit the wall but wanted to get more done, Oops! Skipped a step in the guide of measuring the pots for TP1 and 2 prior to installing. Oh well, after some patient hand holding by @ItsAllInMyHead I'm back on track. Lesson, pace myself and enjoy the journey.
when I was young and naïve, I didn't need bloody manual/building guide for amp (and often paid the price for not needing it)
now, when I'm just naïve, if I have properly written manual/guide, combined with worthy schematic ....... I don't even feel the need to build an amp
reading it and re-reading it all and building it mentally is perfectly enough
ha!
can you guess how many times I built Papa's/Thagard's A75??
now, when I'm just naïve, if I have properly written manual/guide, combined with worthy schematic ....... I don't even feel the need to build an amp
reading it and re-reading it all and building it mentally is perfectly enough
ha!
can you guess how many times I built Papa's/Thagard's A75??
Well, life has a way of getting in the way, here are some photos of the boards prior to mounting to the heat sinks.
