bonjour à tous, just joining this intéressant thread now.
First used soldering irons in 1950s, was Ungar.
As an Engineer and consultant, 1970s..1990s, TH prototypes, power supplies, analog,
1/Préfère vintage Hakko analog 926, 936, (photo 1) workhorses, no failures in decades, good temp régulation and safety. Used only genuine Hakko tips
Good cable, great tips, comfortable handle design.
I had not used the newer digital Hakko yellow..blue.
2/ Wellers, were OK, but nothing special,
No opinion on Pace or desolder stations.
3/ 1990..1993 I consulted for Raychem/Metcal, to design the 500 kHz resonant current drive SP-200 station for their SmartHeat (tm) system tips.
photo 2
The Metcal patent uses induction heating in the tip material rather than a separate heater and thermostat or thermocouple.
Very long lasting tips and handles, my 1993 versions are still in service!
The Metcal tip temperature is tightly regulated, fixed by a controlled curie point of tip material.
Design goal similar performance as the original 13.5 MHz versions, without the issues of the coax cable, connector and less chance of RF interference.
We had to achieve fast warmup, 20 second max from cold to 90% temp,
Temp at tip was tested for the temp/time curve with a special thermocouple implanted inside the solder tip
4/ Metcal has the Best control of temperature even for massive ground plane or thick Power supply leads and wires. Great for power and SMD rework
My design for Metcal SP-200 became a classic, 100s k units sold, licensed to OK industry and Tech Tool.
photo 3
5/The older 13.5 MHz versions coax connectors can be mismated. I think the performance is similar to the 500 kHz., which used a 4 pin DIN connector.
I am now happily retired, I still have my SP-200 prototypes and Metcal stations and tips. The alternative is Hakko 936.
Just the ramblings of an old retired EE...
happy soldering...
Bon courage
Jon