[ARC5] Russian radio construction techniques

[Brian]

Hello Dave,

There is another hypothesis:

Early on in the WWII fracas, the average life of an aircraft and its crew 
was measured in weeks. So, all that high quality soldering was going to 
waste. Later, as RDF and RADAR emerged, the life of an aircraft increased 
along with its piston-engined power and flight ceiling, but pressurisation 
and warmed aircraft did not emerge till much later. Consequently, the 
shortcomings of soldered joints became a problem - thermal cycling, 
vibration. So, some nations moved away from soldering to a more robust form 
of connection.

What is your evidence for the change in lead content of solder during WWII? 
Reducing lead in solder does increase its hardness, but not much ~ 10% at 
most; however, such reduction reduces strength. Reducing lead away from the 
eutectic point increases the melt temperature. Hardness is usually the 
result of additives, such as manganese and copper.

Let's be very careful with respect to Joseph Stalin. During WWII, Stalin was 
on the side of the US and the UK in defeating Germany. Soviet Russia had 
huge raw material resources as a result of the amalgamation of the 
previously warring little states. The USA had a long love affair with 
Communism in the 1920s right up to February 1950 with the rise of another 
Joseph - McCarthy -  of all US politicians probably the one with the lowest 
IQ and ethical stance.

73 de Brian, VK2GCE.

On Thursday, March 31, 2016 11:02 PM , you said:


----- Original Message ----- 
From: <robinson at tuberadio.com>

> Some of the German WW2 radios were done this way.

I think that supports my hypothesis that it was
a shortage of lead and tin.
If you put a TBY-2 next to a TBY-8, you'll find
the solder in the late-war -8 is far harder to melt
and lower quality than that used in the earlier -2.
The difference is the amount of lead in the mix,
lead going to bullets of course.
If Uncle Scam was short of lead, how much
more the Germans in WWII  or Russia under
Uncle Joe's 1950s socialism?