[Hallicrafters] S-5 Super Skyrider Wire Testing.

[Bill Gerhold]

I just did an OCR read of an interesting part of the S-5 sales brochure and
was struck by the way Hallicrafters
touted the testing of the wire that went into their receiver.

Check out the testing done on the wiring and especially how the voltage
breakdown of the wire insulation was tested towards the end of this
document.

K2WH

Attachment Follows:

Special Wire Employed

Another important feature of the Super SKY¬RIDER pre-selector is the special
wiring employed. This is a special cellulose acetate insulated wire which
provides the highest known high insulation re¬sistance, low radio frequency
phase difference with increased humidity, high voltage breakdown strength
and low moisture absorption.
Tests run on this typo insulation in comparison with ordinary cotton or silk
insulation are shown in the following three tables.

Table No. I

Insulation: 2 Cotton Braids Waxed
At 74° F. 90% R. H.	At 120° F. 38% R. H.
for 100 Hours	for 100 Hours
Insulation Res.	Insulation Res.
0.29 Megs. Per Ft.	8.8 Megs. Per Ft.

Moisture Absorption	Moisture Absorption
0.94%	Infinity

Power Factor	Power Factor
6.63%			0.08

Average voltage breakdown at room temperature:
1925 volts.

Table No. 2
Insulation: 2 Silk Wraps Plus I Cotton Braid Waxed

At 74° F. 90% R. H.	At 120° F. 38% R. H.
for 100 Hours	for 100 Hours
Insulation Res.	Insulation Res.
515 Megs. Per Ft.	557 Megs. Per Ft.

Moisture Absorption	Moisture Absorption

0.94%	Infinity
Power Factor	Power Factor
6.93%	0.17°/

Average voltage breakdown at room temperature:

2100 volts.
 

Table No. 3
Insulation: 2 Wraps Cellulose-Acetate-Treated
Textile Plus I Cotton Braid Waxed
	At 74° F. 90% R. H.	At 120° F. 38% R. H.	f
	for 100 Hours	for 100 Hours
	Insulation Res.	Insulation Res.
	1792 Megs. Per Ft.	2083 Megs. Per Ft.

		Moisture Absorption	Moisture Absorption
	0.94%			Infinity
	Power Factor	Power Factor
	6.68%			0.15
Average voltage breakdown at room temperature:
2800 volts.

Note: In each of the three tables, insulation and voltage breakdown was
measured on one-foot samples immersed in mercury. Moisture absorption by
weight. Power factor measured at 1000 KC. These tests were made for us by A.
R. McLellan, Consulting Engineer.

It will be seen, then that every step known to the radio art has been taken
to the end that the Super SKYRIDER will provide the absolute perfection of
pre-amplification, insofar as engineering skill, ex¬perience and high
purpose may permit. No expense or care has been spared, no compromise
whatever has been made in producing this most important stage in this fine
receiver.