Re: W4 has 1N34A available for it.
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Amazon will sell us all the 1N34A's we want and the prices are inexpensive, about 60 cents each with free delivery for Prime members.
[Edited Message Follows]
Germanium Diodes are used for Rectification/Detection (RF¡ª> DC)
in RF/SWR meters (and Antenna Tuners with Internal meters) due to low voltage drop (0.3V).
Common Germanium Diodes are: 1N34(A), 1N60, 1N270, and 1N295.
These Germanium Diodes DIFFER in their Voltage and Current Ratings.
DRAKE frequently used the 1N270 diode in many of their Antenna Tuners, Wattmeters.
==
Schottky Diodes (1N5819,?BAT41, BAT43), can be Substituted for Germanium diodes?
due to similar Low Voltage Drop (0.3-0.5V).? Silicon not suitable (0.7 V drop).
** At the millennium, with RoHS mfg. conversion, many types of Germanium diodes disappeared. **
Through-hole reduction, due to Surface Mount replacement, also a production issue.
¡ª
Central Semiconductor CDSH270 was a Schottky Diode designed to replace the 1N270 Germanium diode.
100V, 100mA, through-hole, DO-35 package Schottky diode.
Central Semi Discontinued, after a ~15 year production run.
Some advantages over the 1N270 are lower forward voltage, lower leakage current,
faster switching speed, and a more robust package.
greg, w9gb
-- Frank Barnes
W4NPN
Chapel Hill, NC
Grid Square FM05
Cell 919.260.7955
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