[AMRadio] Strange rectifier configuration - UPDATE

Clarke, Tom AIR4.0P NATOPS frederic.clarke at navy.mil
Fri Jan 23 10:17:28 EST 2009

Looks like they are after two different regulated voltages - 182 v and
150 v.  I don't know how critical it would be but using 100v zeners
would be a bit out of range - 18v high and 50 v high.


-----Original Message-----
From: M. K. Hess [mailto:mkhess at frontiernet.net] 
Sent: Friday, January 23, 2009 9:21
To: amradio at mailman.qth.net
Subject: [AMRadio] Strange rectifier configuration - UPDATE

As an Addition.....

If you'd like to see the full schem. of the unit. Check here on my

Here's the link to the FULL scem.




Hi Folks,

I'm working on the audio 1st stage of a Gates BC-1H transmitter. It has
rectifier with 4 zener diodes
however, unlike most set ups where there are 4 of the same diode, this
using 3 different types, all
of the same class, but with just a wee bit different specs....

It's using:
2x 1N3337A - 75V Zener (540 mA max, 56 Vrev Max)
1x 1N3338A - 82V Zener (490 mA max, 62.2 Vrev Max)
1x 1N3340A - 100v Zener (400 mA max, 76 Vrev Max)

I only note above where the values are significantly different....

I'm just curious... Why do it with these 3 different diodes??? 
What does that buy them?

Would the world end if I used 4 of the 1N3340A - 100V Zeners (since I
have a
slug of them in my parts box) as replacements??

Your sage wisdom is appreciated!

Mike - N3EAQ

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