[Hallicrafters] The 8122, 6146, 6HF5, and 6KD6 Enigma

[Jim Liles]

Hi Lee,

The 1N270 is a perfect replacement.  It simply has a lot less leakage and 
higher reverse voltage tolerance.  The 1N914 is also a good one.  The 1N400X 
are silicone rectifiers for power supplies and the 1N459A is silicone for RF 
use --- use em to replace 1N456 in Hal products.

Good luck with the HT-32B    Kindest regards Jim K9AXN

-----Original Message----- 
From: Lee via Hallicrafters
Sent: Saturday, March 14, 2015 10:49 AM
To: hallicrafterssr2000 at k9axn.com ; hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] The 8122, 6146, 6HF5, and 6KD6 Enigma


Jim, (or anyone)
I am going to put in the ALC mod in the HT-32B soon....
The article calls for 1N34A diodes....

I have some:
1N4001
1N4002
1N4004
1N4005
1N4007

1N914

1N459A
1N270

Will any of these work OK?

73,
Lee






-----Original Message-----
From: Jim Liles <hallicrafterssr2000 at k9axn.com>
To: hallicrafters <hallicrafters at mailman.qth.net>
Sent: Thu, Mar 12, 2015 5:57 pm
Subject: [Hallicrafters] The 8122, 6146, 6HF5, and 6KD6 Enigma


The following information will help to understand why vacuum tubes behave as
they do.  We focus on the 8122 used in Class AB1 service as well as just 
about
any tube used under Class parameters.  What you’ll find is tubes like the 
6146,
6HF5, 6KD6, and others have the same frailties and strengths as the 8122.

If
you are restoring or servicing any vintage transmitter or transceiver you 
will
find the following link to be interesting and it will save you a good deal 
of
grief.  If nothing else, it will help to understand the idiosyncrasy's and 
some
times bizarre behavior of these tubes and how to cope with them.


http://k9axn.com/_mgxroot/page_10868.html

If it is unclear please send a note
so we can correct the language.

Kindest regards Jim
K9AXN

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