[Elecraft] KPA500 T/R mod - replacement fpr Q5 BU941T

[Dr. William J. Schmidt]

Obsolescence isn't that important because the big surplus warehouses around
the world still stock them.  Try Octopart or your other favorite inquiry
tool to see stock in many places around the world.


Dr. William J. Schmidt - K9HZ J62K(J68HZ) 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ
PJ2/K9HZ VP2EHZ

Owner - Operator
Big Signal Ranch – K9ZC
Staunton, Illinois

Owner – Operator
Villa Grand Piton – J68HZ
Soufriere, St. Lucia W.I.
Rent it: www.VillaGrandPiton.com

Moderator: North American QRO Group at Groups.IO.
Moderator: Amateur Radio Builders Group at Groups.IO.
President – Walt Johler Memorial Amateur Radio Club – W9FD.

email:  bill at wjschmidt.com


-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On
Behalf Of Andy Durbin via Elecraft
Sent: Friday, November 14, 2025 4:53 PM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA500 T/R mod - replacement fpr Q5 BU941T

I took a closer look and the BU931T does not seem to be available at Mouser
or Digikey.   BU931P was designed for the same application (automotive
electronic ignition)  and all the specs I compared were equal to, or better
than, the BU931T.

It seems the P version is scheduled to go obsolete too but it is in stock at
Mouser.

Elecraft is still selling and repairing the KPA500.  It would be interesting
to know if Q5 was changed to a different type or if they have a lifetime
stock of the BU931T.

Andy, k3wyc

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