Exhibit 99.1

              HEI, Inc. Announces Second Quarter Conference Call

    MINNEAPOLIS, April 8 /PRNewswire-FirstCall/ -- HEI, Inc. (Nasdaq: HEII)
( www.heii.com ) will hold its quarterly conference call to discuss the
financial results of the second quarter of fiscal year 2004 on Tuesday,
April 13, 2004 at 4:00 pm Eastern Time (3:00 pm Central Time).

    This call is being web cast and is also accessible via telephone.  To
access the listen-only webcast, visit http://www.actioncast.acttel.com .  The
conference call can be accessed via telephone by dialing 1-800-218-8862
(outside the US, dial 303-262-2211).  Specify conference reservation number
576607.

    Replays of the conference call will be available April 13, 2004 at 5 pm
Central Time through midnight May 13, 2004, by calling 1-800-405-2236 (outside
the US, dial 303-590-3000).  Specify conference reservation number 576607.

    Information for accessing the conference call is also available on the
HEI's web site at www.heii.com .

    HEI, Inc. designs, develops and manufactures microelectronics, subsystems,
systems, connectivity and software solutions for OEMs engaged in the medical
equipment and medical device, hearing, communications and RFID industries.
HEI provides its customers with a single point of contact that can take an
idea from inception to a fully functional, cost effective and
manufacturability product utilizing innovative design solutions and by the
application of state-of-the-art materials, processes and manufacturing
capabilities.

     Investor Relations &                 PO Box 5000, 1495 Steiger Lake Lane,
      Microelectronics Operations          Victoria, MN  55386
     Advanced Medical Operations          4801 North 63rd Street,
                                           Boulder CO  80301
     High Density                         610 South Rockford Drive,
      Interconnect Operations              Tempe, AZ  85281
     RF Identification and                1546 Lake Drive West,
      Smart Card Operations                Chanhassen, MN  55317


    FORWARD-LOOKING INFORMATION

    Information in this news release, which is not historical, includes
forward-looking statements made pursuant to the safe harbor provisions of the
Private Securities Litigation Reform Act of 1995.  Statements contained in
this press release, including the implementation of business strategies,
including a stronger sales emphasis; growth of specific markets; improved
results, profitability, cash flow, margins, and revenues; and estimated HEI
revenues, cash flow, expenses and profits, are forward-looking statements.
All of such forward-looking statements involve risks and uncertainties
including, without limitation, continuing adverse business and market
conditions, the ability of HEI to secure and satisfy customers, the
availability and cost of materials from HEI's suppliers, HEI's ability to
satisfy financial or other obligations or covenants set forth in its banking
agreements, adverse competitive developments, change in or cancellation of
customer requirements, the integration of the Advanced Medical Operations,
collection of outstanding debt, HEI's ability to succeed on the merits and
defend against litigation, and other risks detailed from time to time in HEI's
SEC filings.  HEI undertakes no obligation to update these statements to
reflect ensuing events or circumstances, or subsequent actual results.

SOURCE  HEI, Inc.
    -0-                             04/08/2004
    /CONTACT:  Mack V. Traynor III, CEO, or Douglas J. Nesbit, CFO, both of
HEI, Inc., +1-952-443-2500/
    /Web site:  http://www.heii.com /
    (HEII)

CO:  HEI, Inc.
ST:  Minnesota
IN:  CPR HRD SEM STW MTC NET
SU:  CCA MAV