-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 MRsmSQrGrvBSsILaVteRbpMbPBOI55vEBQM2CCDPi8f4js0B42Z7fvKq9Tes51Gg
 OESUWMwKez+CU5h3RFA/yQ==

<SEC-DOCUMENT>0001333922-05-000001.txt : 20050725
<SEC-HEADER>0001333922-05-000001.hdr.sgml : 20050725
<ACCEPTANCE-DATETIME>20050725144003
ACCESSION NUMBER:		0001333922-05-000001
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050721
FILED AS OF DATE:		20050725
DATE AS OF CHANGE:		20050725

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CAMBEX CORP
		CENTRAL INDEX KEY:			0000016590
		STANDARD INDUSTRIAL CLASSIFICATION:	COMPUTER STORAGE DEVICES [3572]
		IRS NUMBER:				042442959
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		115 FLANDERS ROAD
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581
		BUSINESS PHONE:		508-983-1200

	MAIL ADDRESS:	
		STREET 1:		115 FLANDERS ROAD
		STREET 2:		.
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CAMBRIDGE MEMORIES INC
		DATE OF NAME CHANGE:	19801204

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Spain Robert J
		CENTRAL INDEX KEY:			0001333922

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-06933
		FILM NUMBER:		05971075

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		508-983-1200

	MAIL ADDRESS:	
		STREET 1:		C/O CAMBEX CORPORATION
		STREET 2:		115 FLANDERS ROAD
		CITY:			WESTBOROUGH
		STATE:			MA
		ZIP:			01581
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-07-21</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0000016590</issuerCik>
        <issuerName>CAMBEX CORP</issuerName>
        <issuerTradingSymbol>CBEX</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001333922</rptOwnerCik>
            <rptOwnerName>Spain Robert J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O CAMBEX CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>115 FLANDERS ROAD</rptOwnerStreet2>
            <rptOwnerCity>WESTBOROUGH</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>01581</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Cambex Corporation Common Stock, par value $0.10</value>
            </securityTitle>
            <transactionDate>
                <value>2005-07-21</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>218333</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0.15</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>218333</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">converted $32,750 due from Cambex Corporation into stock</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Robert J Spain</signatureName>
        <signatureDate>2005-07-25</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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