UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM 10-Q

(Mark One)

[x]      Quarterly report pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934 For the quarterly period ended

                                 MARCH 31, 2004

[ ]      Transition report pursuant to Section 13 or 15(d) of the Securities
         Exchange Act of 1934  For the transition period from _____  to  ______

                         Commission File Number: 0-13807

                            CABLE TV FUND 12-B, LTD.
                Exact name of registrant as specified in charter


                  Colorado                                84-0969999
        ---------------------------             ----------------------------
         State of organization                       I.R.S. employer I.D. #


                             c/o Comcast Corporation
                 1500 Market Street, Philadelphia, PA 19102-2148
- --------------------------------------------------------------------------------
                      Address of principal executive office

                                 (215) 665-1700
- --------------------------------------------------------------------------------
                          Registrant's telephone number

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant was required to file such reports),  and (2) has been subject to such
filing requirements for the past 90 days.


             Yes  X                                             No
                -----                                             ------

Indicate by check mark whether the registrant is an accelerated filer (as
defined in Rule 12-b2 of the Exchange Act).


             Yes                                                No  X
                -----                                             ------








                                   CABLE TV FUND 12-B, LTD.
                                   ------------------------
                                    (A Limited Partnership)

                                    CONDENSED BALANCE SHEET
                                          (Unaudited)


                                ASSETS                         March 31,        December 31,
                                ------                            2004              2003
                                                            -------------      -------------

                                                                         
Cash ..................................................     $          17      $          17
                                                            -------------      -------------

              Total assets ............................     $          17      $          17
                                                            =============      =============


                   LIABILITIES AND PARTNERS' CAPITAL

Commitments and Contingencies (Note 3)

PARTNERS' CAPITAL:
General Partner-
     Contributed capital ..............................     $       1,000      $       1,000
     Advances from affiliates .........................            43,218             34,027
     Distributions ....................................       (19,696,268)       (19,696,268)
     Accumulated earnings .............................        19,652,067         19,661,258
                                                            -------------      -------------

                                                                       17                 17
                                                            -------------      -------------

Limited Partners-
     Net contributed capital (111,035 units outstanding
         at March 31, 2004 and December 31, 2003) .....        47,645,060         47,645,060
     Distributions ....................................      (114,620,017)      (114,620,017)
     Accumulated earnings .............................        66,974,957         66,974,957
                                                            -------------      -------------


                                                            -------------      -------------

              Total liabilities and partners' capital .     $          17      $          17
                                                            =============      =============




See notes to condensed financial statements




                                               1






                                                                   

                                   CABLE TV FUND 12-B, LTD.
                                   ------------------------
                                    (A Limited Partnership)

                               CONDENSED STATEMENT OF OPERATIONS
                               ---------------------------------
                                          (Unaudited)

                                                                        Three Months Ended
                                                                             March 31,

                                                                        2004           2003
                                                                     ---------      ---------

OTHER INCOME (EXPENSE):
     Interest income............................................      $              $     53
     Administrative expenses and other .........................        (9,191)        (8,576)
                                                                     ---------      ---------

NET LOSS .......................................................     ($  9,191)     ($  8,523)
                                                                     =========      =========

ALLOCATION OF NET LOSS:
     General Partner ...........................................     ($  9,191)     ($  2,131)
                                                                     =========      =========

     Limited Partners...........................................      $             ($  6,392)
                                                                     =========      =========

NET LOSS PER LIMITED
     PARTNERSHIP UNIT...........................................      $             ($   0.06)
                                                                     =========      =========

WEIGHTED AVERAGE NUMBER OF LIMITED
     PARTNERSHIP UNITS OUTSTANDING .............................       111,035        111,035
                                                                     =========      =========


See notes to condensed financial statements.



                                               2








                                                                        


                                   CABLE TV FUND 12-B, LTD.
                                   -------------------------
                                    (A Limited Partnership)

                               CONDENSED STATEMENT OF CASH FLOWS
                               ---------------------------------
                                          (Unaudited)



                                                                  Three Months Ended
                                                                      March 31,

                                                                   2004          2003
                                                                --------      --------

CASH FLOWS FROM OPERATING ACTIVITIES:
     Net loss .............................................     ($ 9,191)     ($ 8,523)
     Adjustments to reconcile net loss to net cash
         provided by operating activities:
              Increase in advances from affiliates ........        9,191         8,576
                                                                --------      --------

                  Net cash provided by operating activities                         53

Cash, beginning of period .................................           17        21,193
                                                                --------      --------

Cash, end of period .......................................     $     17      $ 21,246
                                                                ========      ========


See notes to condensed financial statements.



                                               3







                            CABLE TV FUND 12-B, LTD.
                            -----------------------
                             (A Limited Partnership)

                     NOTES TO CONDENSED FINANCIAL STATEMENTS
                     ---------------------------------------
                                   (Unaudited)


(1) The condensed balance sheet of Cable TV Fund 12-B, Ltd. (the  "Partnership")
as of December 31, 2003 has been derived  from the audited  balance  sheet as of
that date. The  Partnership's  condensed  balance sheet as of March 31, 2004 and
its condensed  statements  of operations  and of cash flows for the three months
ended March 31, 2004 and 2003 are unaudited.  In the opinion of management,  all
adjustments  necessary to present fairly the Partnership's  financial  position,
results of  operations  and cash flows as of March 31,  2004 and for all periods
presented have been made.

         Certain  information  and note  disclosures  normally  included  in the
Partnership's annual financial statements prepared in accordance with accounting
principles  generally  accepted  in the United  States  have been  condensed  or
omitted. These condensed financial statements should be read in conjunction with
the  financial  statements  and  notes  thereto  included  in the  Partnership's
December  31,  2003  Annual  Report on Form 10-K filed with the  Securities  and
Exchange Commission. The results of operations for the interim periods presented
are not necessarily indicative of operating results for the full year.

         The  Partnership  owns no properties.  The Partnership has continued in
existence because of pending litigation in which the Partnership is a party (see
Note 3).

         The  quarterly  financial  information  has not  been  reviewed  by the
Partnership's independent public accountants because the registrant qualified as
an inactive registrant for its most recent fiscal year.

(2) The  Partnership  reimburses  its  general  partner  for  certain  allocated
administrative  expenses.  These  expenses  represent  the  salaries and related
benefits paid for corporate  personnel.  Such personnel provide tax and investor
relations services to the Partnership.  Such services,  and their related costs,
are necessary for the administration of the Partnership until the Partnership is
dissolved.  Such charges were included in  administrative  expenses and other in
the  accompanying  condensed  statement of operations.  Administrative  expenses
allocated to the  Partnership for the three months ended March 31, 2004 and 2003
were $618 for each period.

         The  Partnership  does not have  enough cash to  reimburse  the general
partner for any administrative expenses incurred prior to the dissolution of the
Partnership.  Because the Partnership's  cash supply is inadequate to cover such
costs,  the  General  Partner  will be  required  to pay for any  shortfall.  In
addition, all amounts to be paid as a result of the settlement described in Note
3 are the responsibility of the General Partner.

(3) Commitments and Contingencies

Litigation Challenging Jones Intercable's Acquisitions of Certain Cable Systems

         In  June  1999,  Jones  Intercable  was  named  a  defendant  in a case
captioned City  Partnership  Co.,  derivatively on behalf of Cable TV Fund 12-C,
Ltd.,  Cable TV Fund 12-D, Ltd. and Cable TV Fund 12-BCD  Venture,  plaintiff v.
Jones  Intercable,  Inc.,  defendant and Cable TV Fund 12-C, Ltd., Cable TV Fund
12-D, Ltd. and Cable TV Fund 12-BCD Venture,  nominal defendants (U.S.  District
Court,   District  of  Colorado,   Civil  Action  No.   99-WM-1155)  (the  "City
Partnership"  case) brought by City  Partnership  Co., a limited  partner of the
named  partnerships.  The plaintiff's  complaint  alleges that Jones  Intercable
breached its fiduciary  duty to the plaintiff and to the other limited  partners
of the  partnerships and to the Venture in connection with the Venture's sale of
the Palmdale,  California cable communications system (the "Palmdale System") to
a subsidiary of Jones  Intercable in December 1998.  The complaint  alleges that
Jones Intercable  acquired the Palmdale System at an unfairly low price that did
not accurately  reflect the market value of the Palmdale  System.  The plaintiff
also  alleges  that the proxy  solicitation  materials  delivered to the limited
partners  of the  partnerships  in  connection  with the  votes  of the  limited
partners on the Venture's sale of the Palmdale System  contained  inadequate and
misleading  information  concerning the fairness of the  transaction,  which the
plaintiff  claims caused Jones Intercable to breach its fiduciary duty of candor
to the limited  partners and which the  plaintiff  claims  constituted  acts and
omissions in violation of Section 14(a) of the Securities  Exchange Act of 1934,
as amended. Plaintiff also claims that Jones Intercable breached the contractual
provision of the partnerships' limited partnership agreements requiring that the
sale  price  be  determined  by  the  average  of  three  separate,  independent
appraisals, challenging both the independence and


                                        4




                            CABLE TV FUND 12-B, LTD.
                            ------------------------
                             (A Limited Partnership)

               NOTES TO CONDENSED FINANCIAL STATEMENTS - CONTINUED
               ---------------------------------------------------
                                   (Unaudited)

the  currency  of  the  appraisals.  The  complaint  finally  seeks  declaratory
injunctive   relief  to  prevent  Jones   Intercable  from  making  use  of  the
partnerships' funds to finance Jones Intercable's defense of this litigation.

         In  August  1999,  Jones  Intercable  was named a  defendant  in a case
captioned  Gramercy  Park  Investments,  LP,  Cobble  Hill  Investments,  LP and
Madison/AG  Partnership Value Partners II, plaintiffs v. Jones Intercable,  Inc.
and Glenn R.  Jones,  defendants,  and Cable TV Fund 12-B,  Ltd.,  Cable TV Fund
12-C, Ltd., Cable TV Fund 12-D, Ltd., Cable TV Fund 14-A, Ltd. and Cable TV Fund
14-B, Ltd., nominal defendants (U.S. District Court, District of Colorado, Civil
Action  No.  99-B-1508)  (the  "Gramercy  Park"  case)  brought  as a class  and
derivative action by limited partners of the named partnerships. The plaintiffs'
complaint  alleges that the defendants  made false and misleading  statements to
the  limited  partners  of  the  named   partnerships  in  connection  with  the
solicitation  of proxies and the votes of the  limited  partners on the sales of
the Palmdale System,  the Albuquerque,  New Mexico cable  communications  system
(the  "Albuquerque  System"),  the Littlerock,  California cable  communications
system  (the  "Littlerock  System")  and  the  Calvert  County,  Maryland  cable
communications system (the "Calvert County System") by the named partnerships to
Jones  Intercable or one of its  subsidiaries in violation of Sections 14 and 20
of the Securities Exchange Act of 1934, as amended. The plaintiffs  specifically
allege that the proxy statements delivered to the limited partners in connection
with the  limited  partners'  votes on these sales were  false,  misleading  and
failed to disclose  material  facts  necessary to make the  statements  made not
misleading.  The plaintiffs' complaint also alleges that the defendants breached
their  fiduciary  duties to the plaintiffs and to the other limited  partners of
the named  partnerships  and to the named  partnerships  in connection  with the
various sales of the Albuquerque  System,  the Palmdale  System,  the Littlerock
System and the Calvert County System to  subsidiaries of Jones  Intercable.  The
complaint  alleges that Jones  Intercable  acquired  these cable  communications
systems at unfairly low prices that did not accurately reflect the market values
of the  systems.  The  plaintiffs  seek on their own behalf and on behalf of all
other limited partners  compensatory and nominal damages, the costs and expenses
of the  litigation,  including  reasonable  attorneys'  and experts'  fees,  and
punitive and exemplary damages.

         In September  1999,  Jones  Intercable  was named a defendant in a case
captioned Mary Schumacher,  Charles McKenzie and Geraldine Lucas,  plaintiffs v.
Jones  Intercable,  Inc. and Glenn R. Jones,  defendants and Cable TV Fund 12-B,
Ltd.,  Cable TV Fund 12-C,  Ltd.,  Cable TV Fund 12-D, Ltd., Cable TV Fund 14-A,
Ltd. and Cable TV Fund 14-B,  Ltd.,  nominal  defendants  (U.S.  District Court,
District of Colorado,  Civil Action No. 99-WM-1702)  ("Schumacher") brought as a
class and derivative action by three limited partners of the named partnerships.
The  substance  of  the  Schumacher  plaintiffs'  complaint  is  similar  to the
allegations raised in the Gramercy Park case.

         In September  1999,  Jones  Intercable  was named a defendant in a case
captioned Robert Margolin, Henry Wahlgren and Joan Wahlgren, plaintiffs v. Jones
Intercable,  Inc. and Glenn R. Jones,  defendants and Cable TV Fund 12-B,  Ltd.,
Cable TV Fund 12-C, Ltd., Cable TV Fund 12-D, Ltd., Cable TV Fund 14-A, Ltd. and
Cable TV Fund 14-B, Ltd., nominal defendants (U.S.  District Court,  District of
Colorado,  Civil  Action  No.  99-B-1778)  ("Margolin")  brought  as a class and
derivative  action by three  limited  partners  of the named  partnerships.  The
substance of the Margolin  plaintiffs'  complaint is similar to the  allegations
raised in the Gramercy Park case.

         In November 1999, the United States  District Court for the District of
Colorado  entered  an order  consolidating  all of the cases  challenging  Jones
Intercable's acquisitions of the Albuquerque,  Palmdale,  Littlerock and Calvert
County Systems because these cases involve common questions of law and fact. The
cases are  presented as both class and  derivative  actions.  In June 2001,  the
plaintiffs filed a motion for class  certification.  In August 2001, the General
Partner  filed  a  brief  in  opposition   to   plaintiffs'   motion  for  class
certification.  In September 2002, the court granted the plaintiffs'  motion for
class certification.

         On June 25, 2003,  the parties  agreed to the terms of a settlement  of
this litigation and entered into a written settlement  agreement,  and notice of
the settlement was sent to the limited partners on August 5, 2003. Because these
are class and derivative actions,  the settlement must be approved by the court.
On  October  14,  2003,  the judge  issued a  Recommendation  of  United  States
Magistrate  Judge,  in which he recommended to the United States  District Court
judge that the settlement be approved.  On November 10, 2003, the judge accepted
the  recommendation and approved the settlement,  but withheld  determination of
the  reasonableness  of the  attorneys'  fees and costs  pending  the receipt of
further  evidence  from  the  plaintiffs'  counsel.  Within  thirty  days of the
approval of the  plaintiff's  counsel's  request for an award of attorneys' fees
and costs, Comcast will cause the

                                        5




                            CABLE TV FUND 12-B, LTD.
                            ------------------------
                             (A Limited Partnership)

               NOTES TO CONDENSED FINANCIAL STATEMENTS - CONCLUDED
               ---------------------------------------------------
                                   (Unaudited)

Partnership  to  distribute,  pursuant  to the  distribution  provisions  of the
Limited Partnership  Agreement of the Partnership,  the proceeds received by the
Partnership from the settlement.

         If and when the settlement is finally  approved,  the Partnership  will
then be  dissolved,  although  no  assurance  can be  given  regarding  when the
dissolution will take place.

         All amounts to be paid as a result of the  settlement  described  above
are the responsibility of the General Partner.




                                        6





                            CABLE TV FUND 12-B, LTD.
                            -------------------------
                             (A Limited Partnership)

         MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
         ---------------------------------------------------------------
                              RESULTS OF OPERATIONS
                              ---------------------


FINANCIAL CONDITION
- -------------------

         The only  asset of the  Partnership  at March 31,  2004 was its cash on
hand.  In  July  2003,  the  Partnership  transferred  substantially  all of its
remaining  cash to the  General  Partner as a  reimbursement  for the  allocated
administrative   expenses  described  in  Note  2  to  our  condensed  financial
statements.  The Partnership will no longer  reimburse the General Partner,  and
these  administrative  expenses  will  be  paid  by  the  General  Partner.  The
Partnership  has continued in existence  because of pending  litigation to which
the  Partnership is a party,  as described in Note 3 to our condensed  financial
statements.

RESULTS OF OPERATIONS
- ---------------------

         Administrative   expenses  and  other  in  the  accompanying  condensed
statement  of  operations   represents   various  costs   associated   with  the
administration of the Partnership.

Item 4.  Controls and Procedures

         Our chief executive officer and our co-chief financial officers,  after
evaluating  the  effectiveness  of our  disclosure  controls and  procedures (as
defined in the Securities  Exchange Act of 1934 Rules  13a-15(e) or 15d-15(e) as
of the end of the period covered by this quarterly report, have concluded, based
on the evaluation of these controls and procedures  required by paragraph (b) of
Exchange Act Rules 13a-15 or 15d-15, that our disclosure controls and procedures
were  adequate and designed to ensure that material  information  relating to us
and our consolidated  subsidiaries  would be made known to them by others within
those entities.

         Changes in internal  control over  financial  reporting.  There were no
changes  in  our  internal  control  over  financial  reporting   identified  in
connection  with the evaluation  required by paragraph (d) of Exchange Act Rules
13a-15  or  15d-15  that  occurred  during  our last  fiscal  quarter  that have
materially affected, or are reasonably likely to materially affect, our internal
control over financial reporting.

                           Part II - OTHER INFORMATION

Item 1.  Legal Proceedings

         Refer to Note 3 to our condensed financial  statements included in this
Quarterly Report on Form 10-Q for a discussion of recent developments related to
our legal proceedings.

Item 6.  Exhibits and Reports on Form 8-K.

         a)   Exhibits

               31   Certifications  of  Chief  Executive  Officer  and  Co-Chief
                    Financial   Officers   pursuant   to  Section   302  of  the
                    Sarbanes-Oxley Act of 2002.

               32   Certification  of  Chief  Executive   Officer  and  Co-Chief
                    Financial   Officers   pursuant   to  Section   906  of  the
                    Sarbanes-Oxley Act of 2002.

         b) Reports on Form 8-K

                None.


                                        7




                                   SIGNATURES


         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.


                                     CABLE TV FUND 12-B, LTD.


                                     BY:   COMCAST CABLE COMMUNICATIONS, INC.
                                           -----------------------------------
                                           General Partner


                                     By:   /s/ Lawrence J. Salva
                                           -----------------------------------
                                           Lawrence J. Salva
                                           Senior Vice President
                                           (Principal Accounting Officer)


Dated: May 12, 2004


                                        8