The four never-procured vacuum-tubes indicates that the still-born WTB was likely intended to be constructed as a 100-watt station, with two of the 50-watt tubes used as modulators, and the other two for the signal transmission. Nor was any "regular licence" ever issued.
 
Evansville (Indiana) Courier, March 7, 1922, page 1:

LUHRING  WORKS  FOR  PONSELLE  RADIO  CONCERT
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Dept.  of  Commerce  Requested  to  OK  Special  License--Shriners  Ask  Attendance

    WASHINGTON, March 6.--(Special)--At the instance of Sec. J. S. Johnson for the Chamber of Commerce, and The Courier, in behalf of the Civic Music Commission, Representative O. R. Luhring, of Evansville, has applied to the department of commerce for special license for Thomas Drury, of the Sieffert Electric company to broadcast by radio the voice of Miss Rosa Ponselle, Metropolitan opera and Columbia record prima donna soprano, Thursday, March 16.
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    Rosa Ponselle will sing Thursday night for The Courier radio concert if the special permission, in advance of the regular license which will be issued within the month, is approved.
    The Civic Music Commission has secured Miss Ponselle for March 17, at the high school auditorium, for a popular recital, at prices less than Miss Ponselle has sung for within the past three years en tour.
    Many civic organizations have promised support to the recital, and Columbia records by Miss Ponselle will be heard in all public schools.
    The Hadi Shrine has asked that Miss Ponselle appear in person before the business meeting the night of March 16, and telephonic communication with New York assured that she will attend.
    Seats may be reserved at the office of the Chamber of Commerce, and mail reservations will be accepted and filled in the order of their receipt.
    Prices for the recital will be $2, $1.50, and $1. There is no war tax added, as the Civic Music Commission is not organized for profit.
March 10, 1922, page 1:

Federal  O.  K.  On  Concert  by  Rosa  Ponselle
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Department  of  Commerce  Assures  Permit  for  March  16--Seats  on  Sale  Saturday--Seek  Powerful  Equipment

    Permission from the Department of Commerce was assured the Sieffert Electric company to broadcast Miss Rosa Ponselle's voice, Thursday, March 16, in a message received yesterday by Sec. J. S. Johnson, of the Civic Music commission.
    Receipt of four 50 watt vacuum tubes, ordered for the radio outfit, is awaited, as the otherwise complete set would not be in position to do justice to the great star's voice.
    Thomas Drury, radio expert, leaves this morning for Chicago, and other cities if necessary, in search for this equipment.
    Tickets for the recital Friday at the high school auditorium, of the great Metropolitan opera company and Columbia record artist, will be ready Saturday.
    Advance sales and mail reservations are coming into the office of Secretary Johnson at the Chamber of Commerce in encouraging volume.
    The tickets, in the commission's endeavor to give the "best of music at popular prices," will be on sale at Columbia dealers next week, and Thursday and Friday at the Central high school.
    Plats of the house will be on display in each agency, so that selection may be made easily. There will be no duplication of tickets.
    The Courier invites suggestions from radio phone owners for selections from Miss Ponselle's repetory for the radio concert Thursday night, dependent, of course, on success in getting the powerful tubes.
    Miss Ponselle will most likely bring the same accompanist this year as in 1920.
    Seats are selling at $1, $1.50 and $2. There is no war tax charged.
March 11, 1922, page 1:

SEEKS  TO  HAVE  COURIER  RADIO  RECITAL  FILMED
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Music  Commission  Starts  Action  Today--K.  C.  Star  Follows  Evansville's  Lead

    The Civic Music Commission will communicate today with representatives of national film weeklies, with a view toward getting cameramen here to "snap" Rosa Ponselle singing her first radio concert, March 16, provided The Courier radiophones four 50-watt vacuum tubes have been rounded up. Frank Sieffert, of the Sieffert Electric company, left this morning on a still hunt through the central west for tubes of this magnitude.
    The Kansas City Star will broadcast her voice on her appearance in Kansas City, March 20, and she will likewise give a radiophone concert from New York for the Caruso Memorial.
    Miss Ponselle has advanced her date of arrival to Wednesday night, as she will not sing the same day she arrives in any city. She will appear in concert March 17 at Central High School auditorium.
    Contrary to a statement in an afternoon paper, the Chamber of Commerce has no connection with the radiophone broadcasting of Miss Ponselle's singing. The Courier's own radiophone station will be used and the Civic Music commission made all arrangements for the concert.
    Sec. J. S. Johnson, in communicating with Rep. Luhring for federal O. K. on The Courier's radio concert, was acting for the Civic Music commission.
    This morning seats will go on sale in four Colombia agencies in Evansville, Finke's 37 steps from Main, Fourth street Finke, The Handy Furniture company, Main street, and the Koch Outfitting company, Third avenue and Pennsylvania street.
    All these stores will have special windows for Ponselle, and The Courier will devote its Main street window to Ponselle and Columbia products.
    Last night Rabbi Israel, of the Washington avenue temple, announced that temple, March 17, will be over in time for the congregation to attend Miss Ponselle's recital.
    Prices for the recital are $2, $1.50 and $1, with no war tax.
March 16, 1922, page 4:

PONSELLE  PARTY  IS  IN  CITY  NOW
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Great  Singer  Arrived  Last  Night--Wireless  Concert  Has  Been  Cancelled

    Rosa Ponselle, Columbia and Metropolitan opera company star, arrived in the city last night at 8:45 with her accompanist, Mr. Ross, and Miss Prilip, her secretary, for her concert Friday night at the High School Auditorium, under the auspices of the Civic Music commission.
    Miss Ponselle's radio concert cannot be held, because it has been found impossible to buy or borrow 50 watt vacuum tubes in the entire United States. The country was combed by The Courier and the Sieffert Electric company, in an effort to locate these indispensable accessories.
    Miss Ponselle was met by a Marmon sedan, loaned by the Tri-State Motors corporation, and a Marmon limousine, one of the finest cars in the city, will be at her disposal to day and tomorrow, through the courtesy of the same firm.
    The Kiwanis club will be introduced to Miss Ponselle at noon luncheon at the McCurdy today.
    Miss Ponselle will sing Friday at less prices than for over three years, $2, $1.50 and $1, no war tax.
    Seats are on sale at the National City Bank, Third and Main streets.