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Royal Mfg. Co.

Royal Manufacturing Company, World Building, New York, New York, USA {Sep 1923}
Royal Manufacturing Company, 296  Broadway, New York, New York, USA {Mar 1924}

d/b/a Strong-tone Tube Company, 208 Broadway, New York, New York, USA {Sep 1924}
d/b/a Barfield Electrical Laboratories, 206 Broadway, New York, New York, USA {Sep 1924}
d/b/a Chisholm-Barfield Corporation, 206 Broadway, New York, New York, USA {Apr 1925}


First seen: 01-Jan-1924
Last seen: 31-Dec-1924

Brand(s): Harp, Powertone, Royaltron, Strongtone, Radio Knight

insert text here
Harp variants:
 
H
A
R
P
200-DA
1
Tube
{v1} Moorhead style?, brass base, tipped


Harp tubes are a rare early tube. Having never seen an example it's difficult to tell if it in anyway matches the images.

 


Powertone variants:
 
P T
O O
W N
E E
R
201-A
1
Tube
{v1} Globe, brass base, tipped


Though at first, Barfield Electrical Labs appears it's own mfg & brand. 20-Sep-1924 is their only known ad. 

They are found at 206 Broadway, New York

 


Royaltron variants:
 
R T
O R
Y O
A N
L
201-A
1
Tube
{v1} Globe, brass base, tipped


insert text here 

 


Strong-Tone variants:
 
H
A
R
P
201-A
1
Tube
{v1} Globe, short bakelite base, tipped


Only advertised Sep-Oct 1924, Strong Tone Tube Co. was at 208 Broadway, New York.


Radio Knight variants:
 

Advertised with the 'Radio Knight' receiver, we find another tube out of the Royal Mfg. effort. Using the 206 Broadway address, they are now listed as 'Chisholm-Barfield Corp.'




Bibliography references:
  1. Radio Retailing, Jun-1929, pg. 267. From AmericanRadioHistory.com. Retrieved 30-Nov-2018. !
  2. ..
  3. Radio News, Apr-1925, pg. 1961. From AmericanRadioHistory.com. Retrieved 16-May-2029

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