N4MW Code Practice Oscillator Museum

Return to Home

Return to Projects

 Return to CPO

Return to N4MW
Tube Style Code Practice Oscillators
Instructions:   Allow time to load.  Hover cursor over picture for text description. Click picture to enlarge.
T. R. (Ted) McElroy family (Telegraph Apparatus Company)

Comments received from Ted's nephew, Howard.

Telegraph Apparatus Co. NOT INC (Ted McElroy) code practice oscillator Telegraph Apparatus Co. NOT INC (Ted McElroy) code practice oscillator with built-in key TAC unit.   Nothing else known.  This one has acquired a nice "patina".   Note the old AC plug and the woven fabric key cable. TAC (Telegraph Apparatus Corp.) oscillator with integrated ke

T. R. McElroy's Audio Oscillator T. R. McElroy Oscillotone Telegraph Apparatus Co. (Ted McElroy) code practice oscillator - 117N7GT in metal box McElroy Radio Telegraph Apparatus code oscillator
AMECO family

AMECO, tube, (hammertone gray).  These units seem to pop up often at hamfests.   Miniature tubes are used.  AMECO Code Practice Oscillator (pre CPS?) AMECO CPS, "An AMECO Product", tube, (black box) AMECO CPS, "An Aerotron Product", tube, (black box)
ICA family

Insuline Corp of America, "SIGNA TONE" clasroom model No. 4301 ICA "DE LUXE SIGNA TONE" model No. 4300 ICA "DE LUXE SIGNA TONE" model No. 4300 (variant)
Bud family

Bud Codemaster CPO-130A (without speaker) with Trimm Featherweight headphones Bud Codemaster (red letters, without speaker) Bud CP-128-B Codemaster BUD CODEMASTER,tube, (gray w/red marking) BUD CODEMASTER (tall, white letter, speaker grille insert) BUD "Audio Oscillator", octal tube, used with headphones.  I also have a similar unit in an elongated enclosure which contains a speaker. Bud Codemaster, tube, gray w/red marking, horizontal, w/speaker Bud Codemaster, square box cabinet style Bud (red letters, grille variant) Bud (black crinkle, without speaker)
Uniques

Smith Code Practice Oscillator and Monitor Gonset "Oscillator Monitor", tube Gonset "Oscillator Monitor", tube (white finish) Codemaster Model K, wood box with built-in plunger key Johnson Signal Sentry Midland Television Multi-Vibrator Oscillator Phillips Code Oscillator Knightkit Star Roamer JCT Audio-coder model SP (?) Eagle Code Practice Oscillator kit (1948) Magna Electronics unknown model code practice oscillator Maxfield Electronics Corp Audio and Code Oscillator Creative Educational Society Mankato, Minnesota
Return to Home

Return to Projects

 Return to CPO

Return to N4MW