GDOs


 


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I have 62 different models of GDOs from 47 different manufacturers-not counting 7 homebrew units. I am looking for a nice Millen 90662-A; and...      anything else you don't see listed here!!!

FLASH: My Millen collection is now complete: I obtained Millen 90662-A SN:15 this week!!!

 

 

 

Take a look at my CORROSION TOPICS page. Lots of unfortunate mistakes and cures. Complete with closeups!!!

    

I collect GDOs, Wavemeters-and for some reason I'm not real sure of yet: BC-221s.. I guess I'm looking for the 'perfect wave'!

Grid Dip Oscillators (Meters) function by detecting resonance in a circuit-under-test. Essentially, they are calibrated variable oscillators. The plugged-in coil of the GDO, as a feedback element of the oscillator, determines the range of oscillation, and is coupled to the coil of the circuit-under-test. When the GDO is tuned to the same frequency as the circuit-under-test, the current of the GDO is reduced, and this "dip" in the GDO's current is shown on its meter.

Originally a tube-type oscillator, the absorption of the feedback signal to the tube's grid reduced the overall current drawn by the oscillator, and hence the name: Grid Dip Oscillator.

Another great reference to GDO operation can be found at Harry's Homebrew Pages:   

Also I have a few Wavemeters-including a very nice Millen.

Anyway... here's the GDO / Wavemeter list:

 GDOs & Wavemeters
ALCO Ambit Internatnl.*4 AMTRON B&W Boonton
CirKit*4 BUD *1 DeVine DL3QR EDDYSTONE
EICO ELDICO GLOBAL GRUNDIG HEATH
JAPAN. INDUS. KENWOOD*2 KNIGHT KYORITSU LAFAYETTE
LEADER LOADSTAR LOWE LYSCO McGRAW-EDISON *3
MEASUREMENTS *3 MFJ MIDLAND MILITARY MILLEN
MONARCH New London Instrument NOVEX PACO PEL Electronics
Quemont Q-Max RADIOMETER- COPENHAGEN RFT SAVANT
  TECH TESLA THORO-TEST TRIO *2 TRIPLETT *1
WATERS        

*(1) Wavemeters *(2) TRIO ~ Kenwood *(3) McGraw-Edison bought Measurements for the production of the '159. *(4) Ambit & Cirkit are both designs by G3WPO. The Cirkit is a (later) MkII version.

The NEXT page discusses what a GDO is, and how they operate.

 



 

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