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Hickok & Military Tube Tester Fuse Lamps

   number's 49 - 64 - 81 - 82
 

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Hickok tube testers have used lamps in their tube testers since their first model introduced in the 1920's. It is very important to use the correct lamp number/s in your tube tester to insure the intended circuit protection (fuses) and correct test readings. These tube testers are not laboratory instruments and offer no voltage regulation. Using incorrect lamps and a Solid State replacement rectifier will alter the Mutual Conductance readings.

Here's why; (1) -read why the solid state rectifier in your Hickok may not a good idea. (2) the lamp used for the main circuit protection fuse is in the power transformer primary. If the lamp draws too little or too much current, the meter  reading will vary accordingly. Not only that but if the lamp's current draw is too high, power transformer protection is reduced (it's like using a larger fuse). (3) the #49 lamp is used in the bias circuit on some models to protect the bias adjustment potentiometer. It's most important not to use any other number lamp as it only takes a moment to fry the bias pot if the tube under test is shorted.

Some of these lamps are becoming hard to find so I now offering as NOS or NS the following lamps that are correct for both post-war and pre-war Hickok Tube testers and those using the Hickok circuits; which are most of the Military models.

Ordering & Shipping Info > PLEASE READ < BEFORE ORDERING!


#49 Bias control fuse in many post-war models, very important

#61 very hard to find. Power fuse in early models

#64 Power fuse in some pre-war models
 

#81 Power fuse in most post-war models
 

#82 Power fuse in some pre-war models
 
2 for $7.95 + Shipping
$7.95 each + Shipping
2 for $9.95 + Shipping
2 for $10.95 + Shipping
2 for $9.95 + Shipping

< Instruction manuals and tube test set-up charts available for  most model Hickoks & other brands

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