CHANDLER EVANS SUPER RARE AVIATION DEHYDRATION / SPARK PLUG BOAT AIRPLANE GLASS

[udaykalburgi]

Greetings !
I recently got a small equipment with glass tube, with Valve 6SJ7 and tuning arrangement. I did some search on internet and found the link to the glass piece. - on worthpoint. It is Aviation Dehydration Plug, CHANDLER EVANS SUPER RARE AVIATION DEHYDRATION / SPARK PLUG BOAT AIRPLANE GLASS ,Shaped like and the size/weight of a spark plug. Glass top and what looks to be copper or brass base. It says sure rare, my question why the 6SJ7 valve and the tuning arrangements? Is it to create some high freq to clean the silica gel inside the glass tube?
Any one can please help me to understand this part? could be of some avionics electronics?
Namaste !
Uday K
Bangalore, INDIA

 

[FLYBOYJ]

The dehydration plug is being sold on e bay for $35. The unit is some type of tuner.

 

[special ed]

As my father in law used to say, when looking at a device he didn't understand, "It sure is a nice one."

 

[Wurger]

IMHO the dehydration plug doesn't seem to be the part of the electric system of the unit. It looks like a kind of indication and protection against the moisture that could affect the work of the unit, especially if the device was for a boat. Contrary to that the 6SJ7 tube seems to be the electronic part of the device. Being the vacum pentode it may be a kind of a preamplifier for a tuning or regulating
section.

 

[pbehn]

Used to absorb moisture while engines are stored. What are dehydrator-plugs? | Light Aircraft DB & Sales plugs are used to prevent corrosion inside,be reactivated by heating the the silica gel.

 

[udaykalburgi]

Thank you all for the information !!

Uday K

 

[GrauGeist]

Doesn't appear to be a tuner but instead looks to be a form of voltage adjusted power supply.
Note the rheostat (slider on the coil) and the air-gap capacitor.

 

[udaykalburgi]

Thank you for all your replies. I found it is Collins Permeability Tuned Oscillators Model 70E8A. The Chandler Evans Aviation Dehydration Plug is used to keep away moisture. It is to ensure correct capacitance value.

Regards

Uday K

 

[MiTasol]

Congratulations on solving the puzzle. The CECO dehydrator would definitely be purely to warn of moisture - the silica gel changes colour with humidity. CECO was one of many companies to make such plugs. Their main line of business was fuel controls and components.