...The radios we'll always remember


 Posted By: Robert Nickels (W9RAN)
Posted: 03/01/2022

Fone Forum 0 Comments 03/01/2022 

Elmac Mods

Collection of ideas FYI


The various Multi Elmac Rigs have been the subject of various modifications.  Whether to include them or not is obviously up to the owner, we just include some here as a reference.

One common problem is the failure of the modulator interstage coupling transformer.  Fortunately a brand-new replacement is available at low-cost, search for sellers of Hammond P-T156, “Equivalent to Stancor A53-C. 1:3 ratio overall. Center tapped secondary may be used for push-pull grids.Specifications Max. Primary Current: 10 mA Impedance Primary to Secondary (Ohms): 10,000 to 90,000”   Under $20.

Also many solutions have been used to replace the bias battery, including new batteries ;-)  But a permanent fix can simply be implemented by inserting a 22 volt 5 watt zener diode in the cathode lead, bypassed with a 10-50uF electrolytic to create self-bias.   No loss of modulation and no battery to replace.

W7ZFB has compiled a list of suggested mods - see the link below.

Mike N9BOR has a great accumulation of Multi-Elmac resources on his website   Just click the Boatanchors tab and select the item of interest, including the W7ZFB notes and more.

 


Description Comment  
Notes on mods to the AF-67

   

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