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Title: Eico 730 Modulator Post by: k5ygc on November 03, 2021, 06:31:10 AM Has anyone found a replacement OPT for the modulator? Or would it be best to have it rewound? Thanks Mark K5YGC Email is kc5ygc1@gmail.com
Title: Re: Eico 730 Modulator Post by: W3GMS on November 03, 2021, 10:09:30 AM You may want to consider a modulation transformer from a Johnson Ranger. Another choice, but not sure if it would fit in would be an ART-13 mod transformer, but based on what you modulating, make sure the turns radio is good.
Joe-W3GMS Title: Re: Eico 730 Modulator Post by: DMOD on November 03, 2021, 04:34:42 PM Has anyone found a replacement OPT for the modulator? Or would it be best to have it rewound? Thanks Mark K5YGC Email is kc5ygc1@gmail.com If we are discussing plate modulation the modulation or OutPut transformer should require this: The Impedance ratio is ~ 2.2:1 (Primary to secondary), so the turns ratio should be ~ 1.5:1, (Primary to secondary). Phil - AC0OB Title: Re: Eico 730 Modulator Post by: K9MB on November 03, 2021, 06:44:54 PM A Stancor A3893 might work. Here is the data on footprint. AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
If it will fit on the chassis, it is rated at 60 watts, so will easily handle the pair of EL34s. I may have a used one. If you want me to check, please email me. Good at qrz |