[HomeBrew] Need help with AM BCST hb tube radio

[n6kyr at netzero.net]

All:
-Just wanted to change a few things on an AM tube radio I'd like to build up. I am going to use a DDS VFO circuit to act as the oscillator to change the freq of the radio. 

-The way I'd like to do this is to inject the DDS output into the first RF amp/mixer. Can I do this at the cathode if I use a tranformer to do this? The approximate Z of the DDS VFO is 2.5 kohms. Also, how much signal should be used (i.e. what is the ratio of the input signal to the DDS VFO output)? 

-Where can I get a source for tube style IF cans (at 455 kc, of course). 

-Would it be possible to use this same circuit (if I changed the DDS VFO freq output) to cover 160 meters? I'd like to use the radio for both. 

Let me know and thanks! Cal. N6KYR. 

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