The problem will be that the grado is terminated in a 1/4" phone plug or a 1/8" mini plug. The outputs on the Heathkit are likely to be speaker outs, they way you have described them. You will need an adapter. ASL sells one and I am sure there are others. It won't hurt the headphones and it will probably be best on the 16 ohm tap, but you can experiment.
7 watt tube amp as headphone amp?
I have a Heathkit A-7 I'm thinking I'd like to use as a headphone amp if possible. It has 7 watts output and 4, 8, 16 ohm connections. Grado's lower-end headphones are 32 ohms. Will connecting 32 ohm headphones to the 16 ohm output be "bad" for the amp? Do I need to keep the volume extremely low so I don't blow the headphones? Is this a generally bad idea?
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