I haven't found a cross reference for the H1061. I do know that the transistor is NPN 50V / 3Amp / 25Watt. Given this, you may be able to search for a suitable replacement which matches the same values.
I've looked at NTE, National Semiconductor, Digikey, Mouser and none of them list this as a current part, or cross reference a replacement.
There are some circuits with h1061 on Google.com. Just type in H1061 transistor. Maybe this can give you a lead. Sorry I can't help with more. Good luck!