[Ron Ramirez]

Very interesting. (where's Arte Johnson now when I don't need him...)

Of the receivers I have so far (Fisher 170, Fisher 220-T, Harman Kardon SR600, Marantz 2215B, Toshiba SA-735), the Harman Kardon SR600 is the only one that *might* need something. I'll know more when I get around to digging into it. It uses Ge transistors, being one of H-K's first all-transistor receivers (1964). The Fisher 220-T and Marantz 2215B work well; the Fisher 170 tries to work but has distortion in the left channel; and the Toshiba is dead. I'm almost positive the 170 is new enough to use silicon (1973), and I'm sure the Toshiba is also (it's from 1978-1980).