One of the subjects being considered as part of the rewriting of the Communications Act of 1934 is radio-frequency interference (RFI) of which CB radio has become the major source. Reportedly there is a danger here that the responsibility for such interference may be placed on the equipment being interfered with, so that the victims instead of the causes would be penalized. The "RFI-proofing" of certain classes of stereo and hi-fi equipment could actually degrade their performance while also probably causing yet another rise in their prices. Both the hi-fi industry and consumers of hi-fi gear would thus bear the burden of a situation not of their making.

If you feel this is the wrong way to solve the problem, let them hear from you. Sen. Ernest F. Hollings (D-S.C.) is chairman of the Senate Subcommittee of Communications of the Commerce Committee.

Some recent queries:

Q: On a recorder with a variable bias knob, is there any way to verify correct bias without resorting to meters and special test equipment?

A: One method suggested is to tape-record some of the "white nosie" you hear between FM stations (with the muting switch off, of course). If you have a three-head recorder, use the monitor switch to compare the noise from the FM receiver with the taped results. If you own a two-head recorder, run the tape for several minutes, rewind, and start playback. Compare this sound with the FM receiver's sound by switching between tape and FM on the master selector.

If the recorded sound lacks all of the high-frequency energy of the original FM-noise sound, reduce the setting of the bias control. If the recorded noise has more high-frequency content than the original FM noise, turn the bias control clockwise.

Remember that if you change to another kind of tape, you really should check for correct bias again.

Q: I am confused by recent mention of different "classes" of amplifier. Can you clarify?

A: Briefly, the new "class of operation" labels for amplifiers have to do with their more efficient use of operating power so that higher wattage output can be obtained for relatively less drain on the AC power line. That these new amplifiers also sound very good is due more to basic circuit design than to the "class of operation" as such.

Q: What is you view of the new metal-particle tapes?

A: Initial tests of a metal-tape casette show that, vis-a-vis other tapes, it has a little better response and notably better dynamic range in the extreme highs and slightly better signal-to-noise ratio in general. However, it also has a little higher distortion. On balance, so far, it seems "somewhat better" than former tapes but its advantages might concern the "semi pro" rather than the average home user, especially since it costs twice (or more) than what "standard" low-noise tape cost.