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Obsolete Features on Audio Equipment

KentTeffeteller said:
Reverse Stereo is useful. It is for correcting out of phase sources.
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My Citation has a phasing and a stereo reverse switch.
It has other obsolete features such as Turnover, Rolloff, Blend, Contour and Low-Cut [Subsonic,Rumble] filters.

The Turnover and Rolloff filters are ideal for record playback. :yes:
 
Surprised nobody mentioned "Phase Reverse" switch yet.

That's completely different from "Stereo Reverse".
 
I for one, wish stereo reverse never went away: Very helpful for diagnostic purposes.

If you have a tape monitor loop that's not doing anything, you can make your own "stereo reverse" switch. Just run a pair of ICs - crisscrossing the L/R from REC to PLAY.
 
gadget73 said:
phase reverse switches. These invert phase on one speaker only to compensate for inverted phase on AM/FM simulcast broadcasts.
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62caddy said:
Surprised nobody mentioned "Phase Reverse" switch yet.
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:)

My Sherwood does it in an overly complex way too. Most of them flipped the polarity between output transformer and the speaker terminals. The Sherwood actually switches output from the tone amp into the voltage amp from an anode follower (inverse phase) to a cathode follower (non-inverting) so the entire audio amp sees the signal with opposite phase. Oddly, if you use the tape monitor input, it bypasses that entirely.
 
gadget73 said:
:)

Quote:
Originally Posted by gadget73
phase reverse switches. These invert phase on one speaker only to compensate for inverted phase on AM/FM simulcast broadcasts.

Quote:
Originally Posted by 62caddy
Surprised nobody mentioned "Phase Reverse" switch


My Sherwood does it in an overly complex way too. Most of them flipped the polarity between output transformer and the speaker terminals. The Sherwood actually switches output from the tone amp into the voltage amp from an anode follower (inverse phase) to a cathode follower (non-inverting) so the entire audio amp sees the signal with opposite phase. Oddly, if you use the tape monitor input, it bypasses that entirely.
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Must've missed that - that's what happens when you skim through posts when you're late to the table...:o

Curiously a tuner preamp that I have also has Phase Reverse. I guess phase can be reversed at the line level too - would never have guessed.

One more - does "Magic Eye" for tuning count?
 
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kward kward,

"I have a Realistic receiver that I bought new in 1978 with Quatravox":

having looked at a QV box on ebay, i see it is really a dynaquad circuit of sorts executed at line level. it would require two more channels of amplification to drive the rear speakers.

it is a valid matrix circuit that could be used today instead of 4.1 (i use the speaker level Dynaquad with great success on all sources). it is the circuit that dolby pro logic is based upon.
 
The tape head inputs (as Gadget mentioned) along with the speed equalization switching found on the Pioneer TX-1000TW receiver. I'm surprised this receiver has them since it's from a later era (late 60's early 70's) when pretty much all machines had their own preamps. You could actually switch the selector on the receiver from 7 1/2 ips to 3 3/4 ips equalization for the tape head input - lots of extra work for something that probably never got used by that point in time.

Ceramic phono inputs are another one I don't see much use for.
 
i have a sangean tuner with HD Radio which allows me to pick up kcrew-2 which i otherwise listen to online at :

http://www.kcrw.com/music/eclectic24

this station plays EVERYTHING though mostly newer and indie music. it's where i first heard the black keys, franz ferdinand plus they don't play the same song in the same hour and many times for hours.

it is interesting to explore at times and this gives me many options.
 
If you're a Jazz fan and live in the Delaware Valley there is WRTI from Temple University. It's easy to hear that the over the air signal is better than anything streamed off the Internet. In addition Drexel and the Univ. of PA both have excellent sounding stations with an eclectic mix of all kinds of music. My Accuphase tuner does them justice.
 
ElPee said:
The "Reverse Stereo" setting on my old Crown C-150A Pre-amp was a fairly cool feature that is now very obsolete.
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Not obsolete, just not often used. I have a few preamps with reverse, or phase inversion switches (used to have an IC-150a, years ago too), and on some recordings they help. I find it very annoying to hear the instruments of an orchestra to be flipped from one side to the other. As a matter of fact, both my Audio Research SP-9 MrkII, and Spectral DMC-6 in my signature have this feature, and it does get used with some regularity.

Now, AM stereo, and quad FM tuners... those ARE obsolete. :D
 
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Tone control/Variable Loudness can be useful.

These features are there because manufactures don't know what kind of speakers and/or room size/environment we have.

What about a 12-band stereo equalizer, then? :scratch2:
 
JoeESP9,

i do realize that off-air play sounds better than online streaming but some otherwise unavailable stations can be heard for their great offerings of widely varied musical tastes.
 
Karl vd Berg said:
Tone control/Variable Loudness can be useful.

These features are there because manufactures don't know what kind of speakers and/or room size/environment we have.

What about a 12-band stereo equalizer, then? :scratch2:
Click to expand...

Forgot to mention 3 more things:

. the medium used to listen to the music (TT, cassete decks, CD players, etc)
.. the nearly infinite kind of music the amp buyer will listen to (Jazz, Rock, Classical, Pop, etc)
... there is always a flat position for the knobs

:thmbsp:
 
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