Strangely, a long time ago ( 80's ?) SANYO made a tuner that had a 20dB signal strength reduction switch >
I guess they thought some people lived next to a transmitter
There are various distortion mechanisms in tuners:
-demodulator non linearity. solutions coax delay line, higher order filter in multiplying detector or count detector plus deviation tripler
-IF filter group delay linearity. toko had crystal wide IF filters with excellent group delay. too expensive also for high end tuners.. ( I still have a pair)
- multipath reception , solution yagi directional antenna on rotor
-demodulator non linearity. solutions coax delay line, higher order filter in multiplying detector or count detector plus deviation tripler
-IF filter group delay linearity. toko had crystal wide IF filters with excellent group delay. too expensive also for high end tuners.. ( I still have a pair)
- multipath reception , solution yagi directional antenna on rotor
The Sony ST-SB920 also stores the antenna input, attenuator, IF narrow/wide and mono/stereo settings for each preset (after you switch off the routine that automatically selects the wrong settings, but you only need to do that once). As a volunteer at a local radio station, features I particularly like are the fact that it can display the RDS PI code (which is actually not meant for the listeners, but for the RDS firmware) and the signal strength indicator with 1 dB resolution.
OK, so I got something today... the Phase Linear 1000. The seller claimed it was a estate sale and it looks like it. It looks like it was stored, indoors, in its box for decades. It powered up but I got no signal... after playing with it a little and reading the manuals ( user's and repair ) it dawned on me the front switches were likely the culprit. So after cycling through 300+ times, I got music through but not quite reliably through the processing circuits... so tomorrow I'd use deoxit.
I paid about 125 all inclusive in eBay. The seller is not an "audio" seller but handles states, so he seemed honest... and he was.
Now then, a dbx 118 is coming in tomorrow from @Dave R for shipping and beer money. THANKS. Next time I go to the PNW I might have to see if I can show up at their Audio Group... bring the Bose "stereo nowhere" hat.
So now, looking at the RG models.. I guess the Pioneers and RG are the same... after the first gen. So, I'll look for one of them.
Here's the porno...
I paid about 125 all inclusive in eBay. The seller is not an "audio" seller but handles states, so he seemed honest... and he was.
Now then, a dbx 118 is coming in tomorrow from @Dave R for shipping and beer money. THANKS. Next time I go to the PNW I might have to see if I can show up at their Audio Group... bring the Bose "stereo nowhere" hat.
So now, looking at the RG models.. I guess the Pioneers and RG are the same... after the first gen. So, I'll look for one of them.
Here's the porno...
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Stumbled upon a bunch of info on your new box; https://www.kenrockwell.com/audio/phase-linear/autocorrelator.htm
There's a link in there about restoring / modifying it. Worth a look IMHO
There's a link in there about restoring / modifying it. Worth a look IMHO
How nostalgic for me seeing those photo's > I have a Phase Linear 2000 Pre-amp in storage. It was my system pre-amp for years.
Interestingly, those black-push button switches started giving me trouble as well. (poor manufacture/design)
Definitely a job for Deoxit. I didn't have that back then and WD-40 didn't work 100% totally perfect.
PS.
I truly believe you will get the best results using the RG/Pioneer processors
Awesome info folks. I hooked it up to the EPL ( tape ) loop of my preamp using good quality Audioquest interconnects.
After lots of using the pushbutton switches ( I was up at midnight having a rum nightcap and pushing those darn things ).... the tape/source works well, the autocorrelator is a bit noisy but it works, the expander only outputs something from the right speaker and at a lower level.
It's likely that the switches are working but there's an issue with the circuit... who knows at this point. It's just the beginning.
Yes, recapping it is in the works.
And yes, I'm looing into the RG units as well.
After lots of using the pushbutton switches ( I was up at midnight having a rum nightcap and pushing those darn things ).... the tape/source works well, the autocorrelator is a bit noisy but it works, the expander only outputs something from the right speaker and at a lower level.
It's likely that the switches are working but there's an issue with the circuit... who knows at this point. It's just the beginning.
Yes, recapping it is in the works.
And yes, I'm looing into the RG units as well.
And the beat goes on.... I got a hold of my 70's expert, he will work on them... worth every penny. I want them fully rebuilt and I'm not about to mess with the interior of these babies....
Thanks to our fearless Viking in the PNW.... A big Uffda to @Dave R
With a manual no less...
You know, it's funny, the juxtaposition of eras.. I got the Burson DAC just to the right of these units and a Chromebook just off...
Thanks to our fearless Viking in the PNW.... A big Uffda to @Dave R
With a manual no less...
You know, it's funny, the juxtaposition of eras.. I got the Burson DAC just to the right of these units and a Chromebook just off...
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Offtopic:
when searching and listening to the digital versions of this song I found about four different releases (from the same performer), each of them mastered and sounding different...
I already did notice how the Phase Linear autocorrelator works. It does both treble and bass. To "calibrate" it you need a source with both treble and bass controls, which I don't have in my preamp...
It operates to cut off rumble (bass cut) and high frequency noise.
So what I did was to turn the bass calibrator to take it out of the way... I don't have an issue with any of that, and then I use the big control to set up the treble cut.
So far I think it's pretty subtle... this is because my system already has a very low noise level... I need to play more with it.
It operates to cut off rumble (bass cut) and high frequency noise.
So what I did was to turn the bass calibrator to take it out of the way... I don't have an issue with any of that, and then I use the big control to set up the treble cut.
So far I think it's pretty subtle... this is because my system already has a very low noise level... I need to play more with it.