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> Amazing Results With 10.7 Mhz Ceramic Filter, Its toobed!
Scifi
Posted: October 18, 2014 06:10 pm
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I've been working on an Espey 200 tubed AM/FM receiver to get better reception for a couple years now. I've been using it with a Pilot 100 stereo demodulator, Fisher 500B amp, Altec Lansing horns for treble and back loaded horns for bass (with oxygen free copper cables and a silver cable between the receiver and stereo demodulator). I like it compared to a Dyna FM3. The Espey 200 seems to sound a little less distorted, I think because it has less selectivity compared to receivers with built in stereo demodulators, such as the FM3. A roof antenna was the first big improvement I tried, but I continued to get interference from an NPR station at 88.5 when listening to WMUC on 88.1 FM in stereo even after aligning and adjusting the Espey 200 and Pilot 100.
See http://antiquesci.50webs.com/WMUC.htm for details about the antenna.
I tried putting in some limiters as described here
http://antiquesci.50webs.com/Espey200.htm
and recently tried putting in a 10.7 MHz ceramic filter in the IF section and found that it greatly improved signal quality. I first wrote about it here
http://www.audiokarma.org/forums/showthread.php?t=619881


ceramic filter circuit I installed in the Espey 200
user posted image



link to Japanese patent (see drawings)
http://www.filedropper.com/jp1978004445a

link to Espey Schematic here
http://antiquesci.50webs.com/Espey200.htm

insights into silver wires (helps preserve phase in stereo composite signal)
http://www.quadraphonicquad.com/forums/sho...er-tonearm-wire
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Colt45
Posted: October 18, 2014 08:00 pm
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QUOTE (Scifi @ October 18, 2014 11:10 am)
insights into silver wires (helps preserve phase in stereo composite signal)
http://www.quadraphonicquad.com/forums/sho...er-tonearm-wire

lolwut


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Village Idiot
Posted: October 18, 2014 10:28 pm
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Oxygen deprivation does indeed have a profound effect on how a person perceives music (as well as other things).
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johansen
Posted: October 18, 2014 10:35 pm
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i dropped a bomb on a diy audio thread about hearing the difference between different kinds of batteries.

i said, anyone who can hear the difference between a low noise power supply and a battery should be able to hear a baby crying 2000 miles away.

i expected to get some flack for not taking into account the dampening coefficient for air,, or the curvature of the earth making such a test impossible.. but no... no direct comment .. except someone noting the difference in impedance was more important than the noise content of the supply in question.


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MacFromOK
Posted: October 19, 2014 12:14 am
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"Silver-Plating greatly improves high frequency performance for a fraction of the cost of solid silver."

I wonder how much hi-freq they can hear... mellow.gif


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CWB
Posted: October 19, 2014 03:05 pm
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ya know ...
the makers of high end turntables (of which i own four and not a radio shack special in the batch) did not use "silver wire" between the cartridge and rca connectors .
now , it seems to me that if Ag vs Cu made a real difference in the real world that they would have sprung for spending 50 cents more as a case for a "selling point" .

i believe that 99% of the "things" touted and sold in/on the modern "high end" audio forums are more designed to separate a person from their money rather than produce quantifiable (versus qualitative) improvements/results .

i have found that the "ceramic filters" of the proper design will indeed be an improvement over the old LC IF (etc) transformers .
however , impedance and drive level matching are important ... especially in those instances where the plate load is replaced by a resistor and dc blocked/coupled to the ceramic filter .


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jim currie
Posted: October 19, 2014 04:02 pm
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silver 1.59x10-8th power is ohmes per m. copper 1.68 x10-8th power. so how long is the pick up wire , moot point as CWB said.
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Scifi
Posted: October 19, 2014 04:34 pm
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QUOTE (johansen @ October 18, 2014 09:35 pm)
i dropped a bomb on a diy audio thread about hearing the difference between different kinds of batteries.

i said, anyone who can hear the difference between a low noise power supply and a battery should be able to hear a baby crying 2000 miles away.

i expected to get some flack for not taking into account the dampening coefficient for air,, or the curvature of the earth making such a test impossible.. but no... no direct comment .. except someone noting the difference in impedance was more important than the noise content of the supply in question.
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Jimthecopierwrench
Posted: October 20, 2014 08:43 am
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QUOTE
AM/FM receiver
Huh, I mean I can almost ... almost, like almost watch gay porn - get some of the audophoolishness when it comes to reproducing an owned recording or something, but broadcast?? I'm pretty sure 108 here generates their playlist from a PC plugged into the board (seriously, i can hear the windows "doink" sound sometimes - they don't even try to hide it). I figure if it does L+R my system is doing as much as it can wacko.gif .


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Nothing40
Posted: October 20, 2014 09:02 am
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I've heard the "Doink" too..Not only that,but then they compress the crap out of it,to make it LOUD.. and instead it sounds like shite.
I've got a good tuner,but there's no point anymore -nothing worth listening to.


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CWB
Posted: October 20, 2014 01:46 pm
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yeppers ...
hacked , cracked , stepped on , chopped and channeled .
there were only a few stations i/we engineered for over the years that actually gave a rat's patoot about the real quality of their audio .
and things have not improved .

as an example i visited a "local" station ...
i seen some very nice uW link equipment and some high-dollar audio processing stuff .
this kind of equipment : http://www.orban.com/products/

amazing , the station sounded like absolute s*** on the air about 1/2 the time .
armed with this information i noted that the audio went to hell just after the "morning show" (comprised of so-called local air talent) .
somewhere around 1600 the audio "straightened out" and was good for many hours and then went to hell again .

i figured it out ... there are multiple set-ups that can be programmed into the particular optimod that was in the rack .
the best programming in the world is worthless if the real time clock is not set correctly or the "program call" is wrong .
ya gotta be smarter than the equipment you intend to operate .


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Nothing40
Posted: October 21, 2014 12:02 am
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Orban OptiMod.. that mighta been their problem,right there. From what I gather most techs with an 'ear' hated those things.


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CWB
Posted: October 21, 2014 12:40 pm
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ehhh ...
you can set those to some very extreme parameters .
the problem was not the unit , it was either the tin ears of the engineer or GM .
many GMs were misguided by thinking that louder = better .

the digital units were/are prone to glitching and need to be re-booted from time to time .
(a relay driven from one of the telemetry channels works ok)

the old analog units were plagued with electrolytic caps heading south .
man , the hours i spent re-capping those things .



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Sch3mat1c
Posted: October 21, 2014 01:58 pm
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Sadly, time and time again, "louder" has been *proven* better, i.e. generates more listeners and for longer.

If people are dumb, might as well make a buck selling ads to them.

Tim


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Scifi
Posted: October 22, 2014 02:09 pm
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Skeith
Posted: October 23, 2014 03:02 am
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QUOTE (Nothing40 @ October 20, 2014 03:02 am)
I've heard the "Doink" too..Not only that,but then they compress the crap out of it,to make it LOUD.. and instead it sounds like shite.
I've got a good tuner,but there's no point anymore -nothing worth listening to.

yep. And even if there is a station that plays decent music or doesn't sound like turds, they have a set list of a whopping 20 track that they play over and over doh.gif

I switched to XM radio, and love it. Lots of variety, good music, commercial free, and most stations have quality better than FM, not quite CD, somewhere in between.
Though its not free, and with everyone and their dog paying for netflix and be not being a movie person, that is how I made my justification. And with the portable boombox plugged into my HiFi, I can listen to it at home, in the truck and by popping some batteries into the boombox, everywhere!.


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Nothing40
Posted: October 24, 2014 12:33 am
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QUOTE (Skeith @ October 22, 2014 07:02 pm)
QUOTE (Nothing40 @ October 20, 2014 03:02 am)
I've heard the "Doink" too..Not only that,but then they compress the crap out of it,to make it LOUD.. and instead it sounds like shite.
I've got a good tuner,but there's no point anymore -nothing worth listening to.

yep. And even if there is a station that plays decent music or doesn't sound like turds, they have a set list of a whopping 20 track that they play over and over doh.gif

^^ That is another major part of it. I don't want to hear Backstreet Boys 27 times a day,FFS.


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Scifi
Posted: October 26, 2014 12:54 pm
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Electric Candle 198 MB mp3 file October 4, 2014
http://www.filedropper.com/electriccandle15001800-oct4-2014 o
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Scifi
Posted: November 05, 2014 11:00 pm
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Scifi
Posted: May 24, 2017 12:33 pm
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