• July 17, 2023, 8:56 p.m.

    I love my music. Have done ever since I was introduced to Yes by my mother. At university, my final year thesis was on digitising music to be able to store and reporduce it. That's no big deal, I hear you say - but this was back in 1976 - way before CD's were invented - and I learned a lot about the limitiations of electronics in those days.[I had a great picture of the input & output of an osciloscope taken with my camera - with my long hair framing the square waves - I wish I had it now].

    I am no 'audiophile' (my ears have degraded too far for that) but I have a decent set up here at home. And, yes, I still have my old LPs and occasionally play them on my Denon deck.

  • Members 449 posts
    July 17, 2023, 9:09 p.m.

    Hi,

    I am so tempted to go snap a cell phone pic of my RCA Radiola 80. An actual first generation Major Armstrong superheterodyne design....

    Oh, yeah! AM Broadcast band. Big old tubes with two digit numbers. 24, 27, 45, and 80. Those 45s in push pull and driving a electrostatic loudspeaker. Audio reproduction so fine (not), that y'all will wind up absolutely in love with an Edison Cylinder. And, I got some of those, too!

    See, I am an RF engineer, and I design all manner of comm systems. But this RCA is the cornerstone of my collection. No matter how Lo Fi it is, it's a major turning point in radio receiver, and audio, design. Major Edwin Armstrong, that is. 1932. Who was also the Father of FM. But that's for later if this sub topic continues on! ;)

    It was that pic of the modern reproduction GE cathedral radio which prompted this thought.

    Stan

  • Members 1662 posts
    July 17, 2023, 9:33 p.m.

    While I'm not sure how far this off-topic music talk will or should go, but I really have to ask all of you photographers, who're clearly quite inspired by both music and the technology behind it:
    Where have many of you been, when I posted my thread about "Biggest inspirations/motivations" here, where I even mentioned music as one of my main sources of inspiration:

    live.staticflickr.com/65535/51964958970_867e7cbc09_b.jpg
    Major Second
    by simple.joy, on Flickr

    live.staticflickr.com/65535/51585060900_092e5f06d2_b.jpg
    Music: frequency of life itself
    by simple.joy, on Flickr

    live.staticflickr.com/65535/52159734276_0a0709ca33_b.jpg
    Music is both - particle and wave
    by simple.joy, on Flickr

    I'd love to see some creative shots, capturing either what you perceive or imagine while listening to music or high-end presentational shots of your audio equipment and - if possible - a couple of words about all of the underlying thoughts as well!

    C'mon - show some pictures! 😉

    That's quite fascinating. The CD (at least development) was already underway when I was born, but I remember tapes as well and how very interesting everything got once digital files started to appear. (I loved downloading MIDI files.)

    BTW. I sometimes shoot with lenses from oscilloscope cameras - have you ever tried adapting one of those? They're very interesting...

  • Members 599 posts
    July 17, 2023, 10:04 p.m.

    Your mother had good taste. Yes was one of my favs back in the day, along with older Genesis [with Peter Gabriel] ELP, P Floyd, Bowie, Beatles etc etc..
    Many of those artists had their CD's 'remastered' for improved sound which made for more enjoyable listening.

  • Members 2365 posts
    July 17, 2023, 10:42 p.m.

    great topic, wont go into my past, can remember 4 years ago my daughter was selected to sing in a state choir, for a school spectactular music event that she sings for the past few years . one year instead of waiting in the car to pick her up after practice in this indoor ampitheatre the security people invited me in to listern to the rehersals. 30 peice choir. and i can tell you it was truly amazing experience listerning live . from that experience there is NO audio equipment that even comes close
    to reproducing the sectacular sound i experinced that day. when i watched the main event live that was ampified to the 5000 patrons in a entertainment center i was glad i actually got to listern how music should be listerned to "live" no audio equipment involved. today my daughter play solo gigs and the high end comercial colum array pa systems (electrovoice ev30 1000w) are absolutly mind blowing compared to the equipment i used to build 40 years ago.

  • Members 50 posts
    July 18, 2023, 1:02 a.m.

    Hi Stan! That old radio is not a modern replica- it is the real thing. I replaced the coils and found the tubes around 1981. The original speaker survived the years. I resorted everything on the chassis but the wood still has kind of that mildew odor. I also had an old Philxo Am radio but I was unable to replace the speaker. Seems there is a somewhat higher voltage at the speaker leads.

    "RCA" Brings back memories" We had a TV/radio, and Phonograph console where the CRT was oriented vertically- face upward and we viewed the screen via a mirror on the lid. There was a belief, at the time, that looking directed the picture tube exposed folks to harmful rays. The radio had a motorized station selector series of push buttons.

  • Members 516 posts
    July 18, 2023, 3:16 a.m.

    @EdShapiro

    White distilled vinegar will kill most mold and mildew (buried) spores and the vinegar smell quickly disappears.
    The theory is that they overfeed on it.
    Contrary to popular belief they feed on bleach and water even though it seems to do a good surface clean up job initially.

    Use / wet paper kitchen towels on the inside and outside of the cabinet, and as always, watch for color bleed on the paper towels.

    a4.pbase.com/o9/56/215056/1/162283510.9n5i1FnC.untitled.png

    Wax impregnated cloth braided wiring can be cleaned with IPA (isopropyl alcohol) and a small acid brush, or toothbrush. They feed on the wax.
    70% IPA has the best alcohol to water ratio for cleaning purposes - fact. lol
    Use stronger if you wish.

    Stay away from rubbing alcohol as many of them contain oil !

    Baking soda, charcoal or cat-litter will absorb odors (seal in a heavy duty plastic bag for a few days).
    Dryer-sheets will make old musty books smell pretty (again, seal in a plastic bag / container) if you can tolerate the perfume smell. lol

  • Members 1738 posts
    July 18, 2023, 3:50 a.m.

    As I remember, there were actual harmful rays from some of the vacuum tube power supplies. Stan?

  • Members 516 posts
    July 18, 2023, 5:01 a.m.

    The (center tapped) high voltage winding of a 1930s filament power transformer can be anywhere from 600V to 800V ...and at times much higher ~1200V
    By the way... the center tap of the high voltage winding is the most Negative point in a tube radio / amplifier.

    Small tabletop tube radios with wooden and (Bakelite) plastic cabinets employed “hot chassis” where the metal chassis is directly tied to one side of the AC line, and the metal mounting screws holding the chassis along with control shafts were also “hot” with AC voltage !
    Completely safe when buttoned-up and control knobs secure.

    The plural of chassis is chassis, pronunciation is different. lol

  • Members 449 posts
    July 18, 2023, 12:41 p.m.

    Hi,

    Yep. X-rays. From the diode tube for the CRT high voltage. The one in the shield box.

    As long as the shield cover was in place, you were fine. Many times, though, the cover was removed to pull the tube for checking (at the local drug store) and never put back. Tubes leant themselves to User Service. An actually repairman knew to put the shield back. Heck, he knew that this particular tube rarely failed in the first place and didn't remove the shield.

    Stan

  • Members 243 posts
    July 18, 2023, 12:41 p.m.

    I have a Zenith 12S265, 7S363, a Philco 60, 620 and 118X console, and a Majestic 6.

  • Members 449 posts
    July 18, 2023, 12:44 p.m.

    Hi,

    The really early radios used headphones. No audio power amp tubes. Those usually ran on sets of batteries.

    Later, they ran on AC and had an audio power tube. Known as an Audion. Then they used electrostatic speakers. The plate vtage runs thru the windings. Produced the magnetic field which later on was provided by a permanent magnet.

    So it can be difficult to obtain a speaker today for those old radios.

    Stan

  • Members 449 posts
    July 18, 2023, 12:48 p.m.

    IMG_20230718_084540_916.jpgHi,

    This is what I thought that one was. This is a 1980s GE AM FM reproduction.

    Hard to tell from the front. Obviously, opening the back would make ID easy! But the new one says No User Serviceable Parts Inside. Ha!

    IMG_20230718_084540_916.jpg

    JPG, 288.4 KB, uploaded by StanDisbrow on July 18, 2023.

  • July 18, 2023, 1:10 p.m.

    What you are describing is not an electrostatic speaker, but a magnetodynamic speaker with a DC coil producing the fixed magnetic field.

    David

  • July 18, 2023, 1:13 p.m.

    I built an electrostatic speaker for a school project, back in the day. It worked quite well, but wasn't very loud. Not great for the kind of music I was listening to at the time.

  • July 18, 2023, 2:01 p.m.

    To get a decent sound level, even with a Quad ESL, you need a polarizing voltage of about 5kV, I believe!

    David

  • Members 243 posts
    July 18, 2023, 3:08 p.m.

    I like the pretty wood.

  • Members 449 posts
    July 18, 2023, 4:15 p.m.

    Hi,

    However, they called them electrostatic speakers at the time they implemented them. The term is right in the service manuals. So I shall stick with that nomenclature lest I royally confuse the folks who still work on the old things. ;)

    And there is another lost concept: The Service Manual for electronics. I think I penned about the last of them for modern electronics when at Ericsson in the 1990s.

    Stan