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  • treitz3treitz3 Posts: 13,168
    I have seen one of those. Only one in my entire lifetime. Apparently they are a familiar sight in Australia and there is actually a name for them. Basically, like a "wave" in the atmosphere from one end of the sky to the other, straight as an arrow....at least in my sighting. Cool as hell!

    Tom
    In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence.

    The best way to enjoy digital music reproduction is to never listen to good analogue reproduction.

    ~ When the law ends, tyranny begins ~
  • EndersShadowEndersShadow Posts: 16,937
    ^Awesome!
    "....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963)
  • mhardy6647mhardy6647 Posts: 23,640
    edited November 14
    a bit of dissimilar twin triode cheesecake for those of you (us) who are into such things* ... I was just checkin' some 6EM7s before sending 'em along to a hifi paisan/fellow traveler who is doing some restoration/repair of a recalcitrant (commercial) SET amplifier. They were so cute, I had to snap a few piccies. B)


    old school:

    49064549686_4f293a1ba4_h.jpgDSC_7527 (2) by Mark Hardy, on Flickr

    new school:

    49064549586_cebb0a5452_h.jpgDSC_7531 (2) by Mark Hardy, on Flickr

    _____________
    * and not that there's anything wrong with that. :#
  • ClipdatClipdat Posts: 7,298
    20191104130341_Review_AudioQuest_Niagara_1200_Intern.jpeg
    "Electronic music is human sound adapting to indulge technology, and for some, it feels like the signature sound of energy. New and abstract sounds over hypnotic rhythms can conjure vast soundscapes for escape, pleasure, and transcendence."
  • joecoulsonjoecoulson Posts: 3,723
    Oh yeah ^
    Auralic Vega G1/Rega TT/Denon SACD - Parasound P6 - PS Audio M700x2 - Elac Adante AF-61 - AQ Niagara 5000 - SVS SB16u
  • verbverb Posts: 8,260
    gvnf38m8o9qi.jpg

    Bad pic, but this guy was seen along the deer run behind my house and the rest of the subdivision. Looks well fed! :smile:
    9bdbyv97rhuq.png
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • verbverb Posts: 8,260
    mhardy6647 wrote: »
    a bit of dissimilar twin triode cheesecake for those of you (us) who are into such things* ... I was just checkin' some 6EM7s before sending 'em along to a hifi paisan/fellow traveler who is doing some restoration/repair of a recalcitrant (commercial) SET amplifier. They were so cute, I had to snap a few piccies. B)


    _____________
    * and not that there's anything wrong with that. :#

    Interesting design Doc! What is the premise behind the triodes being dissimilar?
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • mhardy6647mhardy6647 Posts: 23,640
    edited November 14
    verb wrote: »

    Interesting design Doc! What is the premise behind the triodes being dissimilar?

    Fairly late in the tube era, competition and price constraints led to the development of multi-purpose tubes, mostly driven by a market for low-price TVs (e.g., in the vicinity of the late-1950s/early-1960s economic downturn that also saw the debut of the US 'compact' car segment). Looks like the 6EM7 dates from ca. 1961 http://www.tubebooks.org/tubedata/HB-3/Receiving_Tubes_Part_2/6EM7.PDF

    The 6EM7 was designed for use in color or black and white TVs -- the medium-high mu, small signal triode for vertical deflection oscillator duty and the low mu power triode as the vertical deflection amplifier.

    1qkwu68g7pzf.png
    From RCA manual RC-26 (1968).

    Much later, folks realized that tubes like this (there were other, similar tubes like the 6DN7) were well suited for the construction of simple, inexpensive single-ended triode hifi amplifiers! :) The beauty of a tube like the 6EM7 is that only one tube is required for each channel of a fully-functional power amplifier (the high-mu triode used as voltage amp and the low mu triode used as power amp). Doc Bottlehead's epochal S*E*X (Single-Ended eXperimenter's) amp was a popular example (6DN7), sold as a kit. The current version uses a similar tube in a Compactron envelope.
    https://bottlehead.com/product/single-ended-experimenters-kit-3-0-for-headphones-sensitive-speakers/

    aepo9jjatyfw.png

    Here's a 6EM7 amp design, e.g.
    https://diyaudioprojects.com/Tubes/6EM7-SET-Amplifier/

    EDIT: Oh, I forgot to mention: amplifiers using tubes like this, using a single tube per channel, are known as spud amps (one-tubers) :)
  • mhardy6647mhardy6647 Posts: 23,640
    edited November 14
    meanwhile, a blast from the past courtesy of Drew A. Kaplan's sort-of eponymous enterprise ;)

    qbe4e4sz0jr8.png
    https://ia800306.us.archive.org/26/items/1984-Fall-DAK-Catalog/1984-Fall-DAK-Catalog.pdf
  • verbverb Posts: 8,260
    Thanks Mark! Well what do ya know! I never really noticed, all googly eyed and all when I got this thing! My SEX 2.1! :smile: Sylvania 6DN7's!
    6o1q4l522xmm.png
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • verbverb Posts: 8,260
    Clipdat wrote: »
    20191104130341_Review_AudioQuest_Niagara_1200_Intern.jpeg

    No magic dust? :smile:
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • mhardy6647mhardy6647 Posts: 23,640
    edited November 14
    I forgot you had S*E*X! I mean... a S*E*X... umm, I mean... well, you know...

    ;)

    Same kinda deal, is the 6DN7. The power triode section is the one with the big heat dissipation structure on it (arrow). The other triode section is kinda wussy lookin'.

    nar36npprgta.png
  • verbverb Posts: 8,260
    mhardy6647 wrote: »
    I forgot you had S*E*X! I mean... a S*E*X... umm, I mean... well, you know...

    ;)

    Yep! One triode is T-shaped (typical sylvania), the other a small rectangular cross section.
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • pitdogg2pitdogg2 Posts: 14,943
    edited November 14
    mhardy6647 wrote: »
    a bit of dissimilar twin triode cheesecake for those of you (us) who are into such things* ... I was just checkin' some 6EM7s before sending 'em along to a hifi paisan/fellow traveler who is doing some restoration/repair of a recalcitrant (commercial) SET amplifier. They were so cute, I had to snap a few piccies. B)


    old school:

    49064549686_4f293a1ba4_h.jpgDSC_7527 (2) by Mark Hardy, on Flickr

    new school:

    49064549586_cebb0a5452_h.jpgDSC_7531 (2) by Mark Hardy, on Flickr

    _____________
    * and not that there's anything wrong with that. :#

    Many folks dislike the coin base tubes that came along. Did you ever hear a difference in sound quality with coin base as oppose to the octal base?
  • verbverb Posts: 8,260
    Funny Ivan I looked at that too! Again at the time I was such a tube newbie. Those are the only ones I have for this rig.

    Oh Lord, I just found myself looking for some better NOS 6ND7 tubes! Help me! :smile:
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • pitdogg2pitdogg2 Posts: 14,943
    verb wrote: »
    Funny Ivan I looked at that too! Again at the time I was such a tube newbie. Those are the only ones I have for this rig.

    Oh Lord, I just found myself looking for some better NOS 6ND7 tubes! Help me! :smile:

    I have a few coin base 6sn7 and 6bx7 and I can state they are "unpleasant" to my ears.
  • verbverb Posts: 8,260
    pitdogg2 wrote: »
    verb wrote: »
    Funny Ivan I looked at that too! Again at the time I was such a tube newbie. Those are the only ones I have for this rig.

    Oh Lord, I just found myself looking for some better NOS 6ND7 tubes! Help me! :smile:

    I have a few coin base 6sn7 and 6bx7 and I can state they are "unpleasant" to my ears.

    Interesting, as they look like IMO, just trying to reduce manufacturing costs as much as possible.
    Basement: Polk SDA SRS, Cary SLP-05 Pre, Enlightened Audio Designs CD Transport, Northstar Designs Excelsio DAC, Silnote Morpheus Ref2 Digital Cable, Marantz SA-14 SACD, McIntosh MC300 Amp, Furman 15PFi Power Conditioner, Pangea Power Cables, Wireworld Oasis 8 RCA IC's, MIT Shotgun S3 IC's, MIT Shotgun S1 Bi-Wire speaker cables
    Office: PC, EAR Acute CD Player, EAR 834L Pre, PASS ACA Monoblocks, Denon UDR-F10 Cassette, Acoustic Technologies Classic FR Speakers, SVS SB12 Plus sub, MIT AVt2 speaker cables, IFI Purifier2, AQ Cinnamon USB cable, Groneberg Quatro Reference IC's
    Spare Room: , Antique Sound Labs Wave AV-8 Monoblocks, Tisbury Mini Passive Pre, Tjoeb 99 tube CD player (modified Marantz CD-38), Analysis Plus Oval 9's, Zu Jumpers, AudioEngine B1 Streamer, Klipsch RB-61 v2, SVS PB1000 sub, Blue Jeans RCA IC's
    Living Room: Peachtree Nova Integrated, Cambridge CXN v2 Streamer, Furman 15PFi Power Conditioner, Polk RT265 In Wall Speakers, Polk DSW Pro 660wi sub
  • pitdogg2pitdogg2 Posts: 14,943
    verb wrote: »
    pitdogg2 wrote: »
    verb wrote: »
    Funny Ivan I looked at that too! Again at the time I was such a tube newbie. Those are the only ones I have for this rig.

    Oh Lord, I just found myself looking for some better NOS 6ND7 tubes! Help me! :smile:

    I have a few coin base 6sn7 and 6bx7 and I can state they are "unpleasant" to my ears.

    Interesting, as they look like IMO, just trying to reduce manufacturing costs as much as possible.

    Well sure but that little bit of plastic was not expensive... The tiny bits inside were, so I'm sure there was cost measure's there as well.
  • mhardy6647mhardy6647 Posts: 23,640
    pitdogg2 wrote: »
    mhardy6647 wrote: »
    a bit of dissimilar twin triode cheesecake for those of you (us) who are into such things* ... I was just checkin' some 6EM7s before sending 'em along to a hifi paisan/fellow traveler who is doing some restoration/repair of a recalcitrant (commercial) SET amplifier. They were so cute, I had to snap a few piccies. B)


    old school:

    49064549686_4f293a1ba4_h.jpgDSC_7527 (2) by Mark Hardy, on Flickr

    new school:

    49064549586_cebb0a5452_h.jpgDSC_7531 (2) by Mark Hardy, on Flickr

    _____________
    * and not that there's anything wrong with that. :#

    Many folks dislike the coin base tubes that came along. Did you ever hear a difference in sound quality with coin base as oppose to the octal base?

    Didn't listen to these.

    Simply put, Thomas Myer (Vinyl Savior/Tube of the Month) puts the coin base tubes in perspective. There's nothing wrong with 'em compared to the 'normal' base tubes.
  • daddyjtdaddyjt Posts: 1,103
    Nightfall wrote: »
    Gas was 99 cents a gallon when I got my license. I could have filled my current car for a freaking ten spot. It's all good though, I feel for the oil big wigs. They were rummaging through garbage for meals, at least now they can afford Ramen now and again.

    I was 18 when Die Hard came out in ‘88...

    Nakatomi Plaza, 12/24/88
    5amq1myg4upf.jpeg

    Too much stuff to keep track of.

    Currently enjoying: Legacy Focus 20/20, McCormack DNA 225, Bill D C1, Oppo 105
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