Unusual HiFi products from the past.

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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    zad9fadf6pij.png
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  • mhardy6647
    mhardy6647 Posts: 35,550
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    SeleniumFalcon wrote: »
    I'm curious about this amplifier, I know William Z. Johnson (founder of Audio Research) had a store in Minneapolis and eventually worked for and then bought the Peploe Electronics company. I wonder if Goodell was involved somehow in the early audio scene.

    Indeed. It is unfamilar to me, too. I may ask some of the local gurus about it.
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    Thank you! @mhardy6647
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    This one's for you, @mhardy6647

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  • mhardy6647
    mhardy6647 Posts: 35,550
    edited April 2022
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    I think if I had an A-2, I could probably live with mono. B)

    So, about that uncaring ;) amplifier. I asked a couple of places, including the fine little hifi fourm, www.hifihaven.org

    A hifihavenite came up with the schematic (I've been busy today, so I didn't even think to look!):

    zzfzk6j41ggj.png

    One of the Northern New England gurus suggests a fairly simple approach:
    I would suspect since they are both octal tubes that they wired the 6L6 to operate as a triode. When the 6B4 is plugged in the resistor from screen to plate (6L6 triode connection) is floating.

    am8y7gsmqksb.png

    I am not sure how they manage the separate heater/cathode wiring of the indirectly heated 6L6 vs. the filament/cathode of the DHT 6B4? Maybe I am just really slow... :/
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    Thanks, that's great information. I thought maybe it used Billy Z's balanced cross-coupled design.
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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  • skrol
    skrol Posts: 3,493
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    mhardy6647 wrote: »
    JayCee wrote: »
    mhardy6647 wrote: »
    ^^^ Brutalist HiFi architecture ;)

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    Takes me back to "Computer Controlled" Pioneer of the 80's. Gotta love the LED meters, too....
    Topic: Pioneer Champagne Gold series HiFi's early 80's-https://www.avforums.co.za/index.php?topic=77357.0
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    I... I wouldn't mind havin' one of those 'Champagne Series' Pioneers... :blush:
    Not for any particular reason... just... 'cause.

    If you decide to put a Champagne system together, I have a CT-6R cassette deck in good working order that would make a nice addition.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.

    HT:
    Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    swyzljdrfge0.png

    Who knew good ole' B-more had a tape recorder manufacturer?
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  • engie490
    engie490 Posts: 447
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    p7tlbldnzyl0.jpg
    KEF Xq5s / Velodyne DD12 / Apollon Purifi 1ET6525SA / SST Thoebe II / Bluesound Node 130 / Oppo BDP-105D / Technics SP-15 w/SAEC WE-308SX & Ortofon AS-309 arms / Audio-Technica ART-1 & Dynavector XX2 Mk II carts
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  • mhardy6647
    mhardy6647 Posts: 35,550
    edited April 2022
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    Not a coffee table format, but 6 speakers 6, too -- from Heathkit! :)
    11947040984_4833bdcafa_c.jpg

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    source of inside page scan: https://worldradiohistory.com/Archive-Catalogs/Consumer/Heathkit-1961-Fall-Winter.pdf

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  • mhardy6647
    mhardy6647 Posts: 35,550
    edited April 2022
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    oh, and speaking of Heathkit...
    in case any of all y'all thought subwoofers and/or supertweeters were "modern" (e.g., 1970s) ideas...
    mais non, mon frere B)

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    source: https://worldradiohistory.com/Archive-Catalogs/Heathkit-Catalogs/Heathkit-Catalog-1959.pdf
    These used pretty good Jensen drivers. The SS-2 used the P8RS extended range 8" woofer and RP-103 compression tweeter and horn. The SS-1B used some 12" Jensen woofer (not sure which -- teh webz sez P15LS) and, IIRC, the redoubtable Jensen RP302 tweeter.
    I can vouch for the little two-ways (SS-2); they were/are quite pleasant & musical loudspeakers; great with tube amps. :)

    2y7x2vtiaoir.jpg
    (one of my erstwhile pair)

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    (borrowed photos from eBAY)


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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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  • mhardy6647
    mhardy6647 Posts: 35,550
    edited April 2022
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    "...the world's finest recorder of its type"

    That's kind of hard to argue with, isn't it? ;)
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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  • mhardy6647
    mhardy6647 Posts: 35,550
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    Speaking of Graybar -- WRH has a smattering of their catalogs online now.
    Talk about someone for everyone (in terms of electrical/electronic things, that is)! :)

    https://worldradiohistory.com/Graybar-Catalog.htm
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  • pitdogg2
    pitdogg2 Posts: 27,877
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    SeleniumFalcon wrote: »
    9sxhtucgqmvt.png

    15-16k in 1949 was a HUGE sum of money !! Shoot that was 6 automobiles worth right there
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  • engie490
    engie490 Posts: 447
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    pitdogg2 wrote: »
    SeleniumFalcon wrote: »
    9sxhtucgqmvt.png

    15-16k in 1949 was a HUGE sum of money !! Shoot that was 6 automobiles worth right there

    Oops...I think you added a number after the decimal point. I see $1.5K. Still a crap ton of money back then.
    KEF Xq5s / Velodyne DD12 / Apollon Purifi 1ET6525SA / SST Thoebe II / Bluesound Node 130 / Oppo BDP-105D / Technics SP-15 w/SAEC WE-308SX & Ortofon AS-309 arms / Audio-Technica ART-1 & Dynavector XX2 Mk II carts
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  • pitdogg2
    pitdogg2 Posts: 27,877
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    Pesky decimal thingies....
    Yes I caught it too late to fix.
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  • engie490
    engie490 Posts: 447
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    8nqcxdvjcn63.png

    This is for sale near me...from the ad:

    "Custom Coffee Table:

    Two 12" Audiobahn Special Edition Subwoofers

    1920 Watt Power Acoustik Amplifier w/ a Mosfet power supply

    Tuned to 33Hz: plays low, powerful, bass.

    Blue neon backlight.

    Plexiglass front, solid oak top, MDF sides/back, PVC ports.

    Does not include power supply to run indoors.

    Price: $400 for everything but the power supply.
    Part-out prices:
    Amp w/ bass knob: $150
    Subs: $100 each

    Love this thing, wife says it's time for it to go!"

    KEF Xq5s / Velodyne DD12 / Apollon Purifi 1ET6525SA / SST Thoebe II / Bluesound Node 130 / Oppo BDP-105D / Technics SP-15 w/SAEC WE-308SX & Ortofon AS-309 arms / Audio-Technica ART-1 & Dynavector XX2 Mk II carts
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
    edited April 2022
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    t90ed3rp6rzp.png

    How's that for a simple crossover?
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  • BlueBirdMusic
    BlueBirdMusic Posts: 3,095
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    Ken, I admire your appreciation of things that have come before us.
    "Sometimes you have to look to the past to understand where you are going in the future"
    Harry / Marietta GA
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    Thanks, I think it's good to understand, in a small way, where this hobby came from.
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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  • mhardy6647
    mhardy6647 Posts: 35,550
    edited April 2022
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    SeleniumFalcon wrote: »
    t90ed3rp6rzp.png

    How's that for a simple crossover?

    Both highs and lows, must be Boz... ak.

    B)

    PS I don't even recognize the Jensens in that 1949 ad! :o


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  • pitdogg2
    pitdogg2 Posts: 27,877
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    There sure were some strange looking Coaxial designs in my fathers youth. Many being 16 ohm drivers as well.
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  • mhardy6647
    mhardy6647 Posts: 35,550
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    16 ohms was a good load for transformer-coupled vacuum tube amplifiers -- still is! ;)

    That said, there is another way to design output transformerless tube amps than the lots of power triodes in parallel route (Atma-Sphere, Transcendent Sound, etc.). Philips and Stephens, among others, went the other route. ;)

    pzsuhlnb5b6y.png
    source; http://www.hifilit.com/Stephens/Stephens.htm

    coax with 500 ohm VCs. :)

    I have the 16 ohm morph of that coax -- only one, sadly. :/
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  • SeleniumFalcon
    SeleniumFalcon Posts: 4,368
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    k7nflv1uzu6a.png


    Customode?
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