Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups
Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups
Asher Guitars WD Music Products Amplified Parts Mod Kits DIY Nordstarnd Pickups

Was the 5E3 a Western Elec/Bell Labs design?

Discussion in 'Amp Central Station' started by BassMasterMkII, Aug 20, 2009.

  1. ThermionicScott

    ThermionicScott Poster Extraordinaire

    Dec 3, 2005

    If anyone's interested, I cloned that tube chart when I built my 5E7.


    Forgot to "justify" the text at the bottom though. Whoops...

    - Scott

  2. jefrs

    jefrs Doctor of Teleocity

    Nov 20, 2007
    Newbury, England
    This side of the pond it was Mullard that patented and published valve circuit designs. The idea being to get manufacturers to use their valves.

    You won't find patent disclaimers because our patent law is different (so is copyright), especially for public dedicated i.e. it's free but it stops the greedy from grabbing it.

    Mullard bought Philips in 1923 and Philips bought Mullard in 1927, go figure. There is some tenuous form of company connection to Valvo, Siemens, Amperex and Sovtek.

  3. muchxs

    muchxs Doctor of Teleocity

    Aug 14, 2004
    New England
    Altec speaker w/ "Feb 51" and "WE 37" (Western Electric) inspector's stamp.

    Attached Files:

  4. mojo2001

    mojo2001 Tele-Holic

    Feb 5, 2008
    That speaker is the famous Western Electric/Altec 755A, one of the "700 series" speakers I alluded to.

    By 1951, there were no more Western Electric labeled 755As (decal on magnet) but these Altecs were made out of WE parts stock.

    Western Electric labeled 755a usually have five or six WE inspectors stamps which tell you what they were tested for.

    The Bell System used these speakers (Altec labeled) into the mid 50s for a variety of Central Office monitoring tasks and put them in wood wall cabinets. Apparently WE approved them before they went into Bell System apps.

    Here is a link to pics of WE and Altec labeled 755As on my hi-fi business site:

    These are really, really excellent speakers. The frequency response was carefully tailored for intelligibility according to hearing tests done on tens of thousands of individuals at the New York World's fair.

    I used these in my stereo system for years. Just bought a second one to make a pair again on ebay yesterday, in fact! They belong in 2 cu.ft. slant front wall cabs. Glorious sound!

    The most famous consumer application was as the HF driver in the AR-1 loudspeaker, a revolutionary product based on the sealed box "infinite baffle" loading for the woofer.

  5. itsa68

    itsa68 Tele-Meister

    May 17, 2011
    I've been reading through old RCA tube manuals as I build a 300b stereo hifi amp, and remembered this topic. LOVING the thread

  6. xafinity

    xafinity Friend of Leo's Silver Supporter

    Dec 24, 2015
    my Mom's basement
    come on kid, let's build an amp!

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