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

NAD another weird old Valco!!

Discussion in 'Glowing Bottle Tube Amp Forum' started by Tomm Williams, Sep 15, 2017.

  1. Tomm Williams

    Tomm Williams Tele-Meister

    416
    Jun 11, 2016
    USA
    I just can't say "no" to funky old amps, especially if they're Valcos!!!. Threw out an offer and the seller said yes. Should have it next week. image.jpeg image.jpeg image.jpeg image.jpeg
     
    Prophetsnake, RLee77, dkmw and 7 others like this.

  2. ftbtx

    ftbtx Tele-Holic Silver Supporter

    Cool find, have fun! I'm a sucker for old Ampro stuff myself.
     

  3. Mountianjustice

    Mountianjustice Tele-Meister

    Looks all octal. Maybe a 5c1 type of thing?
     

  4. Bendyha

    Bendyha Tele-Afflicted Ad Free Member

    Mar 26, 2014
    Northern Germany
    Nice page here about the A46
    http://www.dougcircuits.com/electromuse.html
    And he has drawn up the schematic, looks like it should sound a treat...Congratulatios.
    If he is right with the date, and I assume he is, then I find the use of the NFB from the output being sent to the cathode of the phase inverter as a variable brillance (presence control) very interesting. It predates Fenders simplified use of this technique in the 5B6 of 1952, although his 5E6 version is probably superior.
    [​IMG]

    There is a little brother for this amp which is single ended. Looks like it would be a great slide amp.

    upload_2017-9-15_21-48-6.png
     
    Last edited: Sep 15, 2017
    jimytheassassin and aerhed like this.

  5. Tomm Williams

    Tomm Williams Tele-Meister

    416
    Jun 11, 2016
    USA

  6. BigDaddyLH

    BigDaddyLH Telefied Ad Free Member

    Electromuse -- what a cool name!
     

  7. brookdalebill

    brookdalebill Telefied Ad Free Member

    Age:
    60
    Nov 15, 2009
    Austin, Tx

  8. RoscoeElegante

    RoscoeElegante Tele-Afflicted

    Feb 19, 2015
    TooFarFromCanada
    Worth it just for the name!
     

  9. Ira7

    Ira7 Poster Extraordinaire

    Age:
    61
    Jan 8, 2008
    Coral Springs, FL
    What the heck is a QUALITY pot?

    Could this be an early incarnation of gain?
     

  10. jimash

    jimash Friend of Leo's

    Nov 5, 2013
    NJ
    I like that one. And it has a "Quality" control . Always wanted one of those.
     
    SPUDCASTER and Grux like this.

  11. Tomm Williams

    Tomm Williams Tele-Meister

    416
    Jun 11, 2016
    USA
    Yes strange name but my understanding is it's a Brilliance switch. It's hard to read but above the knob it's marked as such with "quality" marked below.
     

  12. Ira7

    Ira7 Poster Extraordinaire

    Age:
    61
    Jan 8, 2008
    Coral Springs, FL
    Everyone on the planet finds cool stuff like this except me.
     
    SnidelyWhiplash and dented like this.

  13. Tomm Williams

    Tomm Williams Tele-Meister

    416
    Jun 11, 2016
    USA
    Yes it was a lucky find and for $350 I have no complaints
     

  14. mitchfit

    mitchfit Tele-Holic

    823
    Aug 14, 2011
    north east texas
    "What the heck is a QUALITY pot?"

    according to page amp schematic comes from, a negative feedback control.

    mitchfit
     

  15. cabra velha

    cabra velha Tele-Holic Platinum Supporter

    915
    Jan 21, 2016
    sub arctic
    What a beauty.

    I can imagine a sound check where someone down on the floor shouts "you need to turn down your quality".
     
    mexicanyella likes this.

  16. Tomm Williams

    Tomm Williams Tele-Meister

    416
    Jun 11, 2016
    USA
    I could only hope to hear those comments instead of the ones I do:lol::lol::lol:
     

  17. Ira7

    Ira7 Poster Extraordinaire

    Age:
    61
    Jan 8, 2008
    Coral Springs, FL
    I'm a moron when it comes to electronics (and many other things), so that explanation doesn't help me at all.
     

  18. dented

    dented Poster Extraordinaire Platinum Supporter

    Apr 17, 2006
    Back at the Beach
    That amp is so cool. I bet it sounds great. Congrats.
     

  19. jimash

    jimash Friend of Leo's

    Nov 5, 2013
    NJ
    Negative feedback is kind of like active noise reduction. It makes an amp work quieter, but it also gives it a suppressed "on a leash" feeling. So as you remove the negative feedback the amp gets looser, and more snarly, and more dynamic, but t might hiss a bit.
    It;s one of the largest differences between the '65 re-issues, and the '68s.
     

  20. mitchfit

    mitchfit Tele-Holic

    823
    Aug 14, 2011
    north east texas
    Ira7,

    below a link to the circuit design that Dick Denny used for the first "top boost" AC30 vox amp.

    http://www.stevesamps.co.uk/?page_id=287

    4th paragraph from the bottom explains the effect of negative feedback on output signal.

    as "clean" reproduction was the goal of high end guitar amps of that period, and the amplifier had just switched from 2x EL 34* output tubes to 4x EL 84** running very hot, i'd say it was used to increase the headroom. [cleans]


    mitchfit

    *about 50 watt
    **about 30 watt
     

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