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Ravenswood Console

Discussion in 'Tube Audio' started by drumbum, Sep 11, 2018.

  1. drumbum

    drumbum Super Member

    Messages:
    1,220
    Picked up a model 502 Ravenswood console. Works...with hum. Played record to test...working.

    Separate amp section with telefunken tubes...not sure which though.

    What to do, what to do?

    Hmmmm
     

     

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  2. RWood

    RWood Nobody goes there anymore. It's too crowded. Subscriber

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    Richmond, VA
    Please show pictures! Does the separate amp use ECL86 tubes?

    I have the amp but no preamp - I have been looking for info about it.

    For the hum, likely needs new filter caps. Does the hum appear on both channels and is it independent of the volume control?
     
  3. drumbum

    drumbum Super Member

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    1,220
    Yeah, believe so on the hum.
     
  4. gadget73

    gadget73 junk junkie Subscriber

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    These have come up as a subject of discussion a few times. You've probably heard the rumors of links to EH Scott, etc. I've seen pics of one of these before, and i seem to recall it appeared to be a well built unit, regardless of any possible affiliation to EH. If you have the complete console, I understand they are pretty rare so it may be worth keeping together.

    Agree on most likely being filter caps though.
     
  5. drumbum

    drumbum Super Member

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    1,220
    Tubes look to be ECL86/6gw8. Four of them. Push/pull config., correct?
     
    Last edited: Sep 11, 2018
  6. RWood

    RWood Nobody goes there anymore. It's too crowded. Subscriber

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    Yessir. That’s what mine has, too. Each of those tubes has a triode and a power pentode in it.

    I believe the power amp also powers the filaments of the preamp tubes, some with AC and the phono tubes with DC. I’d love to get some shots of the preamp when you get a chance, above and below deck.

    We can guide you through the recap if you’d like.
     

     

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  7. drumbum

    drumbum Super Member

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    Piccys will be a while until I find a place for it. Still in van.
     
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  8. RWood

    RWood Nobody goes there anymore. It's too crowded. Subscriber

    Messages:
    1,518
    Location:
    Richmond, VA
    That's cool - I can use them whenever.

    In the mean time, here is the power amp that I have:

    Ravenswood 2.jpg Ravenswood 4.jpg Ravenswood 3.jpg
     
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  9. drumbum

    drumbum Super Member

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  10. drumbum

    drumbum Super Member

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    It is an ugly little thing.;)
     
  11. drumbum

    drumbum Super Member

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    Anyone have an idea about output wattage of the ECL86 in push/pull?
     

     

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  12. Tinkerbelle

    Tinkerbelle Everything in Moderation Staff Member Super Mod Moderator Subscriber

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  13. drumbum

    drumbum Super Member

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    1,220
    Thanks for that Tinkerbelle.
    How did you decipher that to come up with the max watt output? Plate dissipation or math?
     
  14. drumbum

    drumbum Super Member

    Messages:
    1,220
    For those interested.
    Tubes on amp Telefunken 4x 6gw8/ecl86 and 1x 6ca4/ez81

    Preamp tubes Telefunken
    2x ecc81/12at7
    1x ech81/6aj8
    1x6ba6/ef93
    2x shielded unknown: now known 12ax7a/7025 sonotube andecf80/6bl8 telefunken

    and one Ratheon 6au6

    How do you differentiate between type 1 6gw8 and type 3?
    Three of these 6gw8 test good as type one, and one test bad, but tests good as type 3.

    Will try to post pics later.

    PS...this pre amp was a bear to get out because the volume knob had been glued on...sheesh

    Speakers are 8" Jensen w/ceramic magnets and tweeters I assume are Jensen also w/AlNiCo.
     
    Last edited: Sep 19, 2018
  15. drumbum

    drumbum Super Member

    Messages:
    1,220
    Amp has a little pot adj. Would this be for matching gain to the pre?
     
  16. gadget73

    gadget73 junk junkie Subscriber

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    need a schematic or at least internal pics. I'm guessing hum pot though.

    what do you mean type 1 and type 3 6GW8 ? They are a two section tube, so there is a triode and a power pentode section to test. Both must be good for the tube to actually be good.
     

     

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  17. drumbum

    drumbum Super Member

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    I believe its a bias pot.

    Gotcha on the 1 and 3. Not up to speed on tube stuff yet, (and grinding gears on SS)

    All tubes on amp have tested good on my tc-20.;)
     

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