EC Aficionado (was: The Studio Jr.)

Discussion in 'Eddie Current' started by AppleheadMay, Nov 10, 2015.

  1. Ray

    Ray Friend

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    I believe I read somewhere or I recall Marv saying you didn’t need expensive tubes for this amp to sound good.
     
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  2. Taverius

    Taverius Smells like sausages

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    Wak me up when they reissue 396As and 2A3s.
     
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  3. purr1n

    purr1n Finding his inner redneck

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    I've got a stash of WE396A. As promised earlier, will measure to match the gain of the triodes and by distortion in the amp. Will price reasonably for my time and according to quality/rarity. Only to Af or worthy users. Will NOT sell these to people who plan on using them on Vali 2, Mjolnir 2, Garage, Chi-Fi, etc. Doing stuff like that makes me sad.
     
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  4. BillOhio

    BillOhio Friend

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    I've got half a dozen I'm not using. Also not using my Af.
     
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  5. pavi

    pavi Almost "Made"

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    i must say the pairing of the utopia with the 300b ec aficionado works wonderfully well. the soundstage is comfortable - certainly not like the 800s, but perfectly acceptable - and the bass has genuine presence - again, not like the abyss phi, but quite good.

    the overall synergy is sweet.
     
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  6. jexby

    jexby Posole Prince

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    did I miss reading a recommended pair of 300Bs for the EC Af ?
    please advise.
     
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  7. purr1n

    purr1n Finding his inner redneck

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    Remove legs and drop the bottom plate. You will need a DMM (or gear) that can measure the Vrms of a 40-50kHz signal. There is a little trim adjust on the HF frequency module. Attach alligator clips from heater pins of output socket to DMM. Lay amp on its side and turn on with 300B tubes. Turn up trim until DMM says 5V from 2.5V. 300Bs run at 5V, 2A3 runs at 2.5V. Wear long sleeved shirt and keep one hand in pocket while turning trim. If you want to play it safe, turn off power supply and let amp drain itself of power, and then make the adjustments. Shouldn't need to turn too much as the 5V is less demanding of current. Voila 300B Af. Ask Ravi to do this.
     
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  8. Jokerman7

    Jokerman7 Rando

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    Don't own the amp but I think it is better to disconnect the B+ (HV supply) first before trimming. After a satisfying voltage level is reached, connect the B+ again and turn on the amp for a little while, then fine tune. That will be how I would do it.
     
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  9. purr1n

    purr1n Finding his inner redneck

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    Yeah, probably a better idea because the trim is close to one of the output tube's pins. I'm used to working on these things being fully powered on, so I forget.

    Best to disconnect B+ at the PS chassis. I can't remember, but there might be connector that can easily be removed. The PS chassis opens from the top, unlike the main chassis that opens from the bottom.

    Since I am now providing more specific advice, I will conclude with the disclaimer that anyone attempting this can get injured or die.
     
    Last edited: Jan 8, 2019
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