EC Aficionado (was: The Studio Jr.)

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

  1. purr1n

    purr1n Finding his inner redneck

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    I thought Craig was providing new production TS 5AR4? Oh well.

    The major difference in sound with the rectifier swaps is likely to do with voltage drop (more drop = warmer, muddier, softer sound at worst, or romantic, luxuriousness, gloriousness at best). It sounds like the Chinese 5AR4 might be slightly uneven on the two sides. I know this was the case with one of the new production Sovteks we tried. It's just the nature of cheap (or even expensive) new production tubes and hard to make any strong assertion on brands without a lot of samples, and not just that, samples over time, which nobody in the world has time to test.

    I'd trust the old vintage stuff more because tubes those days were built for critical applications like military radar or IR trackers - this assuming the old vintage stuff hasn't been run into shit - which from eBay you never know despite "tests".

    The 5R4 I believe has more voltage drop than the 5AR4 / GZ34. Also, give the 5AR4 a TON of time to warm up. Spec is like 15 or 30 seconds, which with sharp audiophile ears means give that rectifier 30 minutes.
     
  2. purr1n

    purr1n Finding his inner redneck

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    Roll output transformers.
     
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  3. Griffon

    Griffon 2nd biggest asshole on SBAF

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    One of the most evil advice on SBAF.
     
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  4. purr1n

    purr1n Finding his inner redneck

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    Muahahahahahaha!
     
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  5. JK47

    JK47 The Beer Houdini

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    One of these things is not like the others, one of these things doesn't belong... Can you spot it?
    IMG_1530.jpg

    There's a toggle switch where the Right channel SE out was... Hmmmmmm

    It is a switch to go back and forth between Feedback and No Feedback !!!

    I've been poking around asking questions to @purr1n and others, playing with the idea of having the option of adjustable feedback in the AF (@purr1n advised against it and, suggested a simpler on/off switch). That's the route I took and it's nice to have the choice because the loss of gain hurts my semi efficient Fostex BLH speakers. It's quite the noticeable difference volume wise, but the tighteness of the bass and crisper presentation suit some styles of music more than others. I'm torn between the 2 settings, and will most likely go back and forth depending on mood and music selection.

    Some people were very helpful in my research and, others were as Borat would say NHAAAT !!! So I will not be publishing a guide, secretly telling people how to do this, or doing this mod for people. Ask a pro, I won't be held responsible for you blowing up your amp and gear. It took me a while to figure it out.

    IMG_1529.jpg

    EDIT: I didn't know EC offered an AF with the switch already, cool stuff.
     
    Last edited: Nov 9, 2018
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  6. Ash1412

    Ash1412 Friend

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    Awesome. I see the EC site's also been updated with a new AF "Plus" model with the NFB switch. How much feedback did you guys settle on? Is it gonna be the same for the Plus?
     
    Last edited: Nov 9, 2018
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  7. purr1n

    purr1n Finding his inner redneck

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    Haha. That's awesome. Makes sense to put the switch there since the SE outs are from the tertiary winding.

    Craig will do or undo the tertiary feedback mod for CUSTOMERS. That means means people who bought from him, not people who bought used.

    People who are not customers, that is who purchased used: I know Craig's builder who MAY need able to help. Just make sure you have original shipping boxes.

    The Af can easily be modified to run 300Bs too. Just a turn of a screw; but you will need to be able measure voltage at 40kHz+ because of the high frequency filament heaters.
     
  8. Mark W

    Mark W Rando

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    Does anyone know if it's ok to run a Bendix Red Bank 6385 as a driver with it's 500mA heater current ? Can the PS handle that ?
    thanks
     
  9. JoshMorr

    JoshMorr Friend

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    The bendix 6385 works, a friend here (former friend, his amp has pee in it) sent one around to a couple people. Don't trust my experience, it might still be on the edge of what works. Really nice driver, detailed, enhanced low end, but not bloomy. Saw the price tag and decided I could stick with we396a.
     
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  10. Taverius

    Taverius Smells like sausages

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    Alright, my speakers are here, I'm undecided wrt going speaker-out to sub and from there to speakers, or make use of the RCA outs on my 0feedback and drive the sub from that.

    Speakers are Omega 6" alnico in a custom cabinet.

    @purr1n i know you have strong opinions about the matter, but driving the sub from the tertiary should achieve the same coherency as passing speaker signal through, right?
     
  11. jexby

    jexby Posole Prince

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    Looking for a recommendation (or spare tube for sale) for a NOS Mullard GZ34/5AR4 that fits within the top case hole of the Af power supply, without the need for a socket saver / extender.

    are all NOS Mullard GZ34/5AR4 with earlier date codes like: f32 or f31,
    effectively "fat base" and won't fit in the case hole (too small)?
     
  12. famish99

    famish99 Friend

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    F31 for sure wouldn't fit, but @JoshMorr had a f32 mullard that he said fit in the Af. I'll know soon for sure since I bought it off him.
     
  13. EagleWings

    EagleWings Friend

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    I am very interested in getting the new Studio Jr.. But at $3200, the price of the amp alone will be a stretch to what I can comfortably afford. Based on some quick reading and a chat with famish99, I learnt that good 300B NOS tubes cost quite a lot. Even the new production WE 300B's that are going to be available soon, will cost $1300 a pair. Are there any other decent 300Bs that cost around $500 a pair?
     
    Last edited: Dec 12, 2018 at 3:56 AM
  14. allegro

    allegro Almost "Made"

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    Brent Jessee sells JJ 300B for $150 each. Genalex Gold Lion are about the same price.
     
    Last edited: Dec 12, 2018 at 7:28 AM
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  15. Taverius

    Taverius Smells like sausages

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    EMLs are about 500 a pair? The cheaper psvane are like 350, Sophia around the same iirc?

    Not sure which will sound good on it though.

    2A3 EML Solid plates sound great on my no-feedback AF, but apparently they don't do well on the DNA amps. Maybe marv has heard some current-production stuff on the Jr.
     
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