MLA
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Posts posted by MLA
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Very small does not mix too well with high voltage + significant wattage. See Spritzer’s page for a good overview of what the amp size limitations are: https://mjolnir-audio.com/
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7 hours ago, vivolo said:
They are only 1/4 watt, and are rated for 300V.
They are mil spec and thus derated, so can actually handle higher loads. If you look at Vishay’s CMF line, it’’s the same resistors as RN60D but with about twice as high ratings.
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Could you please update my table numbers to 6, 3, 3, 3, 0 ? (i.e. one more complete PSU setup) ?
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10 hours ago, samsie said:
I know I need four boards, but how do I connect the negative input rail ?
Source must be balanced (or made balanced as per Pars suggestion above).
Then, for one balanced channel, one board amplifies the positive signal and another board amplifies the negative signal.
In this context, it might help to think of a balanced source as a four channel device.
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Hands raised
, two full sets.
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+1; JoeMat suggested a separate PSU for the +220V in a previous post somewhere.
I'm planning on using the PSU Kevin created for the tube input board for the +220V (have to check it works first though :)).
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Yes, just slightly bigger than the squarewave. I logged in to check prices and PCBWAY would send me a pack of 10 for about 20 USD if I repeat my order. Good times for DIYers :)
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Not its forte. Really shines with planars though.
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Have a couple of these since last GB (psu for the tube ubal to bal board). Guess they would do the trick (possibly with some component updates to handle +220V) ?
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To ask away on top of the above
What’s your grounding scheme? Inputs look floating, is pot floating too? Amp board and psu? A small diagram would be very helpful in troubleshooting.
Also, do you have some form of virtual ground or elevated reference for the heater voltage?
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Trafo depends somewhat on the psu also: if you’re using GRHV you only have 20-30V or so in dropout voltage (or even less if I remember correctly).
360V secondaries puts you at about 510V DC unregulated, so that leaves quite a bit to be turned into heat by the psu pass transistors if you’re aiming for 400V output.
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I've used a bunch of MKDSN 5.08 spaced from Mouser, they exist (for example 651-1729131).
Also, note that the 400V is its CAT III rating (see data sheet).
The CAT II rating, which is more relevant for an amplifier for home use, (think broadly home appliances connected to a wall outlet) is 630V.
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According to their web, they’ve taken over distributorship for Denmark and in the process renegotiated lower prices with Stax.
Stax lists them as official distributor on their international pages.
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+1 on Kawai. I have both a Yamaha and a Kawai at home; the lighter Kawai action is preferable.
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2 hours ago, johnwmclean said:
Anyone had time with a RME ADI 2 DAC?
Got it a few months back. Will not be selling it.
Sound is great, parametric eq is really handy for some hp’s/recordings, and it gets reassuringly warm
Archimago has all the numbers:
http://archimago.blogspot.com/2018/10/measurements-rme-adi-2-pro-fs-as-dac.html?m=1
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Yes. Highly recommended.
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Package arrived!
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Payment sent. Thanks!
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+1. Many thanks!
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These exist. I built one, works fine.
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F192504438683
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So, tried the youtube video songs on both 007 and 009 with both Carbon and GG, and I can't hear any sounds that do not seem to be meant to be part of the mix.
There's however a ton of bass content in the first song and even more so in the following OG Heartthrob. It's not many songs that make me want to eq down the bass substantially on the 009's; these definitely do. Can't run youtube stuff through the spectrum analyzer in any simple way, but to me it sound like there's more going on in the lower freqs than what's healthy for home listening systems. Maybe mixed for clubs?
I've turned it up as loud as I'm comfortable with, so can't help further I'm afraid.
Steven Wilson's "To the bone" has a few massive bass tones during the intro. Would you mind having a listen and see if you hear the same type of distortion?
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40 minutes ago, powertoold said:
don't think it's a matter of loud mastering. Even if a song is mastered loudly, I don't think it should cause distortion.
It’s not about the loud volume in itself, it’s the process of getting to a loud master, by adding lots of gain, compression and limiting, that can cause audible distortion.
https://en.m.wikipedia.org/wiki/Loudness_war
Anyway, I’ll have a listen tonight to your link and report how my gear behaves...
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37 minutes ago, powertoold said:
What confuding factor in all of this is why my Porta Pros can sound fine on a song that my 007 struggles with lol
It’s the curse of high end gear; it’s actually capable of reproducing the recording in full. Less capable gear tend to be more ”forgiving” of poor recordings, since it does not resolve as well.
, two full sets.
Voluntary amp builders?
in Do It Yourself
Posted
So, about sizes. It will be hard to get any of the KG designs that live here really small.
I happen to have a ADI2 home at the moment, so took a couple of shots.
This is the ADI2 on top of a eCFA (in a repurposed case that actually used to hold a KGSS clone). Note that this eCFA runs a lot lower than max current, otherwise the case gets way too hot. All boards inside are on good heatsinks but there's simply not enough circulation to run full power. External heatsinks is I think a must if you want to run this one full out.
Same thing with a KGDT (solid state input, tube output, lives in a thread somewhere here), in a highly utalitarian Modushop case:
Both of these are shoehorn builds as far as my skills go; Birgir could probably fit it all a little tighter, but not me
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