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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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If you study the above, you'll note that the topology involves some compromise, namely, a trade-off between a lower series resistor (for better drive of the following valve) versus a lower current draw through the CCS . This draw has to come through ...
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Hello,Here's an idea - uses a resistor in series with a current source on the negative supply to drop the voltage to the 6c33. Not sure how happy (sonically) the 6C33 will be with a 50k resistor on its grid. It would be huge problem at HF a...
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Romy, It seem what with the tacttile pleasures of boiled egg potting compound sensations you are going a bit Sakuma yourself.I will say this: I think Pieter is an absolute magician when it comes to iron; he's also a gentleman despite looking lik...
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Hi Paul,My understanding is that the placette has a unity gain buffer. At full CD ouput levels of 2Vrms into an S2 - it wouldn't quite get that into the S2s 16 ohms - but say it did, you'd be looking at about 109db from a pair...I'm not saying it wou...
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AlloWell this could be very interesting.... the Melq driver (at lower voltage) direct coupled to a 6C33 cathode follower run at low voltage, high current. Vincent looks like he's running about 80V 500mA, though in this case you'd need to use a r...
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Hi Romy
6CJ3 (or equivalent) is the one you want. Though I've not used them myself, I have pals who regard them highly, FWIW. It has an average current rating of 350mA, but don't forget that for a given draw on the supply, the average current throug...
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Sowter doesn't offer amorphous, though I believe Brian was looking into it a while ago.As for the sound of the mumetal core...well, let me preface this by saying that I have not directly compared amorphous to mumetal, but it sounded - how to put this...
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I sent an email to Brian asking... also about how far down in frequency their largest mumetal core could go.I see why you want those tap options now - essentially you want to be able to load down the 6e5p but still use all the secondary sections. The...
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Allo
Pieter is super-talented and a great guy; if you are a Larry David fan he looks a bit like his Dutch cousin...
The only problem is that he has a long waiting list... I don't think you would get the OPTs any time soon.
If we will try Sowters t...
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Hi Romy,Agreed about the S2 transformer being the most prominent it is here I think that mumetal will shine. I should have said that I was referring to the upper S2 covering 1k-12k or so. I wasn't too clear earlier - when I suggested rolling of...
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Hi Romy,I dunno if you mean the C-core materials itself or the completed transformers... if the former (perhaps a poor term in this context), thenhttp://www.elnamagnetics.comhave what you are looking for.Seach for AMCC - these are the Metglas C-...
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Hello Romy,
I just saw the photos - looks like fantastic work by Aleks.
As for the gift - well, if the project is a success and me and other S2 users can buy tweeters with that spec and sound , and without the risk and R&D costs - surely that's a g...
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Allo
I'm confused, but I just need to sit down and figure out what is going on here - geometrically speaking, that is. Never was good with 3d...
Having said that, what would you expect the sonic impact to be, and what's the reasoning behind it?
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Romy,Care to elaborate on the design you had in mind for this?Sounds very interesting indeed - might be possible to get it made cheaper...Thanks,cv...
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R,How are you crossing over the SA tweeter?Cheerscv...
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Allo RomyOk, I managed to get my measurement setup running. Behringer ECM8000/PC soundcard kind of thing.I measured the following tweeters:Focal TLRTAD PT-R9Aurum Cantus G1Fane 5022I don't have an absolute level calibrator and I need to take time to ...
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[quote user="Romy the Cat"]I can’t see the pictures. What I was thinking to connect the ribbon’s array in series and drive them with one custom better Bad’s transformer. Or perhaps if it were I would say .3R ribbons then 5-6 drivers would make a coup...
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Allo
Well, my baffles are for a vertical array. A friend of mine built a "clone" of the Nola Grand reference and got a very good deal on the G1 ribbons... will send you a PM.Don't be pissed about me keeping you in the dark regarding the ribbons; you...
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HiSomething sounds very wrong - maybe something fishy about your samples?Take a look at Nelson Pass measurements towards the end of the following document:http://www.passdiy.com/pdf/KleinHorn2.pdfwhere it looks like the PTR9s have similar sensitivity...
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AlohaWell, Martin does this as a labour of love, it's not his day job. They are fibreglass, and once he has constructed the mould, the manufacture is fairly straightforward, unlike say JLH's devices.So you are not paying for audiophile...
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Hope Romy won't mind a semi-commercial update...Martin will be selling these for AUD$ 1140, which is about $860 at current rates. He will have a website soon.Any more takers from the UK?Best,cv...
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Funny, I was just thinking about battery powering of amps... I know you have identified that the problem is more with the sources, but it would be interesting and quite feasible with the Melquiades and other components... wouldn't want to try it...
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Allo I tell you what it is that's putting everybody off, it's that bloody input stage biasing arrangement... The other thing is that people who know enough to build it have probably read a bunch of stuff here and there, and therefore been anointed in...
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Hi allIf anyone wants to go for a UK or US group buy on these, please let me know and we can co-ordinate with Martin. Likewise, if you can't find his email address online, drop me an email via the site and I will put you in touch.Cheers,cv...
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Ah, methinks you do Steve Schell a disservice Romy. He suspects that my RCA drivers have hairline cracks in their paper voice coils (certainly, one of the drivers is making strange noises) so I am getting his new replacements which are made of carbon...
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Allo fellas,
Regarding pricing, best if you check with Martin; I know what I'm paying but I had to commission them specially - I know a hell of a lot of work went into making the mould, jigs to support the mould, etc etc. Actually the 340s were my c...
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Hi Vitavox fans...
Thought this might be of interest - these are 160Hz 1.5" throat that Martin Seddon is making for me. The mounting flange isn't moulded on yet and the interior finish is alabaster like rather than glossy. I intend to damp the ...
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Allo R,I'm afraid I don't have access to them or pictures for a while. I will try and get some towards the end of next week. However, I did just find an old post of mine on one of the other forums ... I think this should give Bud a decent idea of wha...
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Ok, so it would look cool, but I'm not sure inducing an HF signal into your caps and having anything ferrous near the coil is a good idea. You'll get eddy currents even if there are non-ferrous conductors around.How this affects this end result is an...
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AlloIf you want to go for a cored device, I would recommend Sowter in the UK for a custom unit on a 100% mumetal core. I'm not sure what the delivery time would be though. You would definitely need to filter the LF before it hit t...
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