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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy, my experience with the Lundahl amorphous core transformenrs is limited to my new phono stage, and I have have been dealing other issues enough that I am not ready to write much about it yet.Still, there are qualities worth noting...
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I am not too tailed or interested with what this Troels Gravesen does but his use of off the shelf Lundahl with two 6C33C anodes is kind of fun to watch.
http://www.troelsgravesen.dk/AudioMirror-6C33.htm
He uses Audio Mirror DUAL ...
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Rony,
After reading my post about the undersized core (for the given current) of Lundahl transformers you might be an impression that Lundahl are some kind of second choice. The undersized amorphous Lundahls forum is second chose for an ultimate ful...
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I did an interesting experiment today trying to learn if those Melquiades driver tubes have even gain. The Russian tubes are notorious to have very widely spreading specification, so….
I took 14 6E6P. Some of then were new, some used and some violen...
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Anthony, I do not know anything about them. I used Jensens, Altecs, EVs, Ears, Shelters, Grahams, UTCs, S&Bs, Otophones, Tamuras, Denons, Cotters, ET, Siemenss, Sowters and few others no-name transformers and I can comment of them. I only heard a...
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[quote user="Romy the Cat"]I bought the Lundahl chokes for L1 and was not able to us them and they were insultingly sharp. For the L1 you would need more henries and more DCR, the higher DCR will sound better and the “bad” and “cheap” Hammond chokes ...
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First of all: I have moved this thread into the Milq Forum…..
[quote user="RonyWeissman"] I'm going to try and build a Melquiades type amplifier (with some help from friends) following the advice given above to make it as simple as possible.&n...
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Romy, my experience with the Lundahl amorphous core transformenrs is limited to my new phono stage, and I have have been dealing other issues enough that I am not ready to write much about it yet.Still, there are qualities worth noting...
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[quote user="Paul S"] http://app.audiogon.com/listings/omnigon-full-function-tube-preamplifier-phonostageLooks like a serious effort that has been kicking around for a while.What tubes are used? Are they twin triode, like 12AX7 or - more likely - 692...
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Knowing your love of transient speed in transformers I think you would do best with a small Lundahl device. They are Per's pride and joy. If you want to skew towards information transform, with a slight "softening" of leading edge performance I can h...
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Hi Fellow Forumers,This is my first newbie post :-) Do any of you have any experience with running a Lundahl 1627 in a Full Range Melquiades with Avantgarde Duo Omega speakers?The other options are to get some custom Amorphous OPT's <50R 350mA 8:1...
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Hi Romy,I am studying your amp build. I see that for your 3 high pass RL circuits you have:Lundahl LL1531 Transformer. How did you connect this transformer so that it could be used as a 9.3H inductor? It appears to have 7 terminals 1H - what did you ...
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I use Sowter model 9550 for my treble horns. (Changing over to these was the biggest single improvement I've ever made). Brain is very good to deal with and will make anything to your specs. He has huge experiance with OPT design.Oneday I want to com...
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Romy,
Air core is ok, but. 1. Self inductance in an unmitigated field clumps. You can easily see this by unwinding a hockey puck style air core inductor and measuring the inductance with each turn removed. Never will you have the smooth loss of indu...
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[quote user="Antonio J."] but the builder thinks that performance wise it's better to use several smaller caps paralleled [/quote]
If he thinks this way then let him to do whatever he wishes. Still, I assure you that Sound of the Milq dose not deriv...
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Looks fine, Anthony. I am not sure what resonance frequency tells
you. Anyhow, a great advantage of your pipe topology for LF is that you will be
able to pile up as many drivers as you need in order to hit the desired
reference DB level. There is...
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[quote user="Paul S"]20W from a 300B? What? I missed that. [/quote]Actually then call themselves Moonoblocks, it means that they use 2x300B for channel, probably paralleled or in SET PP configuration like Audio Mirrors does it. Still it is pushy fo...
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Shawn, I wish I remember it. I am sorry, It was 20 years ago.
Lundahl had very good PDF files that described all mappings. If you look at the posts from this site I did described at that time everything I did....
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Both UB Horn roll off circa 130Hz in room. There are a couple of rough MDF boxes here that I knocked up from spare sheet a while back. Have not tested them specifically at the intended spot behind me but running around with a microphone shows those...
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Paul,I know the capacitance -- this is an analog of impedance of ordinary speakers.I also compare to known serious designs, like mentioned Blue Hawaii.The multiple taps on PS iron is to accomodate different output tubes. The "bypassed transformers" a...
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I have an anal fantasy of a full silver path from the cart to the grid of the input stage.This brings me to finding an ambitious silver wound SUT. There is Slagle who can make it,but I'm inclined towards amorphous/nanocrystaline core, so there is Lun...
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Hi Romy,I've forwarded your last comments to Luis (the builder). He's a technical guy and for engineering minded people there are some things that seem hard to understand, they tend to think that better measurable performance is more desirable than s...
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I bought the Lundahl chokes for L1 and was not able to us them and they were insultingly sharp. For the L1 you would need more henries and more DCR, the higher DCR will sound better and the “bad” and “cheap” Hammond chokes worked very fine. You...
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Ok, so should be burned in nicely. There are some theories around how mylar and similar interwinding materials (as used by Lundahl, if that is the OPT you are using) can need a fair bit of run in. This is more of an issue on eg input transformer...
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[quote user="AnonymousUser"]I am thinking of launching into building or rather having buitl by a techie friend a pair of melquiades. Could you tell me more about the cost of building a pair of these amps? then how do they compare to other amps? I mea...
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Since I know about a few ongoing attempts out there by different people to build Melquiades I would like to share with some of my observations regarding corrections, simplification and possible modifications of Melquiades amplifier.
Obviously you ha...
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It is not about the LCR phono as a concept – many companies manufacture the RIAA LCR constant impedance networks: Lundahl, Tango, S&B, Da Vinci, A-D, your Allnic looks like dose them as well. The LCR filter is not complex and any manufacturing ho...
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[quote user="Paul S"]So this amp would not have to deal with a crossover? One R and one L in the signal path, it looks like a headphone amp, maybe a dream circuit for a light piston, HF only, given no cap/coil load at the [ribbon] driver. [/quo...
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[quote user="KOTriode"]Romy, in the contrary, it is very unfair to compare my 845 amp with the 6C33C. The main reason is the 845 amp used the best output/interstage transformer available, while the 6C33C's output xformer is pretty good but far from b...
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Paul, thank you for your input![quote user="Paul S"]I think with the SUT the "dynamic" loading the cartridge "sees" may swamp the choice of wire metal. Once the loading is dialed in, silver might be nice. [/quote]Yes Paul, absolutely agree--the ele...
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