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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 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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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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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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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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I decided to try build amp by myself but I will need some help...
First, the parts...
1. OPT transformers- I posted mails to:
Tribute, lundhal, intactaudio, ae-europe, and today to promitheusaudio
I ask them for transformators that Ro...
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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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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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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="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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[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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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 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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Oh I read your post again, the AE-Europe transformers were another example of large amorphous that I probably wouldn't need...the lundahl's are available here in france and they are expensive at all, I'll probably get those. thanks...
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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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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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[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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Hi!
Stefano just made me aware about this forum, so I registered. Interesting thread about LCR RIAAs, one of my favorite topics :-)
About the gain of the WE437 phono: Since Stefano wants to use external MC step ups, I designed the phon...
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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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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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Since the “Hunan Style” phonostage-chasses is coming to me and will host my 7788-7721 (64dB) corrector (that I love) I was wondering where I can get an extra 10-20dB to run .2mV cartridges. You mentioned the Lundahl “amorphous core” transformers...
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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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I found an interesting flow in the sound of my current OPTS and while it will be certified I am experimenting with park of amorphous core transformers that left over from my former projects. I am trying to remap my Tribute but it is just 40mA. It...
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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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[quote user="nl"] Gordon Rankin of Wavelength Audio did a series of one-stage DHTs with a step-up transformer input about ten years ago. I think they were called the Mercury series. By all accounts, they sounded good, but of course had limited gain, ...
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[quote user="Tax"]The other options are to get some custom Amorphous OPT's <50R 350mA 8:1 as per previous posts, or to possibly pair Romy's LF tributes (for sale section) with a pair of Lundahl's in a two channel DSET configuration. The Avantgarde...
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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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You are correct about the load matching, for the Super Mild LF channel a half-Ohm of loading change bass quite dramatically. Still, the idea was to make this SET completely without any intentionally implemented feedback. It is juts not necessar...
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