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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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[quote user="Romy the Cat"] For above 550hz you might use the same LL1627A if you wish, for MF the 200-250mA gap will be fine. Yes it would be reasonable to desire less inductance in the transformer, mean less turns but honestly I personally did not ...
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[quote user="mmhifi"]I finished Joseph Flavius and don't want another Jews war here - so please - tone down my friend[/quote]
Yes, be careful, Romy, or you may have to ban yourself. :D
[quote user="Romy the Cat"]Anyone who has very rudimental under...
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[quote user="Romy the Cat"] gordan wrote: plus they IMHO sound better - less prejudiced towards a romantic SET sound we all know (and some try to avoid). Yes, Gordan, it is exactly what I heard about the 10s from the sources that I found rationa...
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Romy, That gets you where you want.. good transfer curve, low distortion and about 2.7-watts output. 2A3 should last a long time. One question and one comment:Question: the 0.75 ohm resistors in the filament lines on the 2A3. Is it your in...
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[quote user="Axel"] I was hoping to get some specifics from you when looking at a BEST "impedance match" ~ 1:1 with the cart in use, and if you had figured out some ball-park value which then can be used as point of departure for listening test.[/quo...
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[quote user="Ostblock"]Is there any technical reason that you use a 400V transformer to feed the driver tube?The plate voltage on 6E5P is only +200V. Therefore from my point of view, a 220-240V transformer would be enough.[/quote]Ostblock, you need t...
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This week I will be trying to address why the Milq midbass is clipping. This is very interesting one. Currently the Melquiades LF channel uses an output transformer 700R to 5R or 11.83 to 1. I thought before that I have much lower ratio, like 5:1 bu...
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Paul, what are you talking about? I use from my 6C33C no more then 1-2W. The 6C33C at LF might give 20 W but it is load over to 600R. I load it to near 2500R (11.83:1 transformer with 15R driver) – you figure out your how much power and gain I b...
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It is interesting: I am running now Zarathustra amp with my woofer towers, line-level crossed at 90Hz with fist order. Everything is very fine bass-wise, with very minute touch of dominating smoothness. To my surprise the typical upper-bass har...
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It was said in http://www.GoodSoundClub.com/TreeItem.aspx?PostID=3418
[quote user="Romy the Cat"]The HF channel of the Super Melquiades should be revised. Something is wrong in there and it does not sound as I would like to. It mostly relates to imp...
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Anthony and Romy, thanks for taking the time to respond to my question. I want to take on this project as a learning experience both in terms of simply building an amplifier from a schematic and for my edification on sound reproduction.
I’m starti...
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Looking again at the NAT Audio Magna amp, the amps around the 833A, GU81, 50TH, 1000TH, GM100 and many other SETs that try to use powers transmuting tubes I feel that the entire endeavor of powerful SETs shoot itself in a leg.
If a person has too de...
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[quote user="hagtech"]I have not tried this tube yet. It might push the limits of the tester. The 6.3V heater current supply is nominally rated at 5 amps. It might be ok to push it to 6.6 amps. I have to think about this, make...
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[quote user="Chirag"] It seems the 6e5p is driving the transformer directly. I've used various versions of even simple mosfet followers to good effect at the headphone level, but never considered using a speaker level transformer. Did you and D...
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[quote user="noviygera"] What does this mean?
Let's say the OT is 5K:8 where is this loading coefficient coming from? And how
can it be adjusted? If the R(e) of a driver is let's say 12ohm, does this mean
the secondary of the OT must be 12ohms for...
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[quote user="KOTriode"] With 6C33C output run at 40W plate dissipation, this amp run much hotter than an 845 amp with output tube running at 100W. I measured the hottest point on the bulb and it is about 380F. I guess the due to short bottle , t...
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[quote user="rowuk"]I have experimented
with SS/SET and now DSEP for ceramic magnet horn drivers. I will agree that
ceramic drivers with SETs that I have heard being suboptimal, but after a year
of DSEP, at least for my use case, I am quite conten...
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[quote user="Paul S"] The "calm HF" effect is something I have long sought but seldom experienced from repro, and I have blamed the amps as much as the ribbons. Mere HF extension is not enough. Hard to say whether the amp or the rib...
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It's 60Hz hum, caused by both mechanical and magnetic field coupling to the output transformer. I used a toroidal transformer and thought it would not caused this problem but it did. When using an external power supply for both ...
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[quote user="son"]Its very clear right know,so i decide to build with 12,6v in series….[/quote] Son, when I proposed the series configuration I thought that you have already have an amp and would like to convert it to single plate configuration. Howe...
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I detected that the Water Drop tweeter has VERY interesting ability to react to the stage of out stage. I am driving the Water Drop with a full range Melquiades SET. As you know the full-rage Milq use a moderate Lindale transformer with a juts 200mA ...
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Romy,That upper rolloff in the OPT comes from a number of distributed capacitances and leakage inductances in the transformer - it will not be a simple filter. Lots of transformers have weird resonances up at the top of their range. In fact, some mak...
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Hello Mani,I am using a 10KW balanced transformer on my system with dedicated earth just as you are, I use two 110V power lines to enter making it 220 volts on the primary and get 110 volts on the secondary with the earth. I have a rod in the garden...
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Paul, I think you missed the entire rational of my post. It is OK, people hear what they want to hear. Anyhow juts one correction I would like to make. I did run the ML2 with generator and scope at full power. I had 21W at 19-20Hz. It was not even wa...
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[quote user="Bud"]Sounds to me like your switch mode transformer is doing the buzzing... There is always a turn on buzz, but just for about 10 seconds. The original one had a noisy fan also, to keep it from self igniting, perhaps that is your actual ...
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(sorry, this is supposed to be posted in the questions and answers colume but I must be so stupid to have it posted here and now I don't know how to move it there.)Hi Romy,How are you! This is Welborne, from far across the ocean, Hong Kong. I have k...
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Iraschwips, sorry did not see your post. Anthony is basically
right, it does not matter for this specific application of you have center tap or
not. It is also not really important if you connect filaments on 6C33C in series
or parallel. There is ...
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[quote user="Romy the Cat"]The guy who did my Expressive Technology SU2 transformer after he heard my pontifications the silver is bad told me that there is some silver in my transformer. He did not go into details and I think as now the “secret” wil...
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Yes, I understand Bud that anything might be done but I do not want any DIY solution. To deal with all of the shielding, with grounds… I do not want to be involved into all of it. Also, the transformer shall sit at the RCA exit jacks of phono cable. ...
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Here is the general specification for the parts that I used. The selection of the parts implies some liberty of course. It will be your amp after all, not mine - do whatever you wish. In some case when I feel that requirement is critical I will stres...
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