Unboxing a double C core Single Ended output transformer!!!
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- Опубликовано: 20 июн 2024
- 8K primary, 4-8-16R secondary, 55H primary inductance, 20W amorphous core from British re-used 8C core material.
Hopefully this link will take you to the source:
www.aliexpress.us/item/325680...
About time for a RUclips title that truly embraces the platform's legendary traditions - you know, the clickbait, the outrage, and that irresistible blend of contentless, yet wildly popular dipshittery. Brace yourself for an opening shot that's as disconnected from content as it gets! Surprise - surprise, find ACTUAL HELPFUL CONTENT that will take you to the next chapter in you audiophile journey. ENJOY! 🚀
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Greetings, János
I'd like to learn more about transformers in crossovers. I've heard they're better for high frequency XO especially with silver
Hi Janos. I missed the video where you asked people what they would like to see covered in your videos. I would personally like to see a detailed set of instructions on how to build a Darling Amplifier(not the Baby Darling). The video you made some time ago on the Darling build at certain parts of the video you seem to rush over with the details of the build. If you can do another
video on this build more comprehensively it would be appreciated. Thanks
Hi Janos, yes once you found something on Ali express, never be complacent and think you will find it again. I always leave the tab open and use a separate browser page. Any way, I am looking forward to your videos on the result. I guess the cats have to patient to get their next buy me a coffee snacks.
Easiest way to save them is to click the 'like' so it goes into your wishlist...
@@EduardBroekman You might have a point there 😊
Nice find!! Are these 8Ks really 55H? I'm looking forward to hearing what you think of them! My guess for you Janos is that you won't miss the 'sluggish' iron-core sound after you've had these, but we'll no doubt hear how your ears react to these :)
I love the sound of these high nickel cores especially when wound like you have there (no plastic mould). People considering these need to keep an eye on having more than enough inductance for the tubes that you plan to run these with, and that's just because I think this core material saturates earlier than iron cores. For example I'd go min. 26H for a 300B.
I think they are 55H... at what frequency, that's another matter :) I also got their smaller single C core 10K:16R/8R, and put in into the DC Darling driving the Voigt pipe with the Cube audio, and they are outrageously good, they deliver the bottom end with excellent weight. Took a while to break in though, until then there was very little bottom end. Courious whow these big guys will do. Will cryo them first, though : )
Hopefully the 20W core will give enough headroom. Although the amp will be able to swing about 10W, but I will use it with well under 1W at most of the time.
The past week I've been running it with the AOs (with the old iron, putting out 1.2W pc), and I never use it at max volume, even though they are only 91-92dB/Wm. I've had a rough week, have not had a chance to respond to many of your emails or do anything audio....
@@realworldaudio I hope this week will treat you a lot better :) Great to hear you like the small dual C am cores; they're superb value and outshine my non-AM Lundahls so far it isn't funny. AE didn't list the inductance for the 8K model so it's really good to know and 55H is excellent for a whole range of tubes. I think they usually list inductance at 100Hz .. so far, my own measuring matched the 'sticker' inductance (via LC resonance) but I've got limited accuracy on measuring capacitance.
Very nice, Janos.. I just acquired Finemet C-cores from a friend a week ago.. About around the same size of an ST70 opt for a double c-core opt when they get wound.. So not really big, and would not be ideal for 8W 300B amps and the like.. I know a competent winder who could layer wound ‘em (no bobbins).. I’m just still not sure what project to use them in one day.. I have a quad of 45’s, maybe those would be nice in PP or PSE? What output tubes would you suggest?
Wow, those are fine cores! I'd recommend PP 45 ; ) 5K primaries.
Congrats on the purchase. I look forward to hearing the results. When changing output transformers, are there any other changes to the amp that need to be made? I've heard that any feedback needs to be adjusted when changing output transformers. If so, can you discuss that at some point? Thanks.
Yes, when there is feedback around the OPT, then it will change when primaries / step down is/are different. However, in most cases you want to replace with identical impedance OPT. My case here is special because the current OPT is not matched to my current speakers, that's why I am changing the primary / secondary. (Actually, I am changing the primary because they did not have 10K... only 8K.. sigh... not most fortunate). I have no feedback, so no adjustments tehre. However, even when there's feedback, I would suggest to leave it as it is, have a listen, and only then adjust the feedback. This way you will learn how FB voices the amp, and that it is not a tool that works the best when you get 0.0001x% measurements, but should always be used to voice to your listening preference.
I found them and many other similar ones quite readily when I looked at Ali Express.
That's the thing with Aliexpress. You will find them easily, maybe 8 times in a row, and when you want to order then you might not find it at all. Happened to me MANY times.. now when I find something interesting, I always bookmark it. Or, find something really close, and after you ordered it you find something closer to what you wanted...
@@realworldaudio Yes, a real lucky (or not) dip....
Nice video, but why don't you do the unpacking on a table? The camera focuses on your eyes. Thank you for the explanations.
Good tip, thanks! Indeed, cannot beat the camera autofocus.... it knows better what it wants to show... :)
Hi Janos, I looked them up and my settings on Ali Express are German language. But therefore I get additional information that I am almost sure you have to do without. Did you know that these transformers have "more charm than expensive cows"? 😎
I did not know that these transformers have more charm than expensive cows! I always learn something new :) :)
Curious how they transform the sound quality of your amp. Do you have any measurement tools to run some frequency sweeps with? Curious to see how they effect the frequency output of the amp. Skunkie Designs has some very informative videos on RUclips looking at the quality range of transformers. And synergy is key. There is no driving an 80dB 3ohm speaker w a 2W SE tube amp. Nor, is it a good idea driving 105dB horn speakers with a 300W class A SS amp. My 30w PP EL34 amp presents at an equivalent SPL as my 30w Class A SS amp when driving my Cornwalls. When driving any of my various single full range speakers, they also present with similar SPL.
There are really two types of amps. SE and PP. Then all other amps fit into sub categories of those. Speakers will have a few options within those subcategories that will be a suitable match from a technical standpoint. Within those matches, there will likely be one that one will prefer from a subjective standpoint.
Yes, I have several scopes, but the super sensitive one needs repairs, so I could only test the bandwidth and high power clipping. The bandwidth measurement is quite useless, as you can also hear it - if it's higher bandwidth you hear it as well, nothing gained. Transformer manufacturers provide the bandwidth graphs, so not much benefit here other than seeing how accurate the provided measurements were. Testing clipping - now that's something that's not very practical, as the volumes are excessive, and there's risk to damage the speakers. Yes, speakers - as measuring clipping with a resistor is like measuring a swimmers performance by making him do push ups instead of asking him to swim.
The biggest difference that's going to impact the voicing of the OPTs in most cases is at the low signal level. That requires very expensive gear to measure. My big Tek could do it, but it needs serious repairs.... will be a monstrous project in itself to fix the scope...
@@realworldaudio Elliott Sound I believe has some kind of calculator that can provide one with a schematic of a speaker driver simulator? Going by memory…. I find the clipping point to be of interest as it will will let you know the useable output of the amp. Which can matter a great deal if running a 1626 or Type 45 tube. There are so many benefits to better transformers!!! Looking forward to seeing how these perform.
Thank you! For the Ampex I did a frequency sweep (with a resistor load - limiting but informative to a degree) to see how it responds to being pushed. My method to test is very simple - I use square waves, and see how the square waves are amplified. (Square waves are essentially sine waves with infinite distortion, hardest thing to amplify properly - a very hard test.) I look first to see no overshoot / no ringing, and see what is the power level where I start to see it creeping up, showing that OPT or the tubes are stressed. With my Ampex there's no transformer clipping up to 20W output, and the square wave is clean. Above 20W I start to see overshoot and ringing appear, and there's no signal amplification beyond 60W. Pushing it beyond 60W yields only added distortion but no increase in signal. In my experience this is a very practical test, and informs me much better of how the amp will behave when pushed compared to giving a specific %THD value at an arbitrary power level, that tells nothing about which checkpoints have been reached (PSU overload / tube overload / transformer overload).
@@realworldaudio Agree! The three things I consider when looking at “measurements” are how a square wave is handled, at what power does it clip and what type of distortion happens at what power - even or odd ordered harmonic distortion. And you are correct that a basic 8 ohm resistor does not paint the full picture of how an amp “behaves”. But, we need some kind of standard reference for measuring standards. How the amp reacts to the dynamic load of a speaker kind of defines how they work as a synergistic system.