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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="IslandPink"]…. transformers being the big issue there as I see it ….[/quote]IslandPink, We are so accustom to sink inside the box of full range SET amplifiers that we afraid of everything. This is the whole beauty of DSET concept – the ...
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[quote user="George"]I have always been meaning to ask you why a step-up transformer for a cartridge can be acceptable but a transformer elsewhere is considered detrimental. [/quote] I do not say that step-up transformer is good but the transformers ...
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[quote user="Romy the Cat"]In my upcoming DH Milq MF DSET I will have an Innerstage transformer and output transformer. The loading of output tube has known effect to harmonics vs. transients, it is know, it is predicable and it is manageable. The In...
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I got today my first pair of output transformers for the single-stage Melquiades. They are 40ma, 5H, 42R primary, 15:1, Amorphous, with remapable secondaries made by Netherlandian Pieter Treurniet. I did not put it in use and heard them – proba...
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Further looking at where I would like to take the new 6-chennal version of the Super Milq I am contemplating a new revision of my bass channel output transformer. Currently I have Jack Elliano’s made 450mA, large, single section LF transformer that b...
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KOT, as you may know, the ML2 has a BIG transformer to make "36 Watts" at clipping; but even with this and the trick feedback it is not the first choice for large dynamic/OB drivers. Of course I mention this because of your remarks about the 6C33C, ...
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Does anyone have building and/or listening experience in "transformered" IU output DAC's (with/without tube behind it)?...
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Allo Romy,Big topic this! I will write something suitably detailed when I get a chance this weekend, but you're right - the transformer is key and one that is optimised for the task in hand is absolutely the way to go and something that not many peop...
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AlloT wrote: "Absolutely. Making a transformer for < 100Hz would mean to use a huge core and a fairly large airgap to get more inductance at a given standing current. This makes winding the transformer with low parasitic capacitance and low leakag...
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Mani, that is interesting. Instead of simply fixing the PP2000 you decided to try isolation transformer way. That is fine. Can you provide more details how you made your 15KVA isolation transformer? I have 3KVA and 5KVA they big, they have, the have ...
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[quote user="Romy the Cat"]Instead of simply fixing the PP2000 you decided to try isolation transformer way.[/quote] With all due respect Romy, you of all people know that applying the term "simply fixing" to the PP2000 is ridiculous. I don't have th...
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[quote user="Romy the Cat"]From what you describe I conclude that you have ground loops regardless of the PPs and the PP juts highlights the problem.[/quote]This may well be the case. I can't even remember the exact components I was using last year (...
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[quote user="Paul S"] I have been surprised that you have not already pursued the Zarathustra for your multi-driver, sealed LF. From your early descriptions of both, this seemed like a natural pairing and the most likely way to go, to keep the ...
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Alex, From what you report it looks like it might be the filaments. The 32mV is a bit high for filament ripple, I usually prefer it to be 5mV but 32mV shell not have hum. Do not bring the filaments directly as you did but make it running by tool loo...
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There should be an 111dB tap on the Lazy Ribbon, but perhaps you have tried that already. Other than that, perhaps talk to RAAL to see if they can improve the sensitivity a little more with a transformer change (or something else)...it might be quic...
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DA, from what you say I do not think you need actions to do now. As I understand the power transformer for the amps most likely has been made. Since you are in design phase and the look forward to have a sever voltage then get 1-2A 12V transformer w...
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Hi,[quote user="Romy the Cat"]
I lately have some reasons to think about optimum requirements for SET’s out transformer if the amp handles juts a narrows bandwidth. For instance let pretend that we have 2 monoblock and each of them drive: LF <10...
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Allo TAh, I think we are agreed on all counts. The suggestion of low bass via the deliberate introduction of its harmonics is something that has been done with guitar amps since way back, even if it wasn't the original intention...cheerscv...
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This will be very interesting indeed... that is an enormous airgap and will make for a very linear and unstressed hunk of iron. You may wish to apply similar tactics to the power supply (low DCR inductors) if you want to be really surprised...Which r...
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Hi.
Just remembering I am not technically capable to do any actual statement.
About the GM-100 I guess so. NatAudio has an amplifier using GM100 but with solid state power supply. Magma.
...
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First of all thanks to all who assist me with this project, including those who did not post here.
Jim, Electraprinted Jack is great guy but he does not believe in exotic cores, very unfortunate because I like to deal with him.
Jessie, you are righ...
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Romy,
I have contacted Automatic Electric (AE Europe in the Netherlands) requesting a quote for transformers meeting your specs. The AE site says they can do custom amorphous core transformers to spec. Currently waiting for a reply. I will post th...
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[quote user="Merlin"]Secondly could you explain which characteristics of the recording are destroyed, and what mechanism David Berning uses to acheive this? [/quote]
Actually it would be a reversed question to David Berning:
“What kind evaluation ...
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Meriln, this is one of the subjects that disturbs me in your description: your bring OTL consciousness to justify Berning and you bring all those foolish OTL people as witnesses to give credentials to Berning. We all know Doctor Gizmo and all know hi...
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I've read about what Sakuma does (as have many people) I've never listened to, or tried to build any of the amplifiers he publishes schematics for. However, I have made several amplifiers which use interstage transformer coupling and, provided ...
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[quote user="IslandPink"]…. transformers being the big issue there as I see it ….[/quote]IslandPink, We are so accustom to sink inside the box of full range SET amplifiers that we afraid of everything. This is the whole beauty of DSET concept – the ...
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I got new coils for my MF DH DSET output transformer. To read more about it: http://www.intactaudio.com/forum/viewtopic.php?p=4171#4171...
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Hi,From Pieter:"For me it is normal practice to do good specifications.
I go for 10 Hy's at 250mA.
10 Hy's with 512 ohms source impedance will give 8 Hz cut off frequency."BestDominik...
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You can gap it for 250mA or for 300mA – you still have some spare inductance. From what I see Pieter gave you a very good price for that chunk of core. If I decide to keep my “experimental” full-range SET amp (Sun Audio) then I will get from him a be...
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Domidaw, you wrote: The photo shows the capacitor c10. Its minus is connected to ground, its plus goes to the output transformer,According to the schematic it is the grounded (minus) end of C10 that should connect to one side of the output transforme...
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