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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Ok, I think I've finally vivisected my ham--it's connected to the rectifier switching (at least some part is).Below is the waveform of the loaded HT secondary (red trace) and the signal from a search coil catching the leakage flux close to the transf...
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[quote user="Paul S"]How do I hate DIY? Let me count the ways...[/quote]I hate it just as much! Paul, thanks, but most of what you are talking about has been already addressed and described. Perhaps not very visible frommy pictures but I'm a very poo...
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I've spent two more nights examining and fighting my ham (I'm vegetarian and I want my phono to be so as well).1) I did Romy's excercise with shorting the stages via a 0.47u cap to GND. Shorting the plate of V2/grid of V3 resultedin the biggest reduc...
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[quote user="Paul S"]N-Set, why would you disconnect from the house neutral, unless you are using battery power??? This "neutral" is the "ground" leg of your circuit! The house neutral wire is typically white, and the house ground wire is typically g...
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[quote user="Paul S"]If you can do it, try isolating both cases/chasses from your "ground plane(s)". Use one inclusive "ground plane" for both the PS and the gain/RIAA sections, and ground this "ground plane" to the house "neutral" wire. Do NOT conne...
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I did one thing: I swapped the phase of one of my PS transformers (the heater one).My PS transformers are placed parallel side-by-side and super close to each other. Very wise, but I had no choice. I tried to wire the primariesout of phase to have so...
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[quote user="Romy the Cat"]I think that you did not exactly my version but made some modifications; I do not know/remember what they were. [/quote]CCS heating of the tubes based on LT337A, 2x0.47u+470K at the output,my filtering is a bit bulkier at ...
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[quote user="Paul S"]Is the "ground plane" in this case literally a sheet of copper that you run all the grounds to? If so, this may be overkill on the one hand and an antenna/noise magnet/generator on the other hand, and/or it may well make for grou...
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The grounding I have employed is a mixture of a "local star" and GND plane (I've obviously copied it from the Cat).I did pay a lot of attention not to have loops. Here is my grounding scheme. I wonder if there are any obvious errors?There is a switch...
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I see the point, thanks a lot for your comments. Playing with the phono I've somehow come to a conlusion (possibly wrong) that my ham is an electrostatic air pick-up from the PS. During the operation both PS and signal boxes are very closetogether an...
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[quote user="Romy the Cat"] Well, you need to get rid of transformers and to make your phonocorrector to have no noise of any kind with any transformers. From MM level you need to have no more then 1-3mV AC at output and absolute not noise. After you...
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I'm slowly getting somewhere. Disconecting transformers did bring the ham down, but to my surprise not exactly to the level where it was before-it's unfortunately stronger. And all this after my heroic removal of Holcos from the grids of V2.The ham i...
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[quote user="Romy the Cat"]Yes, the layout kind of not optimum. You might try to lay the transformers sidewise and to make the RCA atop, above the transformers. Still, I hope you understand that your hum has very little to do with layout. Properly gr...
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...but for a different reason.After lots of traveling I'm finally back and continue my long lasting assault on 834.Pieter kept his word and the nano core transformers (both his MkII and a experimental pairon my yet bigger cores) are here. I removed a...
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Not sure about US, but here in EU small wind turbines next to the housesare quite popular.There are compact models, without 100m span of the propeler.Here is a random Polish DIY approach:http://wiatrowa.pl.tl/I personaly like it. If well done it's a ...
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[quote user="Romy the Cat"]I do not use the ionizers for my LP setup anymore. I find that it is very inconsistent as sometime it helps against dust and sometime it does not. What however, I did noted that if you use a powerful ionizer that can ionize...
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This code of Armen, 7H15 C0D3 0F 4RM3N, (I also think it's not very demanding--every reasonable teenager would break it easily) is a great toy-model showing the error correcting power of the barin-a continuous stugle tomake sense out of the sensoria...
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[quote user="Romy the Cat"]The real wet dream of mine, something that I would like to have but never went for is to have in the axis of the air caps a high precision step motor and a remote control that would allow me to modify the phono equalization...
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[quote user="twogoodears"]... ordered Gardzienice's disk ... at the end, as I'll sure give a fond and interested listen to your suggested disk - just curious - let me ask: did you own/listened to the HM's disc I quoted, by any chance? [/quote]Sef...
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There are quantum RNG's available, unbeaten by any classical RNG just by the physics of their operation, and you can have one for $200 or so ona PC card, but scooter I think that'sway too much. Just randomly stacking several available thicknesses sho...
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It's too late for Rakesh, but I'd use MDF of various thickness, randomly interchanged to avoid repetetive structures....
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[quote user="Romy the Cat"] A cap in put AC has no biased dielectric and as a result all dielectrics are vibrating (they are dielectrics but they are partially chargeable) and smear the termination of transmission line. [/quote]Hm...If taken outside...
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(feel free to re/move this post to the electricity thread)As the power supply I'd regard everything from the power generator in the power plant down to the actual load.Why the power transformer should be the cutting line? I do hear your voice clearly...
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This question had a second bottom so to say. In reality I was not seeking any suggestion: crocodile clipended leads and the chokes are bybassed in few seconds on the fly. Ripping the filters of would be another few minutes. I do have some spirit of a...
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[quote user="Romy the Cat"]1) Be very careful with use Halco resistors. They were very good 15 years back but they turned south very aggressively. I bought a party of Halco in 2005 and I forced myself to trashed them as they were very noisy. You...
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Here is the signal box:The design is double mono past the VR's. Including the bias.
The coupling caps are Arcotronics KP172 from RS-Online, quite prised by Thorsten Loesch. THey are sitting on
sorbothane pads. The air caps are: 1) 365pF some +/- s...
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Thanks guys! rakesh, I haven't seen different compounds from Geltec, rather the same materialin different forms: bushings, chips, tape etc. I understand your point with the air suspension, but that'snot gonna happen now. There are shock absorbing fra...
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[quote user="Paul S"]I envy those who can use a scope like Tarot cards.[/quote]I for sure cannot, hoping you can. That's why I spammed the thread with the above noise "traces"[quote user="Paul S"]Will you mount initial gain tranny (or, not...) outsi...
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[quote user="Romy the Cat"]N-set, The subject is that you look like enjoy spending time and efforts to built audio, so why don’t you get recruited by Rakesh and do what you do only get reimbursed for it. The Cat[/quote]...now it's more of a necessit...
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[quote user="Paul S"]No way to guess about grounding, at least until you show the final traces. I simply must use shielded inputs, and I bleed these "upstream" via a "dedicated" ground (and certainly NOT the "house ground"...). Yes, I realize this ...
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