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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Hey Alex,Aside from the obvious swapping of cables, do you have any extra outputs in your preamp? Don't try any sort of splitting device...I did it once with very cheap cables and couldn't listen for more than 30 seconds. You could always...
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This is Romy's unit that he let me borrow.It does produce the cleanest electricvity I've heard in my system in over 30 years of trying.A new find last night: The one amp with the problem power supply transformer is buzzing at the same frequency as th...
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[quote user="PurePower"]The PurePower batteries provide power to the AC regeneration whenever it is required. That could be during a black out, it could be during a brownout, it could be for a fraction of a cycle it could be for 10 minutes. The simpl...
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Thanks for your generosity with your work.I have been interested in smps since John Camille mentioned he was working on a filament supply using smps. Unfortuntely he died before this was finished. This was twenty years ago when mentioning smps arou...
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[quote user="N-set"]And paralled drivers? May I ask why you wanted to avoid them but would accept paralled output tubes?[/quote] I would for sure avoid any paralleling, would it be driver or output. Still, driver provides voltage gain and output stag...
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[quote user="Romy the Cat"]... if it cost nothing to you and if you initially wanted to try PP3000+ then I do not know how that misfortune you had did changed your mind.[/quote]Well let's just say that I find the retailer's version of events difficul...
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Measet,The bearing oil on the RX-5000 should be replaced with a good low viscosity turbine oil, Zoomspark works well. When opening the bearing you will notice there is a steel thrust plate that will have a dimple on it, you can flip around and use th...
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Ok, so it took me awhile. I finally got around to doing a design around this tube, believe it or not, as a driver for a 2A3. It just seemed right. Bought some 60's vintage(?) Amperex "PQ" on eBay. Well, here's what it looks li...
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Romy, I probably have it wrong, but this "negative impedance" scheme sounds a lot like "Servo". If it's anything like this, then no, i have never seen this applied to mid-bass, but only to "subs". But how would a very small tube amp "control" a mot...
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Hi Romy,On my to-do list is a single ended version of the F5... essentially just the upper or lower half of the schematic, with a load resistor to opposite power rail (or perhaps a low DCR SE transformer) replacing the complementary portion.Alas it's...
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If i am not mistaken It seems Most High Power UPS in the market like APC or ABB are not good for high dynamic loads (high crest factor like Music signal) and the load transient response of these UPS is not very good at rated power. APC , ABB and ... ...
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Paul, I have used in the past standard double conversion units where I have converted the fans to quieter ones, and installed controls on their speed. There is generally substantial overhead on the cooling, and these things are designed to shut down ...
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[quote user="RonyWeissman"]This is one of my favorite topics. [/quote]I completly share this sentiment.There is clearly nothing nearly as important as the listening room itself and having the possibility of building a listening room from scratch is ...
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That's a tough one.... the 6528 is on par with the 6336 dual triode (30 watts dissipation per section) but is overkill for a couple watts. It does have a mu of 9 which is quite high for a large IHT dual triode. It should easily drive a 1K load,...
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I have written in past that for some mystery reasons my PP3000+, and I presume all other PP3000+, do adversely affected by switching power supplies in the feeding line. I have PP3000+ and older PP3000 and both of them works wonderfully, one on main l...
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Thank you for your answer.If I understand well, In purpose to do something realistic and good sounding. I should use at least 2 amplifiers (one for high frequencies and the GM-100 amp for low frequencies) with a tubes active filter at the inputs of e...
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Maybe you should get spectral data what your power supply secondaries look like in an case, my suspicion is that we have the exact same issues as with high order crossover networks when our power supplies have "high order" filtration. Maybe we ne...
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[quote user="rowuk"]Alex, I have a APC RT UPS which is a regenerator and UPS in one. I use it for on site recording as you never know what you get from the wall socket. Dimmed lights, PA and all sorts of other devices like air conditioning and refrig...
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But here it is. I made this monoblock fit into less than a square foot. It is tight. I use Hammond iron throughout. Their stuff usually works pretty good for power supplies. I have some photos at my blog. [img]http...
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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, not much power and...
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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="Chirag"]The 6E5P is an interesting device (I did some research after you dropped the "tetrode" hint and bought a few :-)), but the bias scheme with the OA2's is still incomprehensible to me. [/quote]Ok, I will try to explain.
The...
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[quote user="haralanov"] I will not call this excitement, let say it dynamic stability. [/quote]
Hm, the “dynamic stability”. This is a new objective…
[quote user="cv"] I suspect [David]he feels more comfortable with coils running at low vo...
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Thanks for your reply.
I have double checked everything and my VR1 is connected on the positive bias side. With the input shorted I get -4.2V on the grid and it stays the same after I unshort it and adjust VR1 to 0v. Yesterday voltage was dri...
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This morning I logged the mains power draw so that I can properly size the fuses.
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Ah, last night, after midnight I picked in McMaster-Carr some elements for my proposed Supper Melq rack. Thy shipped it UPS ground and I had it delivered that same day! How they do it? Anyhow, I connected two shelves with 4 x 12” by 5/8” rods. I tigh...
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[quote user="anthony"]To mirror your
obsession, but not as the instigator of the project, rather as the duplicator,
it has been my plan for some time to take off all of January to get my
Melquiades/Macondo installed in my room. Being self-employe...
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Yes, it would be very interesting to hear the difference between a 6C33C amp with and without tube regulation, but also they are too many thing to try too, ... the possibility is endless here.My recent experience with two different ...
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The Audio Fedirection guy got a new camera? I bet he did. Anyhow, the pictures are courtesy of Audio Fedirection blog.
http://audiofederation.com/blog/archives/271
As I said above - I was as queries to have a preview of that ML3 amp as I was wonder...
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I would like to offers some thoughts about possible avenues for Pure Power 2000 improvements. Those thoughts are no specific to the recent November-December events and have broader generic implication. I initially intended to write it to Pure Po...
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