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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Gera,
tuning the amp loading is a tricky part. If you deal tube that you do not know
and the driver that you do not know then there is no way for you to know the
entry point into the game. I think the best way in this situation is not use
what pe...
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Well, I used "you" in an abstract rather than direct sense ;)Its very starange what you say than any power tube can be used - each power tube has its own drive requirements and making auniversal driver able to drive say 212E and eimacs is hardly poss...
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Nope, the Russian tubes generally much, in fact much worse than western equivalents. There were however some exceptions. Those options were due to various reasons. The tubes like GM70, YO186, 1P24B, 6E5P, 6N30P, BO188, GM57, UB180, 6C33C, 6N6P, M...
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I have some theories...*please* keep this tube safe, we will have to run some curves on it...More importantly, it's a good thing the output transformer wasn't damaged, though I'd imagine the tube would have struggled to pass more than around 600mA an...
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I probably overwhelmed the readers of my site with the different aspect of the 6C33C but it is what it is. This site is my diary and reflects what is going on with me in audio. Here it comes… now I am frustrated to understand the 6C33C.
The next mys...
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[quote user="ml8"] If you think gas regulators make sound of 6E5P so nice, didn't you try putting gas regulator tube in the grid of the 6C33C, and why? [/quote]
Sure, I trued. It sounded very bad. I pull out of my butt any imaginable rational with e...
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I don't remember exactly how yours were placed, but - while we're on the subject - it is considered good practice to put the magnetic axes of proximate transformers at right angles to one another. It's also good practice to attach dropping resistor...
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[quote user="Johann"]Hi Romy,i want to use the 6E6P-DR (triode mode) as driver in my tube 45 amp.I use a D3A (triode mode) with Anode choke at 180V, 12mA. Grid 2 is connected via 50 Ohm resistor to anode. Grid 3 (pin 8) is connected to cathode.Th...
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After burn-in the heater for 24 hrs, I tested all 3 Golden grid tubes on a bench power supply , 2 of the tubes worked fines, 1 tubes does not have current. The tube seller gladly refund for the non functional tube.I talked to a 6C33C OTL amp manufact...
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One of my YO186 have developed a dark eye on it’s getter. Even the tube still measures fine and sound fine but I wonder what make some of those tubes to get dart spat of the getter gloss. I have seen it before and do not have any association between ...
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For instance one could use this Eico preamp from the early days of stereo to get the center and Hafler surround channel:https://skyfiaudio.com/products/eico-hf-81-hf81-vintage-tube-integrated-amplifier-fully-restored-1960s-magic...
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Rony,
Actually I did try to drive Melquiades from different source. My old tube buffer, my phonostage and any other not DC-coupled source were not able to drive it. The 6-ch Melquiades is pain in as to drive. It has around 5K input impedance ...
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Romy and Paul,Thank you for your help and comments. I decided to move the amp on the floor and on its side so as to be able to monitor it during operation. As it had worked for 10 minutes after replacing the fuse, I was confident nothing sh...
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I have improved Minidsp 4x8.A class Solid state amp (HF)Single ended tube amp (mf)push pull tube amp (MB)Crown macrotech (bass)All amps build by AL Electronics, specially designed for me....
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I do not want go for emergency ULF amps and to pay more than $50 for it, in fact all plate amps shall cost $50. I will probably end up getting another B2 amp, identical to the one that blew up with the identical changes. I just felt that this no-ampl...
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Well, I normally use tube rectifier with my LC filters and, I don´t know exactly why, I haven´t had ringing problems at switching. I think could be tubes switch in a gentler way than silicon. I recommend you use an appropriated snubber circuit across...
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[quote user="AlexBerger"]Hello Romy,
What brand of 0A2 do you use in your phonostage?I used RCA, but after 1.5 years of work it began to spark when phonostage is switched on.I tried Siemens, Mazda and now Sylvania 0A2.Siemens has "disco sound"...
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Hello Paul,The first stage is a pentode, so the Miller cap is negligible. As for the other things you mentioned, there is a detailed exploration, which covers some of your points, by Dave Slagle at:http://www.intactaudio.com/forum/viewtopic.php?t=102...
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Good people,Has anybody tried CCS heating of the tubes here?That idea +/- makes sense to me (more with DHT though)and wanted to try it, but perhaps somebody has already been there? I'm thinking of 3 individual LT337 past the last reservouar caps, CCS...
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Grid leak bias is not reliable itself . Grid current is very low and grid resistor is very big , the circuit become very sensitive to all destabilizing factors - capacitor leak , humidity , temperature . And when we apply a big input signal to t...
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Hi Romy,Thanks for your response! I have never tried grounding the cathode in any of my tube projects. Even my amp output stages have been mostly cathode biased. But I am going to try grounded cathodes (and the +/- input stage supply) in my next amp,...
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Hi Jack ,Thank you for your very educational info ! It looks like you are right , and your tubes are rebranded SG13P .... Maybe a big stock of those tubes were exported , and you know them better than we do :-)And another question . You wrote :...
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I actually read the review carefully.
My initials sentiments were very accurate. Knowing the Vladimir’s reaction to those thighs I might presume that he also feels that this level of “intelligent writing about audio” is no more intellectu...
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It look like the project progress well. I have a little concern
about heat the will be building up in your PS enclosure. I do not know what
kind ventilation hole you have in there but be advised that it will be quite
hot. In worst case you mig...
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Last weekend, just for fun, I brought the amp and preamp to the 2011 Burning Amp in San Francisco. On the first speakers, the Audio Kinesis, I let the heater warmup for about 15 min, and then switched on the power, the amp was fine, we played...
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I assure you that my experience has very little meaning to others as I do not look for “better tube” but look for a tube that would go the best in my specific DSET application and in very custom application of Macondo MF channel. Also, a local gu...
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Go for a split bobbin unit for each tube. I would say that you will be very pleased when you dedicate a trans to the tube you choose. Less RF and strange coupling effects.I didn't notice the implementation earlier but can easily see some issues creep...
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Why do you think I bout a 1000 of them and closed to the rest of my life my interest in driver tubes?
Still, the 6E5P should not be measured as a driver but heard as a driver – the beauty in this tube is in its sound.
I do not know why it gave to y...
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[quote]very short tube, shorter then it should be[/quote]Hmmm, I'll have to double check. This is actually one of the tubes you sent me. It is a little taller than a 6H30. I bought a bunch more off of eBay but haven't fired them up ...
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Wait a minute ... will a choke input work with a gas tube as a load? The choke-rectified input is designed to work into a resistive type load, but basically acting itself as a voltage source, capable of psuedo regulation over a wide range of lo...
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