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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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So, my two problems have been fixed, I think.First was the issue with the 6e6p for the HF Channel not being able to draw enough current. I checked the bias and it was fine and the potentiometer allowed plenty of adjustment so I changed nothing in t...
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I am always a bit hesitant to buy into "listening descriptions". I am a musician and am confronted every day with Sound bias - attraction to what we are accustomed to, expectations being confirmed. We are creatures of habit and modifying old habits i...
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[quote user="Romy the Cat"]I would certainly avoid a taper that all time runs across the wires of the transformer and constancy adjusts voltage. I do not insist that it is the best way to do the things but my experience with variac was not so encoura...
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Anthony, there is many areas for power supply
scaling down if you want to. You can put an extra 440V coil on your power transformer
that driver output stage and have PS for driver stage and perhaps bias. Do not
forget that this high voltage do not...
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Hi Romy,Minor question with hopefully a simple answer.In the DSET schematic you have a 12.1k resistor in the bias for channels B, C, D and F. I have some nice 12k resistors here (not 12.1k) that I could use in those positions...can you see a problem...
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I never had any fuses in my amp and never had any need for it. I have a fuse at my DHT channel as the tube is rare but not on the 6C33C. I do not really understand the problem you have with current. You have the meter that shows you current in real t...
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I used those VPI magic brick sitting on top of the transformer, my audio analyzer tell me that these bricks helped the noise by about 1db, may be the 6 lbs or so weight does damp the xformer vibration, so I leave them on, just trying everything to ke...
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N-set, I understand you do not mean to hijack the thread with the Axiom, so I actually tried to make generic and/or thread-related observations. I don't know the 6E5P, but generic issues with specific DC tank circuits and driver and output tube stab...
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There is no need to invent anything in the 834PT – it is good as is. The only think that I “might” do it conversion of the second stage to fixed bias and drive R18 resistor from 1.5V battery. Everything else is perfect in this corrector.
The CatCor...
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Hi Alex,I am sorry, what you claim can not be. No cap is going to separate bass instruments better.The brilliance of the 834p circuit is that the EQ also uses the miller capacitance of the tubes in a very brilliant way. The power supply caps are very...
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Dear Romy,I do not know who uses the PowerStation75 so I cannot say whether it is helpful. I use the Powerware 5115 UPS boxes for managing the mains power supply [details on www.nps.com.au under Products and Line Interactive UPS (Corporate...
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Amir, I have shared that I quite liked the (original) Audiopax amps I have heard. Whatever they claim, they do sound right to me. Although I have never played much with a de Lima amp I have played quite a bit with most of my own phono stages, pre-amp...
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Some time ago Romy threw me a fish in the form of two numbers, 280 and 185, meaning mV and V, respectivly, and I finally got around to chowing down. I was getting annoyed with the sound this morning to the extent that I busted ou...
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[quote user="Romy the Cat"]BTW, I have a local Bostonian guy have replied brought today a very interesting DHT amp. He has a number of DHTs and this one he reports is the special one, quite expensive as well. Although the electricity was not good tod...
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I can relate to your point about mating SETs with inefficient speakers. I guess since they don't sound overtly bad when they clip, some people feel they can be run with less dynamic headroom than SS amps require. The resulting compression probably ...
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Interesting Romy, particularly the "echo" affect and weird overtones with the aircap. I wonder if the thing is picking up resonances and if the impedance issue is responsible for the overtones... signal being modulated by the varying input capacitanc...
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One was the Llano Design Group's Trinity, which had 300wpc. The first stage was tube and was in a separated enclosure providing voltage amplification, while the second stage used transistors for current amplification. I guess it was pure cl...
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Oh, Romy, I meant the air caps in the corrector loop of course!!!Adjusting PS caps I leave to AA morons and alike.Believe me or not I did go very serious about the proper choke input operation.What I meant is that I have to get hold of a scope to che...
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London ffrr, CSA2216,; stereo LPI have always found the first movement of this symphony to be the most musically satisfying part of it, and nothing in the cited performance has changed this old bias. I have to give Solti credit here, however, fo...
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N-set, starting from reasonable input, the 6E5P can swing some serious voltage, and Romy also sings its praises in terms of sound. Maybe sim that, running it in its safe zone to a 6C33C. From there, you have all the power you'd want to drive -- what...
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It is not a the thread about Allnic but LCR RIAA correctors, still there was something expressed in here about the Allnic LCR phonocorrector… and I feel bad about it. It is not that I don’t think that Allnic LCR phonocorrector deserve positive m...
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Yes, I know about the 18dB click, the question is what it is. Do they turn an extra gain stage from 18dB to 24dB? Highly unlikely! Those SS circuits have a lot of gain and a lot of feedback to manage the 6dB is very much not a problem for them. I was...
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Referring to my very recent acceptance of the 6E6P as a tetrode to drive the tweeter:
http://www.GoodSoundClub.com/TreeItem.aspx?PostID=5329
I decided to today to stick my beloved 7721/D3A in place of the 6E6P – thanks God they have the same pins l...
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[quote user="KOTriode"] Thank you for the comment on this amp, this is my first time of using the 6C33C tube, I decided to build this amp after reading about the Melquiades, this amp is just a quick experiment on the 6C33C sound, since I have a s...
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The preamp has the classic tube regulated power supply using 5R4, 6AS7, 6SJ7. It is transformer coupled output and has no capacitor in the signal chain, the gain is about 8db, so it is not a buffer. For convenience, it does has a remote control. It i...
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[quote user="drdna"] However, the concept of the point source is absolutely valid. The audio reproduction should follow the transduction from the microphone, which is point source. We have to "play by the rules we make." [/quote] Well, let look into ...
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Scooter,You may be right. Harman is a big international organisation which obviously seeks to profit from its marketing effort as well as from research conducted and papers written by its employees. But call me naive if you wish, I do not agree with ...
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Righto then, I guess there is no reason not to try this, except that one of the original crossovers here is non-functioning (if I remember correctly), so if trialling in stereo I'll have to crossover in Melquiades. Should have the parts here to do t...
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Three problems with the Scan-Speak are the low X-max, the built-in response curve, and limited power handling. It will be interesting to see how you juggle these issues if you do use these guys for LF. Obviously, if you bias against the natural ris...
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[quote user="Romy the Cat"]I was thinking about this: how come that driving 6C33C (in fact driving anything one can imagine) the 6E5P was very fine but driving 2A3 it was dull like hell. I opened the amp and tested all – everything was perfect but th...
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