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Read the Post in new Window Read the Post in Threaded view  Post #26: Tube current measurement by deemon on 2022-01-03 
Browse the content of the threads in new Window  Thread: R22 in Melquiades Amplifier  34 Replies 
Hi Domidaw ! The first thing that we need to find out - is a REAL tube plate current at the moment when the R22 resistor starts smoking . I mean not a calculations that might be based on some faulty conclusions but a real current that an ammeter does...

Read the Post in new Window Read the Post in Threaded view  Post #49: Direct-coupled amp by deemon on 2010-11-05 
Browse the content of the threads in new Window  Thread: To drive the 6C33C... in Melquiades Amplifier  65 Replies 
[quote user="manisandher"]Hi Dima,Do you know if this is similar to the approach Tim de Paravicini took in his direct-coupled amp placed inside a Quad? I'm currently using Quad speakers (I gave up on the horn approach through sheer frustration) and i...

Read the Post in new Window Read the Post in Threaded view  Post #46: OTL electrostat amplifier by deemon on 2010-11-03 
Browse the content of the threads in new Window  Thread: To drive the 6C33C... in Melquiades Amplifier  65 Replies 
Yes , I told Romy about this funny idea , which is quite simple of course - to make a simple SRPP stage on special hi-voltage tubes , powered with high voltage supply ( 10000 V , for example ) and drive the electrostat panel directly from the output ...

Read the Post in new Window Read the Post in Threaded view  Post #343: The possible cause by deemon on 2010-10-02 
Browse the content of the threads in new Window  Thread: Macondo’s Midbass Project – the grown up time. in Horn-Loaded Speakers  455 Replies 
[quote user="Romy the Cat"]I mean the driver from 14Hz to 150HZ gas absolutely linear impedance as it has no active load. I look at all of it and felt so tiered and I walked out if it. I think in the new room the horn is shooting into the wide open s...

Read the Post in new Window Read the Post in Threaded view  Post #7: Good idea by deemon on 2008-11-27 
Browse the content of the threads in new Window  Thread: Dynamic viscose stabilization of turntable’s platter. in Analog Playback  14 Replies 
+++++++Pretend that we have a good mass platter and this platter in addition it it’s mass has a large circular chamber near the outside skirt. The chamber or the channel is 50% filled with some kind of heavy liquid.++++++++Good idea , Roma ...

Read the Post in new Window Read the Post in Threaded view  Post #16: MR67 by deemon on 2008-08-23 
Browse the content of the threads in new Window  Thread: A tube tuner? REL Precedent 646C in Off Air Audio  24 Replies 
Hi , Wojtek !Of course , I have some ideas how to modify this tuner , but before doing it you need to check if it operates correctly ! I mean tubes health , power supply operation , DC voltages on testpoints , LC tanks alignment , etc . You see ...

Read the Post in new Window Read the Post in Threaded view  Post #43: Fixed bias by deemon on 2008-06-04 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
Do you mean a battery bias , Brian ? We didn't try it because of 1 V bias voltage - I don't know if the battery with this voltage does exist . I know only 1,5 V and 1,2 V cells ...... maybe using some chemical reactions we can obtain 1 V or little le...

Read the Post in new Window Read the Post in Threaded view  Post #38: SSG by deemon on 2008-06-04 
Browse the content of the threads in new Window  Thread: The last phonocorrector: “End of Life" Phonostage in Analog Playback  310 Replies 
Brian , I never tried SSG cap in phonostage . SSG has a good reputation ..... but I'd prefer teflon for coupling . Mica caps , even good ones like SSG , seems too "bright" for me , but teflon sound pretty neutral ....

Read the Post in new Window Read the Post in Threaded view  Post #11: Bias by deemon on 2007-08-14 
Browse the content of the threads in new Window  Thread: The Melquiades bass channels: the coupling capacitor. in Melquiades Amplifier  11 Replies 
Hi all ! I thought about this resistor bias idea that Chris proposed , and found some some problems here . One of them discovered Chris himself - it is a big serial resistor in the grid chain , and it can cause not only HF rolloff ( it isn't a big pr...

Read the Post in new Window Read the Post in Threaded view  Post #3: Misery or misunderstanding ? by deemon on 2007-02-12 
Browse the content of the threads in new Window  Thread: Metaxas-Wolfson ADC with Sound Devices SD744T in Didital Things  2 Replies 
[quote user="Romy the Cat"]I would live aside the technical aspect of the Kostas’s demo above and would like to point out other thing. I find this classical trio playing their rendition of Led Zeppelin’s “Stairway to Heaven” was very illustrative. Su...

Read the Post in new Window Read the Post in Threaded view  Post #31: Thermal hysteresis by deemon on 2007-01-24 
Browse the content of the threads in new Window  Thread: Get, or made up a tube tester, it’s necessary in Audio For Dummies ™  44 Replies 
Hi Jim ! You wrote about "hysteresis" in the 6C33C curves - it seems to be a very interesting point ! Maybe Romy told you about one fault of this kind of tubes - some old ones have a bad tendency of "thermal breakdown" . I mean positive thermal ...

Read the Post in new Window Read the Post in Threaded view  Post #17: Time delay by deemon on 2006-09-12 
Browse the content of the threads in new Window  Thread: Evaluation of tractrix curves based on visual surface reflec... in Horn-Loaded Speakers  17 Replies 
Yes , the idea of time delay machine is completely clear now . I made some experiments with analog and digital parts of the circuit , ewerything OK , and I need to assemble all the parts together , but now I am finishing the new hybrid class A amp - ...

Read the Post in new Window Read the Post in Threaded view  Post #6: Re: Here is where the key of High End by deemon on 2006-06-02 
Browse the content of the threads in new Window  Thread: High End Audio and musical content. in Playback Listening  8 Replies 
[quote user="Romy the Cat"]  Gregm wrote: There is where the entire purpose of Serious Audio is hidden, from my point of view. “Better Audio” is an active filter that incentives a listener with his/her listening experi...

Read the Post in new Window Read the Post in Threaded view  Post #7: Re: My very different objectives by deemon on 2006-02-22 
Browse the content of the threads in new Window  Thread: Driver tubes, grid leak biasing, and fidelity in Melquiades Amplifier  7 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #19: Re: VR tubes stability by deemon on 2005-09-10 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
Hi Jack , it's very interesting ! [quote user="Jack 14"]When I was younger -35 years ago-, I have observed the glowing of a NEW VR tube (it was a 0C2) for few hours (ok, I had nothing more interesting to do then..) and seen that at low currents,...

Read the Post in new Window Read the Post in Threaded view  Post #15: Re: Help to identify 0A2 tube. by deemon on 2005-09-09 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
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 :...

Read the Post in new Window Read the Post in Threaded view  Post #13: Re: Help to identify 0A2 tube. by deemon on 2005-09-08 
Browse the content of the threads in new Window  Thread: Gas voltage reference 0A2 tubes. in Melquiades Amplifier  42 Replies 
[quote user="Jack 14"]Hi, these ones are Russian military stock: see that no mica elements have been used in their construction, like the US Bendix Red Bank tubes (used in US ICBMs of the '50's-'60's). Old Soviet ICBM spare stock ?[/quote]It's v...

Read the Post in new Window Read the Post in Threaded view  Post #14: Re: “A” sound from “B” system? by deemon on 2005-08-04 
Browse the content of the threads in new Window  Thread: “A” sound from “B” system? in Audio Discussions  13 Replies 
Hi all ! [quote user="morricab"] Hi Romy, Could you explain a little more about the amp?  If I understand you correctly it is a 1 tube stage with solid state (Mosfet or Bipolar??) output.  If it is Mosfet then it is likely to be running w...

Read the Post in new Window Read the Post in Threaded view  Post #9: Re: Dima’s Amp: the first blood. by deemon on 2005-05-24 
Browse the content of the threads in new Window  Thread: “A” sound from “B” system? in Audio Discussions  13 Replies 
[quote user="Romy the Cat"] BTW, I think Dima has a Real name for his amp. I hope he would show up in here and would let us know it… The good thing should be referred by own name… It really deserves it.[/quote]OK , being inspired by Romy's Mel...

Read the Post in new Window Read the Post in Threaded view  Post #35: Re: My privet public SPU disaster!!! by deemon on 2005-05-14 
Browse the content of the threads in new Window  Thread: Tell me about more about Ortofone SPU Sound. in Analog Playback  54 Replies 
[quote user="Romy the Cat"] I juts got home, put a record to play and suddenly discovered that my SPU has it’s cantilever bent 90 degree and then even twisted vertically. It was perfectly fine last night!!! I have no idea what kind forced what appl...

Read the Post in new Window Read the Post in Threaded view  Post #4: Re: ....just purely fishing. by deemon on 2004-12-20 
Browse the content of the threads in new Window  Thread: Crossover or non-crossover help need. in Horn-Loaded Speakers  11 Replies 
Of course , if you need low pass , the chamber won't help .... but in seems to be that there are no good solution in this case . Too narrow bandwidth , and it will sound like a barrel :-) . Dima...

Read the Post in new Window Read the Post in Threaded view  Post #2: Re: Crossover or non-crossover help need. by deemon on 2004-12-20 
Browse the content of the threads in new Window  Thread: Crossover or non-crossover help need. in Horn-Loaded Speakers  11 Replies 
Hello , Roma ! I think that you can use only a back chamber with decreased size , and a serial capacitor . I think that there are no ways besides  ... Dima...

Read the Post in new Window Read the Post in Threaded view  Post #27: Re: Phonostage "Aulasaulalaraula". by deemon on 2004-12-08 
Browse the content of the threads in new Window  Thread: Where are our good phonostages? in Analog Playback  61 Replies 
Ha-ha , Roma , it is very good ! ;-) I will make a good copper plate with this name and attach it to my phonostage ....... ;-) Dima...

Read the Post in new Window Read the Post in Threaded view  Post #23: Re: It is fun! by deemon on 2004-12-08 
Browse the content of the threads in new Window  Thread: Where are our good phonostages? in Analog Playback  61 Replies 
Hello , Roma ! And what is the name ? I wanna make a label on my unit :-)...
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