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Read the Post in new Window Read the Post in Threaded view  Post #11: High transconductance saga... by Romy the Cat on 2004-10-03 
Browse the content of the threads in new Window  Thread: Where are our good phonostages? in Analog Playback  61 Replies 
Brain, C’mon, I was kidding about the “Electron Intensification Interface”! There is nothing in this phonocorrector then a correct selection of tubes, thier proper (well almost proper) use and selection of the specific topological decisions that sold...

Read the Post in new Window Read the Post in Threaded view  Post #25: The Alnic’s Preamp Mystery #2 by Romy the Cat on 2009-10-27 
Browse the content of the threads in new Window  Thread: The LCR RIAA correctors in Analog Playback  57 Replies 
[quote user="Romy the Cat"] 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 phono...

Read the Post in new Window Read the Post in Threaded view  Post #35: The "art" of buying high transconductance tubes. by Romy the Cat on 2008-01-19 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="hagtech"]Romy, you were right.  I just got in another pair of 7788 from eBay.  This time, one tube has a little bit of microphony, not bad, really.  The other was dead quiet!  No ping at all.  Very impressive, th...

Read the Post in new Window Read the Post in Threaded view  Post #3: 7788 - love the tube! by Romy the Cat on 2006-02-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="rafaroxlm"]As you may know the 7788 is a high transconductance pentode which should in theory be able to give higher audio resolution than say 12AX7, 6072 tubes in tube mic pre designs.  On search here the 7788 was mention...

Read the Post in new Window Read the Post in Threaded view  Post #3: 7788 - love the tube! by Romy the Cat on 2006-02-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="rafaroxlm"]As you may know the 7788 is a high transconductance pentode which should in theory be able to give higher audio resolution than say 12AX7, 6072 tubes in tube mic pre designs.  On search here the 7788 was mention...

Read the Post in new Window Read the Post in Threaded view  Post #4: Re: 7788 - love the tube! by rafaroxlm on 2006-02-15 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Thanks for the comments Romy.  Would appreciate pointing out where the schematic is for the 7788 phono preamp or even better your friend´s 7788 mic preamp schematic.  I can use the phono stage circuit minus the RIAA as a starter and th...

Read the Post in new Window Read the Post in Threaded view  Post #7: 7788 by hagtech on 2006-02-17 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Sounds like a great tube.  Stu just found a bunch in his stash and asked about them on asylum - totally unrelated to this post.  Gold pins, superb construction, etc.  So it must be something special.  Could be great for your mic p...

Read the Post in new Window Read the Post in Threaded view  Post #1: 7788 tube mic pre design by rafaroxlm on 2006-02-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
As you may know the 7788 is a high transconductance pentode which should in theory be able to give higher audio resolution than say 12AX7, 6072 tubes in tube mic pre designs.  On search here the 7788 was mentioned as being used as the ...

Read the Post in new Window Read the Post in Threaded view  Post #27: 7788 Ringing by Lucian on 2008-01-13 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Hello, While the question was addressed to Romy, may I be allowed to barge in :-)?... A question before anything: do you feed the 7788 DC or AC on the filament? Many tubes are perfectly able to oscillate mechanically on 1KHz--20KHz range, ...

Read the Post in new Window Read the Post in Threaded view  Post #8: Re: 7788 by Romy the Cat on 2006-02-17 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="hagtech"]   Stu just found a bunch in his stash and asked about them on asylum - totally unrelated to this post. [/quote] Did your Stu ever learn that anything that deserves any real attraction or interest and exposed to the ...

Read the Post in new Window Read the Post in Threaded view  Post #9: 7788, stu by hagtech on 2006-02-18 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
My Stu never got a reply by the asylum inmates.  Maybe nobody there ever heard of a 7788.  No help.jh...

Read the Post in new Window Read the Post in Threaded view  Post #21: I need a new 7788-7721 (perhabs) phonostage… by Romy the Cat on 2006-12-12 
Browse the content of the threads in new Window  Thread: I need a “second-type” phonostage. in Analog Playback  38 Replies 
I decided to make this post in this thread (you are at a second page of the thread) about the “second-type” phonostage. My needs for a Santa’s bring me a nice “second-type” phonostage really got stronger. If you remember my 7788-7721 tow stages,...

Read the Post in new Window Read the Post in Threaded view  Post #12: The 7788 as a driver to drive 2A3? by Romy the Cat on 2007-11-05 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, It is the super tube – you forgot to mention the amount of noise with its transconductance…. You use the 7788 as a driver to drive 2A3? This is kind of strange: the 7788 has relatively low bias and a typical line voltage should sent 7788 deep in...

Read the Post in new Window Read the Post in Threaded view  Post #14: Still, with all native beauty of 7788….. by Romy the Cat on 2007-11-05 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
… I do not consider it as an interesting driver and I have a good feeling that you will review your desire to drive 2A3 with 7788. 7788 is phenomenal for different application (ultra low noise + ultra high Mu) not for driving power triodes. Jim, if y...

Read the Post in new Window Read the Post in Threaded view  Post #2: Re: 7788 tube mic pre design? by hagtech on 2006-02-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Why do you suggest that a pentode will "give higher audio resolution"?  What evidence is this theory based upon?jh...

Read the Post in new Window Read the Post in Threaded view  Post #28: My experience with 7788 is very different. by Romy the Cat on 2008-01-13 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, I do not know what to say: I never experienced any nose problem with it. A few years ago I built 2 mono phonocorrectors with 7788 at input as a pentode both of them were just nice and quiet and did not give me any problems in noise department. T...

Read the Post in new Window Read the Post in Threaded view  Post #26: 7788 ringing by hagtech on 2008-01-13 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
I am having a LOT of microphonic trouble with the 7788s in a high gain stage.  I run a 40mV input signal into a 7788 triode at 15mA CCS.  Plenty of gain, nicel output.  But dang, if I bump the tube or board or chassis, the grids inside...

Read the Post in new Window Read the Post in Threaded view  Post #5: Re: 7788 - love the tube! by hagtech on 2006-02-15 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Yeah, so the closeness of the grids results in a higher current gain.  So what?  What is the relationship between gain and sonics?  Are you saying that all high gm tubes sound better than low gm tubes?  And does that include 300B ...

Read the Post in new Window Read the Post in Threaded view  Post #6: Re: 7788 - love the tube! by rafaroxlm on 2006-02-17 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim it was probably the 7788.  This "supertube" was military stockpiled and difficult to get until about 8 years ago when finally military released. Then you could get them for $5 but people are getting wise now as per the $30-40 price...

Read the Post in new Window Read the Post in Threaded view  Post #28: My experience with 7788 is very different. by Romy the Cat on 2008-01-13 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, I do not know what to say: I never experienced any nose problem with it. A few years ago I built 2 mono phonocorrectors with 7788 at input as a pentode both of them were just nice and quiet and did not give me any problems in noise department. T...

Read the Post in new Window Read the Post in Threaded view  Post #31: High transconductance and the Hawaiian archipelago. by Romy the Cat on 2008-01-13 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, in my corrector (Dima’s design with R2=50R) I made many experiments adjusting the VR1. Dima proposed 150V on 7788 plate purely arbitrary, what he did it he never ever seen 7788 and it was just a concept RIAA for him. After it was built and I p...

Read the Post in new Window Read the Post in Threaded view  Post #12: The 7788 as a driver to drive 2A3? by Romy the Cat on 2007-11-05 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Jim, It is the super tube – you forgot to mention the amount of noise with its transconductance…. You use the 7788 as a driver to drive 2A3? This is kind of strange: the 7788 has relatively low bias and a typical line voltage should sent 7788 deep in...

Read the Post in new Window Read the Post in Threaded view  Post #1: 7788 tube mic pre design by rafaroxlm on 2006-02-14 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
As you may know the 7788 is a high transconductance pentode which should in theory be able to give higher audio resolution than say 12AX7, 6072 tubes in tube mic pre designs.  On search here the 7788 was mentioned as being used as the ...

Read the Post in new Window Read the Post in Threaded view  Post #24: The Allnic’s Mystery and class “F” operation by Romy the Cat on 2009-10-18 
Browse the content of the threads in new Window  Thread: The LCR RIAA correctors in Analog Playback  57 Replies 
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...

Read the Post in new Window Read the Post in Threaded view  Post #24: A correlation between Gm and sound quality? by Romy the Cat on 2008-01-02 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Lucian, here is where the beauty of 7788 comes - max Gm with absolutely lowest noise ( the area where Russian tubes reportedly can hardly compete). What is particularly cool about 7788 that that are dead quiet one after another. I have near ten dif...

Read the Post in new Window Read the Post in Threaded view  Post #4: Re: 7788 - love the tube! by rafaroxlm on 2006-02-15 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
Thanks for the comments Romy.  Would appreciate pointing out where the schematic is for the 7788 phono preamp or even better your friend´s 7788 mic preamp schematic.  I can use the phono stage circuit minus the RIAA as a starter and th...

Read the Post in new Window Read the Post in Threaded view  Post #15: Driver's Education by hagtech on 2007-11-05 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="Romy"]why don’t not you try my 6E5P?[/quote]I didn't want to steal any of your ideas.  Although, admittedly it was my backup plan.  No question the 6ep5 makes for a superb driver tube.  Had not really looked into who has s...

Read the Post in new Window Read the Post in Threaded view  Post #10: Trying to eliminate audio chitchat on my site. by Romy the Cat on 2006-02-18 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="hagtech"]My Stu never got a reply by the asylum inmates.  Maybe nobody there ever heard of a 7788.  No help.[/quote]7788, gain/noise/bias vise, as a penthod, is pretty much idle first stage for not-extra-stages low input preamp...

Read the Post in new Window Read the Post in Threaded view  Post #16: Come on, Jim! by Romy the Cat on 2007-11-07 
Browse the content of the threads in new Window  Thread: 7788 tube mic pre design in Analog Playback  38 Replies 
[quote user="hagtech"] I didn't want to steal any of your ideas. [/quote] This is very bogus notion. If the 6E5P is somebody’s idea then would be not me but Dima’s as he discovered the tube “for Sound aplicatios” in 90s while he was fixing a TV. Howe...

Read the Post in new Window Read the Post in Threaded view  Post #1: The LCR RIAA correctors by Romy the Cat on 2007-07-11 
Browse the content of the threads in new Window  Thread: The LCR RIAA correctors in Analog Playback  57 Replies 
Keith Cooper mentioned today the AllnicAudio’s 1500 phonostage in the Cessaro thread… http://www.allnicaudio.com/E/e_pdt_ampli_H-1500%20II%20SE.html I know the AllnicAudio, I use their tube sockets, and they are very good.  The AllnicAudio use...
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