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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Ok, once I got pin 8 connected to pin 1, the curves came out straight. Here is the true pentode plot at 200V screen, 0.5V/step:[img]http://www.hagtech.com/blog/images/7788-04.jpg[/img]And here is my new data sheet plot for triode mode:[img]http...
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My Stu never got a reply by the asylum inmates. Maybe nobody there ever heard of a 7788. No help.jh...
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BTW, Thorsten had an LCR corrector around 7788-7788T. I made in past and it was slightly tacky but still quite good… ...
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The 5E6P is the same as my 5E5P only with more or less military ambitions and with congenital “western” pins layout. It has more fragile specifications and more tight tolerance then 5E6P but it is the very same tube. There is very very very minor...
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[quote]I need juts one amps and one speaker[/quote]I don't design amplifiers for myself. I design them for others. And I am always on the lookout for something new or different or any possible improvement. Not all customers wan...
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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,...
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… 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...
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[quote user="Romy the Cat"]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 no...
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[quote user="montepilot"]How would modifying preamp affect sonic character other than just providing more gain. What's the advantage? Once such a modification is made are you restricted to using the 6E6P-DR tube only? Will it change the sound o...
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[quote user="Romy the Cat"]
Anyhow, here is what I think I would do if I use the Alnic’s Preamp. Get rich the 7721 and 7788 and to put in there my 6E6P-DR in triode mode. The tube has very same pins and a full equivalent. Increase the plate voltag...
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Guys from a Russian audio site come up with an idea of MM corrector that I find very interesting, take a look – it is self-explanatory. The firs tube is Russian equivalent of 7788. The second is “my” 6E5P, though I would use 7721 – sounds better in o...
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I'll buy some more 7788 and give them a try. I'd hate to change tubes at this point. My triode connection has pin 8 (g3) to anode, not ground). I wonder if that makes a difference. Also, the power supply chokes are nearby, per...
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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, that sample. So no...
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Guys, the guy who actually designed the circuitry is hiding somewhere within this site. I hope sometime he will step out of the closet and you will be able to abuse him about the 7788. While he is on a witness protection program I am posting a pictu...
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Romy, I tried out a 6e5p as a driver tube in a PP 2a3 amp (was using a 7788 for driver). Well, knock my socks off! The amp went from 6 watts to 8 watts! Distortion dropped a tad, but mostly it was more signal swing. I could dr...
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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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a Hong Kong-based company DIY Hifi Supply is selling RIAA EQ modules, the first modulesthat I have seen at 10kOm. It is something that Thorsten did not do commercially… but if the silks sound good then it might be VERY interesting. Is anyone kno...
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It is nice to see you around, Jim.
A few comments. C1 in my phonostage is .28uF. The higher values were a proposal of Anagnostopoulos. I understand what he is coming form and yes my output stage of power amps will be able to handle the ULF stress. I...
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[quote user="hagtech"]Yes, it is an E55L. I wonder how stable it is. Interesting to me how many of these "uber-tubes" are designed for RF operation. Should make a wonderful oscillator. [/quote]
Go figure not stable are they. ...
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Looks like another case where clean AC wall power is demanded and supposed. Since they use triode output, I wonder if the "gain path" of the pentode is "wired triode", as well, or if they just want the extra gain to scrub in the upcoming RIAA; or ma...
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Perrew,
I would take RL filtration ageist C filtration any time and under any circumstance. If you look at the circuit of 600R LCR classic Tango filter
http://www.vinylsavor.de/lcreq.gif
…then you will see that the serial capacitance al...
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Why do we even bother with tubes for low levels? Of tubes generally, I have used 6SN7s, 2A3s and EL34s with no known-to-me problems, but lots of various noise trouble with certain tubes, including 6DJ8 family, KT88s, and on and o...
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I guess I need to try out some more samples. Only have a few here. And only one has a long time constant 5kHz ring. Heaters are 6.2Vdc with 20mVrms sinewave ripple at 120Hz. Fed from schottky - L - C. Other side of heate...
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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...
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Yes, thanks Charles and thanks for everyone who sent the direct amps on this subject.
The ClarityCaps, similar to the Canadian Solens, British Ansars Supersound, the French MKP, and a few others proposed, are all Metallized Polypropylene caps. I am ...
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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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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...
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[quote user="perrew"]Romy,one thing that interest me is you use an active RIAA and the Allnic is passive circuit if I understood things?[/quote]
Perrew,
Among the none-commercial, home-made correctors here is my evolution of phonostages.
...
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Ok, what would believe…. but I am in needs to get another phonostage. Te older I become the lazier I become and there is no way I would switch those cables form tonearms again. Also, each time I switch the cables the unused cables drops behind my rac...
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Are any who made high-gain phonostages dealt with vibration damping tube sockets? Since I’m thinking not about my next generation of 85dB gain two-stages phonocorrector:
http://www.goodsoundclub.com/TreeItem.aspx?PostID=2453 (second page)
I wonder ...
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