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| Romy the Cat's
personal site dedicated to advanced audio and evolved music reproduction
techniques
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Romy,I would like to know, if you do not mind to explain, since you cannot drive your bass modules using SET, why you use Solid State amplifiers instead Pentode or Push-Pull Triode?Thanks!...
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I was rummaging through a pile of tubes and came across a pair of 8233. Medium size tube, gold pins, PQ. I think it might have been a video output tube for an old Tek scope. So I looked it up on Duncanamps. 10W plate dissipati...
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Hello first, as I am new on this site...
I have tried a number of high Gm pentode/triode tubes, including E55L and, of course, 7788. All are very linear when used as triodes, but do not bet on very low noise, if that is what you would be after. Th...
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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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I never knew that Quicksilver does 6C33C, they never did when I was still monitoring what companies do. Their Triode Amp was, if I remember correctly, a base PP unit with a pair triode strapped 6L6/KT-88 tubes, where people were trying to put-in many...
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This is by Hans Beijner. His site is: http://www.tubetvr.com/In 1976 a Mig 25 fighter jet landed in Hokkaido in Japan, it was flown by a soviet military pilot that wanted to defect to the west. This was a real field day for western miltary peopl...
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[quote]I wonder what would be the 7721’s plate impedance at 12mA[/quote]According to the chart on the last page of data sheet, I'd say roughly 2.4k (as a triode). You can always add resistance in parallel with the load.jh...
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[quote user="JJ Triode"]2. Offer to build and sell the full-range Melquiades by custom order. I know you have various reasons to put the Melq in the public domain and not build it for money, but you could leave the "plans" here on GSC and still sel...
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[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 ...
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Romy, doesn't Tim de P also use this cool Miller capacitance idea in his never-mentioned "high end" tubed corrector? Also, do I remember reading that he runs both channels through the two halves of the same twin-triode 9-pi...
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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...
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That 8233 might do it. Also noticed the 6CL6 in triode mode will get you almost there, but only a mu of 20. The 6688 could be a substitute.jh...
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...he uses one section of the 6SN7 for gain, the other as a cathode follower to provide current drive to the grid of the output tube. On some of his monoblocks he uses a dissimilar dual triode like a 6DN7 or 6EM7 this way, with the lower gain-lower ...
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Some facts:The Japanese horn scene uses colored amps like 300B and prefers to buy Japanese amps.American horns are mostly slightly modified pro gear, quite a bit away from the price range Lamm has in mind, so the market there is not larger than that ...
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[quote user="Paragon"] Romy,any information out there for a set of Power / Audio output Trans/ for a Single-Ended 6336B Monoblock project? Thanks, The Paragons [/quote] The 6336B is twin triode, I have seen some peoples is it but I personally have ...
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[quote user="cv"] Consider a triode connected 13E1. 95W dissipation, will probably work beautifully with the existing OPT if you adjust the gap down and if you can rewire your arrays to present a somewhat higher impedance.Something like 400V-450V / 2...
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[quote user="JJ Triode"]I'm listening now and the sound is quite good in my opinion. Ma is plying from WGBH's studio in Boston so I presume they are carrying the stream as well. He is on for one more hour.[/quote] I did not get the feeling that he wa...
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I had a little flash a few days ago thinking about potential.I've been following more high tech gadgets lately, things like the iPhone. And pondering ideal audio setups from the erspective of design and ergonomics. This had me thinking about solidsta...
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You could always pull the grid low on the unused triode section. And ground the cathode. That would prevent stripping, I believe. Just bias it to -100V or whatever.jh...
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[quote user="JJ Triode"] It is indeed an amazing ride.[/quote] Actually I was listening the very same 8th probably 6-7 times since we return back from UK. It is truly wonderful interpretation with the last two moments being absolutely phenomenal. BTW...
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Paul, you wrote:the best bass I have heard came from triode PP ampsWhich PP triode amps, using which output tubes?the little 2A3s have wonderful bass (as far as it goes...)Which 2A3s? The Wright 3.5s, other single-ended, or PP?I am mostly using PP a...
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http://www.theabsolutesound.com/articles/lamm-ml22-single-ended-triode-amplifier
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I looked at the schematic for Herb's 300B SET many years ago. It's been copied and slightly modified by many.... personally, I would not use it for a 300B amp... then again I probably wouldn't use it for a 2A3 or 45 either (I think my input/driver d...
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Well... tis for all reading/following this thread. As Romy pointed out, having high gain is not the same as power. And as Adrian hinted at... the overall system paradigm is important. If you're only barely cracking the volume control on yo...
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[quote user="rowuk"]Amir,In live music, we have intermodulation. Two trumpets or a trumpet and oboe playing together create sum and difference tones that change depending on pitch interval for instance. For music in major keys, this intermodulati...
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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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Hi,[quote user="Romy the Cat"]could I instead of trashing the tube to flip it to the left filament and continue to use the unused part of the cathode, plate and filament? [/quote]Sure you could.[quote user="Romy the Cat"]Theoretically it might be the...
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Romy,Nah, I just want to careful with what I have left, dont want to have an amp without tube for now. The gold grid tube probably take a while to get them. From what I remember from a tube dealer who said that these 6C33C need to have the heater bur...
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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 ...
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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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