#3601
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Re: the KT120
I like them [KT120] in my 17wpc SE KT88 HO. With my 92dB Von Schweikert speakers. They aren't as warm and romantic as some output tubes, but they add just a bit of warmth along with good detail & imaging, along with the best defined deep bass I've gotten out of any output tube. Overall they come across to me as a highly accurate tube which may sound somewhat SS to many but does add some tube goodness. On complex classical music, they are the best tube I've heard With the caveat that I have yet to audition a KT150. I can understand why some of the most expensive tube amps on the market have gone with KT120s. But if one is looking for single-ended 300B / 2A3-type sound, this isn't it. Last edited by Bombadil; 04-25-2017 at 09:03 PM. |
#3602
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Bombadil: But if one is looking for single-ended 300B / 2A3-type sound, this isn't it.
It's a matter of choices. I believe the Triode-strapped Inspire amp is best within a continuum of output tubes, OTBE, ranging from the 6V6-6L6-KT66-KT77-6550 and KT88 (at the other extreme). Not that other tubes are not interesting, but the tradeoffs involved in said range of output tube specs are more attuned to the mid-range magic of the Triode configuration, with the KT77 at the climax of that optimal tradeoff. Pentode configurations are different, I'm sure. Dialing-in the LP-27a and Triode-strapped Inspire amp with those considerations, through synergy-triggering input and rectifier tubes, makes a big difference. In my case, mid-range magic at affordable output tube prices and about 5 watts (relative to the 2 watts of the best true-Triode tubes) is an objective. As FloridaBoy stated, there's an added synergy potential through the dialing-in of the preamp, which I frankly had been missing, so there's an opportunity there to improve things further at reasonable costs. In the end, what makes sense to me is maximizing the mid-range performance (transparency, tri-dimensionality, instruments' timbre and texture), where most of the audible music spectrum lies, while still preserving acceptable levels of bass and dynamic qualities. Last edited by Musica Amantem; 04-25-2017 at 10:09 PM. |
#3603
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The two types of tubes I've liked the least in my SE KT88 HO have been 6V6 and EL34. I've tried 4 different brands of 6V6 and while the sound has a lot of good qualities, I find them too forward in the upper midrange and too light & ill-defined in the lower bass. All four brands have had a similar sound. I've only tried two brands of EL34 but in my amp & system, they are lacking in high frequency detail and imaging, and are a little loose and fuzzy on lower bass. Great on vocals and blues sound very good with them. But overall I find them to come up short on many types of music.
Also my treasured Sylvania fat boy 6CA7s, which sound so good in my triode push-pull amp, are only a little better than the EL34s in my Inspire. However I like my EI 6CA7s much better in the Inspire. I'm sure a significant factor in this are my Von Schweikert speakers. They excel in creating a big, wide, deep soundstage, which I love. And they go deep (sub-30Hz) while being very clean and neutral. No mid-bass emphasis, as found in so many speakers. I've grown addicted to that ultra-clean, well-defined bass. Tubes which come up lacking on the bass end are exposed, as are tubes which compress detail & imaging. Last edited by Bombadil; 04-25-2017 at 10:36 PM. |
#3604
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Quote:
The 6L6 is a wonderful sounding tube in it's many configurations. My particular favorites are the 6L6G, 6L6GA, and the 6L6GAY. Of the 6L6GC versions, I like the GEs the best. The guitar amp guys tend to gravitate towards the RCA 6L6GC black plates, which command premium prices. So much so, I couldn't resist liquidating a quad last week. But to my surprise, they went to an audio guy. I have a lot of 6L6WGBs, 5881s, etc, but the gem of my 6L6 stash is a NOS quad of WWII vintage Sylvania JAN 6L6GAs with the U.S. anchor printed on the base. I'm saving them for when I build a PSE beam tetrode amp.... |
#3605
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These are my favorite 6L6GCs too.
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#3606
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Quote:
I'm a PIO kinda guy but I installed some V-Cap copper/Teflon caps in the amp and a Takman carbon film resistor. I've tried other caps in the amp but these are staying. PIO smoothness with great definition/resolution and tight bass. I liked the 6L6G/A's before but the caps took them up a few notches. It's too bad that we aren't in the same neighborhood because hearing is better that two dimensional words. I'd like to hear it driving your refrigerator sized speakers. I'm not shilling the 6L6GA tube and I'm running 'em in triode so....YMMV. They would not be very powerful single ended either and HE speakers would be a must...otherwise it'd be little girl with a guitar. Last edited by FloridaBoy; 04-26-2017 at 11:59 AM. |
#3607
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Quote:
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#3608
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I have not listened to KT90, KT120 or KT150's, but it is my impression these may excel in limited features at the expense of midrange quality. Of course, this is just subjective, and relating only to the Triode configuration. |
#3609
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Quote:
I already have the Shuguang CV-181 T (Black glass, white base) and the Psvane CV-181 T-II (gray coat, bronze base), the latter my current favorite. I also think I should try the Super-Radiotron 6SN7 GTA in the Pre, as I like that one a lot also. I may try getting the Shuguang UK 6SN7 or the Shuguang CV-181 Z ... Man! Finally, I still need to overcome my fears of damaging my precious amp while performing a DIY Caps upgrade! Last edited by Musica Amantem; 04-26-2017 at 08:28 AM. |
#3610
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You can solder. If I, the six toed sloth, can...so can anyone. The thing about input tubes is that they are like spice. You just have to try different combos to find what you like. I'm no longer using any old production but I'll keep what I have. You should consider adding a CV-181z and a UK 6SN7. They all do sound different.
The V-Caps have pretty much settled in. I think you too will be impressed. The burn in is weird and long but worth it. I had 6L6GA's and liked them. I guess I just hit the home run tube line up last weekend. I bought more because they will never be made again and really good ones are getting scarce. |
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