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Inspire by Dennis Had Enjoying Vacuum Tube Audio

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  #31  
Old 01-07-2022, 02:33 PM
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I am using KT-170, PSVANE 274B and KEN RAD CKR-6SN7GT/VT231 tubes. Speakers: Zu Audio Dirty Weekend MK.II, Pre-Amp: Roy Mottram SP14/Special V22. KT88's has a "Jazz Club" soundstage, Smooth in all ranges, Bass is controlled (deep) and a very imminent presentation. The KT-170's (after 10hrs) Opens everything up, Wider and Deeper Soundstage, the sound Floats around you. No need to tube roll at this time as this tube selection works very well.
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  #32  
Old 01-22-2022, 08:42 PM
Sol-Tung Sol-Tung is offline
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Default KT-170 Tubes compatible with IFA-1 ?

I know this amp accepts KT-150 - will it interface with KT-170 tubes? If so, does anyone have any recommendations for a rectifier that will work well with the KT-120,150 or 170? (assuming the KT-170 will work in the IFA-1)
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  #33  
Old 01-22-2022, 10:39 PM
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Sol-Tung… Welcome to AA!
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  #34  
Old 01-23-2022, 04:24 PM
Isaacc7 Isaacc7 is offline
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Quote:
Originally Posted by Sol-Tung View Post
I know this amp accepts KT-150 - will it interface with KT-170 tubes? If so, does anyone have any recommendations for a rectifier that will work well with the KT-120,150 or 170? (assuming the KT-170 will work in the IFA-1)
Dennis has said you can use those tubes but don’t expect any more power than what the KT88 gives you. Dennis likes these tubes quite a bit in the amp, I haven’t tried them… yet. Lol.

I think the 5ar4 or equivalent is the rectifier to use for the high power tube. At ;east that is what is recommended for the kt88.
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  #35  
Old 01-23-2022, 06:05 PM
Sol-Tung Sol-Tung is offline
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Thank you - so the larger tubes do not produce additional watts , however, is it true that additional headroom / dynamics may be a result of the larger tubes? I have KT-120's and they are nice, just pondering what the larger tube does ? yes, that's what she said....
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  #36  
Old 01-24-2022, 10:58 PM
Isaacc7 Isaacc7 is offline
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Quote:
Originally Posted by Sol-Tung View Post
Thank you - so the larger tubes do not produce additional watts , however, is it true that additional headroom / dynamics may be a result of the larger tubes? I have KT-120's and they are nice, just pondering what the larger tube does ? yes, that's what she said....
There isn't any more power to give so no more headroom. They are different tubes so they are bound to sound at least a little different.
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  #37  
Old 01-31-2022, 03:25 PM
FloridaBoy FloridaBoy is offline
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Default Sophia Blue KT88's

I have about 50 hours on a pair and they are sounding quite good.

I'm running them in a triode strapped Inspire amp that I bought from Dennis in 2016. So, this may not apply to non-triode amps. They sound like DHT's.

I'll post more after another 100 hours.

Last edited by FloridaBoy; 01-31-2022 at 03:35 PM.
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  #38  
Old 01-31-2022, 11:11 PM
Isaacc7 Isaacc7 is offline
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Quote:
Originally Posted by FloridaBoy View Post
I have about 50 hours on a pair and they are sounding quite good.

I'm running them in a triode strapped Inspire amp that I bought from Dennis in 2016. So, this may not apply to non-triode amps. They sound like DHT's.

I'll post more after another 100 hours.
I would be very interested in comparing a SEP amp with a SET, using the same tubes. The KT88 is supposed to be really good as a triode. I've also heard that the 6v6 is supposed to be great as well but with a lot less power.
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  #39  
Old 03-17-2022, 10:25 PM
Isaacc7 Isaacc7 is offline
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So the GEC E3375 is amazing. Clean, clear, articulate, if a little light sounding. When I combine them with an RCA 6bx7 the sound is remarkable. Looking at pictures it does look like the E3375 and the GEC KT77 have identical plate structures though they do bias up differently. If the KT77 sounds like these I understand why people consider them a holy grail tube. The E3375 cost a lot less than the KT77 though lol. Unfortunately they now seem to be unobtanium, I can't find any at all. Still, I now have 6 of them and that should do me fine, especially considering how many other great sounding tubes I own lol.

I will be getting in a bunch of 6aq5 from Brimar and a French brand I can't remember. Will also be getting in some Telefunken El90 which as far as I can tell are the same thing as a 6aq5. The 6aq5/el90/6005 is supposed to be a slightly downrated 6v6 in a 7 pin tube. Since I like the 6v6 tubes so much I figured I'd try these vaunted marques. They aren't very expensive so why not?

On the other end of the price spectrum I impulsively bought a pair of CV1102 tubes. Along with my E3375 these may be the most exotic tubes I'll pout in my amp. They have the same pinout as a gf8g but have a noticeably higher heater current. Luckily Dennis made the KT88 Firebottle able to handle the 6bx7 which is even more demanding. Anyway, looking forward to trying some GEC input tubes soon!

I just got in a pair of Tungsol 6c8g tubes. They have the same pinout as the 6f8 but have a higher mu. I have heard that these have similar sonic signature as the other round plate Tungsol tubes. I love my round plate 12sn7 Tungsol in my preamp and so I'm looking forward to hearing what these can do in my amp. Stay tuned...
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  #40  
Old 03-30-2022, 08:20 AM
Huduguru Huduguru is offline
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@Isaacc7 : I am beginning to roll tubes in a June 2021-production Firebottle amp w/volume control, and am curious about your experience with 807/5933 power tubes and associated rectifiers. How does the 807 compare to say a kt88? I like the availability of the 807 and the quirkiness of it (adapter and top cap), but am curious about sound. I love more solid low end of the bigger tubes, but want to check out the 807 and any compatible retifier/input tube combo with it.

Last edited by Huduguru; 03-30-2022 at 05:08 PM.
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