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Which preamp for Amp Camp?
Which preamp for Amp Camp?
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Old 19th March 2019, 06:51 PM   #161
xrk971 is offline xrk971  United States
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Which preamp for Amp Camp?
I don’t think a preamp can reduce or cancel out H2 generated in the main amp (no matter whatbphase it is in). The power amp generates more positive H2 on top of the input H2 of the preamp - shows up as more H4 out of the ACA. There is no feedback here so distortion just grows and is additive.
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Old 19th March 2019, 06:59 PM   #162
indra1 is offline indra1  Indonesia
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Quote:
Originally Posted by xrk971 View Post
I don’t think a preamp can reduce or cancel out H2 generated in the main amp (no matter whatbphase it is in). ...
Try it on the sim. Perhaps others who tried ACA with B1 Nutube or BAF2018 H2 board can also chime in.
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Old 19th March 2019, 07:00 PM   #163
bloozestringer is offline bloozestringer  United States
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Default Which preamp for Amp Camp?

Not to derail, but lots of people love 300Bs too, and they are typically syrupy sounding to my ears. I still wonder how my MOSFET Max might compare?
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Old 19th March 2019, 07:14 PM   #164
6L6 is offline 6L6  United States
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Which preamp for Amp Camp?
Quote:
Originally Posted by indra1 View Post
The SSII produces neg phase H2 which tend to cancel H2 of a regular ACA or breathe some H2 back into a bridged ACA.
It does? Where did you find that information...? I think you are referring to the Korg NuTube B1. (And also a bridged ACA has plenty of neg. phase H2 )

The SSII has selectable plate loading, either a resistor or a CCS, the resistor sounds perhaps a bit more “tubey” but I wouldn’t really charactize this as having lots of tube sound. With the CCS it’s a touch cleaner and does clip a bit harder, although with either load the distortion is pretty close to the bottom of what I can measure until it starts to clip. The conjecture above that it produces 1-2% is frankly wrong.

As a linestage I think most users are going to be incredibly happy with it, the sound is very clean, very musical, very delightful. I’d happily use it as my only preamp if I didn’t currently have 4 preamp projects.

As a headphone amp everything said above holds true as well, it can easily drive impedances from Grados all the way up to Sennhiesers, as well as planars and other of the ‘difficult to drive’ headphones.

It’s a great kit, the chassis turned out really, really well, and the first batch is sure to sell out as soon as it’s opened up.

Last edited by 6L6; 20th March 2019 at 11:30 AM.
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Old 19th March 2019, 07:27 PM   #165
6L6 is offline 6L6  United States
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Which preamp for Amp Camp?
Quote:
Originally Posted by indra1 View Post
Perhaps others who tried ACA with B1 Nutube or BAF2018 H2 board can also chime in.
I have all those circuits you list. The H2 widget and the NuTubeB1 are both additive to whatever you connect it to downstream. The NuTube + ACA gets a little dreamy and vague together, but some people will love that sound.

Where the NuTube really shines is in front of a pedestrian class-AB amp - it really changes the character for the positive ( by making the harmonic phase negative...lol ) and makes the tone absolutely beautiful! It’s a circuit that everybody should have so that can try it and see what neg. Phase H2 is all about.

Last edited by 6L6; 19th March 2019 at 07:29 PM.
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Old 19th March 2019, 07:45 PM   #166
RafaPolit is offline RafaPolit  Ecuador
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Lovely project, no doubt! I object to the name, as it (for me at least) has this subtle (or not so subtle) hint that it could be better, but it is kept 'cheap' for 'starving students'. It may just be me, but the name implies it's really not that good, but 'good enough' for starving students. I hope this is just a case of poor wording, rather than actual facts .

With that out of the way, for some of us that have never had the pleasure of listening to Tubes, this may very well be the entry point to that 'other' world to have a taste of it.

That said... I think you nailed it here with this statement:
Quote:
Originally Posted by 6L6 View Post
... the sound is very clean, very musical, very delightful. I’d happily use it as my only preamp if I didn’t currently have 4 preamp projects...
So, keeping in the DIY world... how would this stand up to the WHAMMY for instance (in terms of pure Headphone AMP or as PRE for the ACA)?

I know part of the charm is just building stuff and not always having the best sounding equipment, but there is a limit to what wives allow us to put in the house!

So I'm intrigued, as someone that has already built and love the WHAMMY, if this would provide either a significant upgrade or at least a significant lateral move to invest the time for this project and move it to the top of the list... or will it be a little less good overall and be more of a nice project to build rather than a 'better' end product.

And then there is the ultra-practical approach: for someone wanting to get a grip of how tubes sound, how would this new project compare with market options like the Schiit Vali, which I almost bought just to get an idea of tube sound.

I know you mostly object to giving subjective opinions (which I applaud and is one of the many reasons I admire you), so any feedback, either technical or as subjective as you are comfortable being would be very much appreciated.

Schematics and specs like gain and impedances would just be icing on the cake

Big hug,
Rafa.

Last edited by RafaPolit; 19th March 2019 at 07:47 PM.
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Old 19th March 2019, 08:06 PM   #167
indra1 is offline indra1  Indonesia
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Originally Posted by 6L6 View Post
I have all those circuits you list. The H2 widget and the NuTubeB1 are ...
Exactly. Both the H2 widget and NuTubeB1 set at default pos phase H2 I presume. The opposite effect will happen when a stage which produce neg phase H2 is connected to the ACA. At 48V, the 18FX6A in SSII will produce a small amount of neg phase H2 and almost nothing else, I'm quite certain it will sound terrific with the ACA.
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Old 19th March 2019, 08:55 PM   #168
Skylar88 is offline Skylar88  South Africa
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It's no secret that I've been raving about how good the ACA sounds with the AKSA Lender preamp, but still, I can't stop thinking about one occasion when my ACA sounded absolutely gorgeous. That was before I built the AKSA Lender and when I was still using a B1.

On that fine afternoon, a friend came over to my place for a listening session and brought along a headphone amp from XRK. We hooked it up as preamp to my ACA and I was completely blown away with the bestest, sweetest and most musical sounds I've ever heard. Admittedly, I don't know enough to describe in detail what I've heard, but I guess it could have been H2. Maybe X would be able and willing to describe what is so special about the sound, seeing that it is his preamp.

Last edited by Skylar88; 19th March 2019 at 09:00 PM.
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Old 20th March 2019, 02:29 AM   #169
6L6 is offline 6L6  United States
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Which preamp for Amp Camp?
The SSII is live -

Starving Student II Headphone Amplifier – diyAudio Store
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Old 20th March 2019, 06:07 AM   #170
RafaPolit is offline RafaPolit  Ecuador
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Lovely! I'll continue (repeat?) my questions in the discussion thread as soon as Jason opens up the thread which is still closed!

Looks fantastic.
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