Yet another Aikido? NOVAL vs OCTAL - diyAudio
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Old 20th September 2015, 06:44 PM   #1
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Default Yet another Aikido? NOVAL vs OCTAL

OK, I just finished a Tubelab TSE with 300B (Tubelab SE | Tubelab)

The actual preamp is a Pete Millett low-mu preamp running with a 6H13C (6SN7 russian clone) (Low-mu preamp)

The speakers are Cornu (Ever think of building a Cornu Spiral horn? Now you can!) with Jordan Eikona drivers.

And around the house have another two or three projects done (like "Lo Scherzo" amp).

I'm realizing I've always been doing one amp - one preamp alternatively, so now would be time for a new preamp.....

Thinking of an Aikido, seem a very nice preamp, fairly open with lots of possibilities...

But I'm stuck between octal and noval : which one should decide, and why?

I don't need much gain so this is not the point, my questions are more of the type :

- are noval more prone to microphonics than octal (or reverse)?
- may have more hum problem with one of the solutions?
- is there a good experience about sound quality comparing the two?

If I'm correct 6CG7 should be the noval equivalent of 6SN7 so that shouldnīt be a problem, and don't think I'm going to change tubes a lot.

Any suggestions?
I've looked around and haven't found a clear answer, seem as there is the "Noval Clan" vs the "Octal Clan".

Any help will be warmly welcome as I'm really unable to decide on this philosophical question.

Thanks a lot
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Old 20th September 2015, 11:19 PM   #2
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Why do you think there could be a difference?
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Old 21st September 2015, 12:30 PM   #3
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Quote:
Originally Posted by JonSnell Electronic View Post
Why do you think there could be a difference?

Thatís exactly what Iím asking : understand if there is a real difference between octal and noval or itís more of a sense of aesthetic, or a feeling or something equally subjective.

Itís equally possible that topology should be taken in count as a strong actor in the quality of the sound, so Iím back with the first question :

Are there any criteria to decide between octal and noval in a new preamp?


Thanks
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Old 21st September 2015, 01:18 PM   #4
Einric is offline Einric  United States
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I'm running a 6CG7 Aikido into my F4 and I love it.
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Old 21st September 2015, 03:02 PM   #5
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Tube industry changed from octal to noval (for the small tubes) because of tube capacity.
With lower (miller)capacity frequency respons is better.
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Old 21st September 2015, 04:16 PM   #6
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I'm running 12sn7 octals, because they are less sought after than 6sn7. Sounds great, no hum, no perceivable micophonics.
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Old 21st September 2015, 05:59 PM   #7
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There are more tube choices in noval (nine pin), so I'd probably use those if I were to do it again, ESP. In high gain situations. No complaints with my non- phono needs. I like the retro look of octals.
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Old 21st September 2015, 07:43 PM   #8
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Default See link to my experiences with Aikido LSA

It's a noval version but it might help.

Cheers, Steve

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Old 21st September 2015, 08:03 PM   #9
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Hi , i never heard a noval but i have an octal and the sound is wonderful, now i will start
tube rolling with NOS types,

cheers
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Old 22nd September 2015, 05:59 PM   #10
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Thanks all for answering and giving me possibility to think : confronting ideas, debating, listening to other's opinions is always important and rewarding, so after reading and thinking this is what I'm going to do :

given that I already have a 6SN7 preamp and am not totally convinced about octal......will go and build one LV Aikido, a low voltage one, using 6S27P tubes, they work with only 24V !!!!

A nice experiment, and if works will have the perfect gift for a first preamp for my daughter
If not, these tubes are relatively cheap and all experience is good.

So thanks all, will give info as the project go on.....
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