Solid State Amplifiers > Tubes and Hybrids

Hybrid project started.

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Zappacat:
Hey Phatt, can you elaborate a little on what "semi-passive" tone stack means in your diagram?  Thanks!

phatt:

--- Quote from: Zappacat on October 10, 2009, 12:13:29 PM ---Hey Phatt, can you elaborate a little on what "semi-passive" tone stack means in your diagram?  Thanks!

--- End quote ---
Sorry for any confusion ,,,It's the very same one I've posted here under schematics and Layouts.. *The PhAbbTone box*.

I only used the phrase *semi passive input* simply because only the input is passive the output is of course *Active*. Since posting my tone circuit I've realised that by calling it *Passive tone * some may see it as bending the truth :-[

That little gem of a circuit just saves a whole lot of stuffing around with the needless complexity of a whole front end preamp.  Heck who wants the cost and work of wasting a whole triode stage when this simple trick does the same job.
Cheers, Phil.

phatt:

--- Quote from: Brymus on October 09, 2009, 02:50:41 PM ---How is your project coming ?
I missed this thread somehow,but I had the exact same idea.
Re-amping a Firefly type amp with a lm3886.
I recently heard a Firefly that used ECC99 for the output tube and it was SO much better sounding than the 12AU7 version the guy built it out of.
But the ECC99 is a new tube and there isnt much on the web about it.
I would love to see a schemaitc of a 10 watt PP amp using 4 ECC99 tubes(sorry off topic)
Also I like the idea of the NEO spkr.
I want to build a light weight amp using toriodal trannies and a NEO spkr,aluminum chassis,
And Pine cab shouldnt weigh much like that.

--- End quote ---
Brymus,
           I have no doubt that the firefly would work as you describe but 10 watts from a quad of small signal triodes (ECC99) I very much doubt?
From my understanding  these are still ONLY a small triode.
I've already stated in my last post why the firefly may not be the ticket some dream of but hey,,,I've been wrong many times before.
In my experience even a small Single ended Pentode like a Fender champ would Eat a triode PP amp for crunch.
Phil.

Brymus:
Phatt the data sheet for ECC99 lists a quad for 10 watts in PP or 2 for 5 watts a single ECC99 is 2.5 watts in self split PP on the Firefly.
This is a new tube developed by JJ for use as a headphone amp as a driver in an amp like 300B or for low wattage PP designs.
It has been getting rave reviews for audiophiles and guitar gear junkies alike.

J M Fahey:
Personal opinion/taste: I hear overdriven triodes "bland/soft" sounding compared to overdriven pentodes.
In a preamp (which usually tends to provide "buzzy" distortion), a triode may be the way to soften that somewhat, and that's what's used by 99,9% of makers (with a few notable exceptions), and not forgetting their low cost, abundance, ease/tolerance of biasing and the fact that they usually come "two per pack"; but for *power* distortion pentodes beat them all the way.
A humble 6BQ5/EL84 or 6V6 beats any triode to death.
I often use an EF184 directly driving power MosFets with very good results.
Juan Manuel Fahey

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