[sdiy] B+ Current consumption

[Michael Ruberto]

I wasn't able to get that schematic to load. I guess the link is bad. I've 
been hunting around for more examples to learn from and found this circuit 
which seems to have some potential.

http://home.cfl.rr.com/dbhammond/Firefly_sch_R2.gif

Meets the simplicity requirement at least.

Any thoughts on it?

M. A. Ruberto


>From: "JH." <jhaible at debitel.net>
>To: "David Moylan" <dave at westphila.net>,"Michael Ruberto" 
><frankentron at hotmail.com>
>CC: <synth-diy at dropmix.xs4all.nl>
>Subject: Re: [sdiy] B+ Current consumption
>Date: Fri, 19 Jan 2007 17:19:39 +0100
>
>UA 175 is what I've built.
>Not recommended for a cheap distortion box - I just noticed that
>the small signal triodes in PP sound good, in that context.
>
>JH.
>
>----- Original Message -----
>From: "David Moylan" <dave at westphila.net>
>To: "Michael Ruberto" <frankentron at hotmail.com>
>Cc: <jhaible at debitel.net>; <synth-diy at dropmix.xs4all.nl>
>Sent: Friday, January 19, 2007 4:22 PM
>Subject: Re: [sdiy] B+ Current consumption
>
>
>Check out the Altec 436C schematic for the simple version using a 6bc8
>as variable mu.  For more complex versions check out the Universal Audio
>175, 176, 177.  Schematics at this link
>
>http://www.one-electron.com/FC_ProAudio.html
>
>
>Michael Ruberto wrote:
> >
> > I just re-read your message and realized I missed the whole "use a
> > triode" part. It's been a long day. Diode biasing isn't needed in
> > something that doesn't have the .7V dead zone...
> >
> > This might sound wacky but since I am dealing with such small levels
> > could I get away with small telecom audio transformers?
> > Not sure what the frequency range is on them though...
> >
> > I have enough tubes to try the push/pull topology but I'll still need to
> > keep it really simple if possible. Can you point out some references to
> > the V-Mu compressor? Sounds interesting.
> >
> > M. A. Ruberto
> >
> >> From: "JH." <jhaible at debitel.net>
> >> To: "Michael Ruberto" <frankentron at hotmail.com>,
> >> <synth-diy at dropmix.xs4all.nl>
> >> Subject: Re: [sdiy] B+ Current consumption
> >> Date: Fri, 19 Jan 2007 01:15:55 +0100
> >>
> >> I don't know.
> >> What I've tried was something very expensive:
> >> UTC A-10 into 6BC8 into UTC A-19.
> >> It's the VCA part of a Variable Mu compressor, and I just found that it
> >> sounds increadibly good with overdrive.
> >> I'm quite sure it will also do the trick with cheaper tansformers, and
> >> other
> >> triodes.
> >>
> >> JH.
> >>
> >>
> >>
> >> ----- Original Message -----
> >> From: "Michael Ruberto" <frankentron at hotmail.com>
> >> To: <jhaible at debitel.net>; <synth-diy at dropmix.xs4all.nl>
> >> Sent: Friday, January 19, 2007 12:00 AM
> >> Subject: Re: [sdiy] B+ Current consumption
> >>
> >>
> >>
> >> Alright so lets assume a diode biased push/pull topology. Would it be
> >> to my
> >> advantage to play with the value of RB1 to get an acceptable distortion
> >> level?
> >> Or should I not use the biasing diodes? ;)
> >>
> >> I've never built anything with audio transformers before so I don't 
>know
> >> what parts to consider. Any suggestions here? The power amp accepts an
> >> input
> >> up to 600mV.
> >>
> >> M. A. Ruberto
> >>
> >> >From: "JH." <jhaible at debitel.net>
> >> >To: "Michael Ruberto" <frankentron at hotmail.com>,
> >> ><synth-diy at dropmix.xs4all.nl>
> >> >Subject: Re: [sdiy] B+ Current consumption
> >> >Date: Wed, 17 Jan 2007 19:39:15 +0100
> >> >
> >> >
> >> >
> >> > >If I wanted a clean sound I would just patch my Presonus TubePre
> >> into the
> >> > >effects loop I am adding to the organ.
> >> > >My goals are to make it distorted and really simple.  I want my
> >> Hammond
> >> >to
> >> > >scream :)
> >> >
> >> >You might consider adding a small push/pull stage with an output
> >> >transformer
> >> >then,
> >> >instead of just building a tube preamp. No power tube required - the
> >> sound
> >> >is in the
> >> >circuit topology, IMO, so you could build something like a 100mW (or
> >> even
> >> >less)
> >> >PP stage from small signal triodes.
> >> >
> >> >JH.
> >> >
> >>
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