[sdiy] B+ Current consumption

[Michael Ruberto]

Travis,

I wish I saw this email earlier, I already went and ordered a 150V CT 
transformer. I'm not looking for fidelity, I'm actually trying to put some 
scream into a solid state Hammond organ. The preamp is going to be between 
the existing preamp and the power amp with a bypass switch. The design I am 
looking at is more of a distortion type effect but it can sound clean with 
lower gain settings.

M. A. Ruberto

>From: "Travis Shire" <tshire at charter.net>
>To: <synth-diy at dropmix.xs4all.nl>,"Michael Ruberto" 
><frankentron at hotmail.com>
>Subject: Re: [sdiy] B+ Current consumption
>Date: Tue, 16 Jan 2007 20:19:02 -0500
>
>Don't forget about your plate load resistors. They'll drop the voltage
>that's actually seen by the plate. Dunno what volatage you want to see at
>the plate, but I'd think the 300vct would be a better bet. 12a*7 tubes 
>sound
>better at higher plate V. The highs are nicer and there's none of that
>artificial tonality that they take on in a starved plate design.
>
>What's the application anyway?
>
> > I am planning to try a few different tubes just for some experiments but 
>I
> > mainly have 12au7. I guess a little extra current capacity wont hurt.
> >
> >
> > >
> > >If you need to drop voltage you can use several high power zeners in
> > >series.
> > >
> >
> > That sounds like a good idea. I have just located another transformer 
>that
> > has 150V CT. It is about half the price too.
> >
> > For the heaters I see some circuits use 12V and others use 6V. I even 
>have
> > one where it specifies 4V. Does this voltage requirement vary with the
>tube
> > too?
> >
> >
> > M. A. Ruberto
> >
> > _________________________________________________________________
> > The MSN Entertainment Guide to Golden Globes is here.  Get all the 
>scoop.
> > http://tv.msn.com/tv/globes2007/?icid=nctagline2
> >
> >
>

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