Re: Battery bias directly to grid

Circuit sent to you by e-mail. Anyone else unable to see it? It works
on my Mac in Internet Explorer but I see that in Safari the gremlins
render the URL copied from the newsgroup and pasted into the search box
as
http://members.lycos.co.uk/fiultra/Discussion%20Circuits.htmpage/
from which you have to knock off the "page/" before it works. This is
the right URL again...
http://members.lycos.co.uk/fiultra/Discussion%20Circuits.htm

Andre Jute

Patrick Turner wrote:
> Andre Jute wrote:
>
> > I've posted a circuit for discussion at:
> >
> > http://members.lycos.co.uk/fiultra/Discussion%20Circuits.htm
> >
> > What are the implications of this circuit?
> >
> > What, theoretically, makes it better than the standard battery bias
> > application in the cathode circuit?
> >
> > Will the batteries charge as efficiently in this position as in the
> > cathode circuit; what are the effects of the resistors topping and
> > tailing the battery set?
> >
> > What are this circuit's dangers?
> >
> > Are there alternatives that work better or are safer?
> >
> > Andre Jute
>
> Unfortunately the images won't appear in the page in either Netscape
> or IE.
>
> I have to say I have yet to use a battery in a tube amp for biasing,
> but they can work well and unlike even large value electrolytic caps
> used for bypassing an Rk the battery remains a low impedance as F falls.
>
> So the battery acts to render the amp a fixed bias amp, with possibly
> better bass extension.
> But for me the use of batteries isn't warranted since i can easily
> achieve a bandwidth down to 5Hz without much phase shift
> so any improvement due to batteries might be an illusion.
> And the idea of a battery leaking junk liquid all over the internals
> isn't nice...
>
> If I could see more of the details I might be able to comment
> more appropriately.
>
> Patrick Turner.

.

Relevant Pages

  • Re: Battery bias directly to grid
    ... >>> I constantly use battery bias in the cathode circuit. ... No part of a tube stage is without ...
    (rec.audio.tubes)
  • Re: Battery bias directly to grid
    ... Those self-charging advantages of the battery in ... Battery in cathode circuit. ... grid stopper resistor. ...
    (rec.audio.tubes)
  • Re: Battery bias directly to grid
    ... >> I constantly use battery bias in the cathode circuit. ... No part of a tube stage is without ... Not in the direct signal path between pot wiper and grid. ...
    (rec.audio.tubes)
  • Re: Newbie trying to fix a Johnson FT-2 Tremolo Pedal (for guitar)
    ... determine a short or near short circuit. ... then C9 shouldn't be the problem if I'm using a battery. ... regarding my non working 9v AC power ... equipment, dead wall warts, or both. ...
    (sci.electronics.repair)
  • Re: Battery bias directly to grid
    ... > the grid leak resistor, ... > third possible position, in the cathode circuit, simply because I could ... > hear no difference with the battery in the grid leak position, ...
    (rec.audio.tubes)