Re: Tube amp with 2.5 Ohm speakers??
- From: "Iain Churches" <IainNG@xxxxxxxxxxx>
- Date: Thu, 20 Mar 2008 10:12:29 +0200
"John Byrns" <byrnsj@xxxxxxxxxxxxx> wrote in message
news:byrnsj-2EB023.15591919032008@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
In article <PPcEj.312846$7Q7.304141@xxxxxxxxxxxxxxxxxxxxxxxxxx>,
"Iain Churches" <IainNG@xxxxxxxxxxx> wrote:
I have been asked about using a tube amp with
low impedance speakers (2.5 Ohms)
This doesn't seem like a big deal if you are specifying the output
transformer. Is the questioner asking what to do with an existing
amplifier that doesn't include an output transformer with a 2.5 Ohm
secondary configuration option?
No. I would specify an OPT with windings in series and parallel
to give the additional 2.5 Ohms option.
Does anyone have experience with this kind
of setup?
No, sorry.
First thoughts are that with PPP in triode
mode one could probably achieve a DF of 10.
I don't understand what SE vs. PP vs. PPP has to do with the DF?
Assuming you are talking about ZNFB amplifiers, I always thought the DF
was determined by the plate resistance of the tubes being used along
with the turns ratio of the output transformer? All other things being
equal I wouldn't think PPP would provide a DF any different than plain
old PP, or even SE for that matter.
It will be an amp with 15dB NFB running PPP in triode mode
(I have a working prototype) The PPP OPT has a primary
of half the impedance of PP.
Best regards
Iain
.
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