Re: Tube amp with 2.5 Ohm speakers??

"Bret Ludwig" <bretldwig@[EMAIL PROTECTED]
> wrote in message
news:631ca48a-23cd-44e9-83d5-dc166e4feb6f@[EMAIL PROTECTED]
> ed 16/8/4 secondary which means only
>>> half the secondary is used for 4 ohm applications in
>>> the first place. Using a four winding
>>> series/parallelable output is an aid, of course, but a
>>> purpose designed 2 ohm output is highly preferable.

>> OK Bret.  That's what I had in mind - series/parallel
>> windings with a 2.5Ohms option.  Thanks for the
>> confirmation.  But are there any other considerations?

> Use of a separate tertiary for NFB is highly desireable in such an
> amp to avoid a lot of ad-hockery and to float or ground the output as
> desired.

Or just scale the RC network.

> One consideration with 2 ohm outputs is that the lower
> voltage, higher current needed for a given power means
> more copper is needed, or I2R losses will be higher.

Common sense. But there will be fewer turns on the secondary, so the
copper 
content could remain the same.

> Also  the turns ratio for a given reflected load will be more
> extreme, yes.

Namely fewer turns on the secondary.