more amp definitions ;-)

[Nick Sheldon]

Hi guys

Adding to the BVA (big valve amp) definitions, here are some in the reverse
direction:

valve amp 10-99 watts
small valve amp 1-9.9 watts
very small valve amp 0.1-0.99 watts
ultra small valve amp 0.01-0.0099 watts
super small valve amp 0.001-0.0099 watts
extra small valve amp <0.001 watts

The last category isn't as silly as it sounds! A 60% efficient hornloaded
speaker can give 110dB for 1 watt in at 1 metre, so 1mW would give 80dB, ie.
about 15dB louder than normal conversation.

Adding bells and whistles to this scheme, multimeters have long used scales
along the lines of 0-10, 0-20, 0-50, so a slight adaption gives "modifiers"
such as:

small valve amp (1) 1-2 watts
small valve amp (2) 2-5 watts
small valve amp (3) 5-9.9 watts

and similarly for all other categories, including the previously posted big
valve amplifier ones, eg.

big valve amp (1) 100-200 watts

Any comments?

Nick Sheldon

[Tim]

> Adding to the BVA (big valve amp) definitions, here are some in the reverse
> direction:

Let's see, I have two

> very small valve amp 0.1-0.99 watts

I think they are around class 2.

> The last category isn't as silly as it sounds! A 60% efficient hornloaded
> speaker can give 110dB for 1 watt in at 1 metre, so 1mW would give 80dB, ie.
> about 15dB louder than normal conversation.

Hmm, 80dB from a...what puts out that "much" power? :)

> Adding bells and whistles to this scheme, multimeters have long used scales
> along the lines of 0-10, 0-20, 0-50, so a slight adaption gives "modifiers"
> such as:
>
> small valve amp (1) 1-2 watts
> small valve amp (2) 2-5 watts
> small valve amp (3) 5-9.9 watts
>
> and similarly for all other categories, including the previously posted big
> valve amplifier ones, eg.
>
> big valve amp (1) 100-200 watts
>
> Any comments?

That means I have a PP amp class 1, a SE amp class 1, and those already stated.

How about classification of preamps? Since power is not the issue here,
I suggest they be rated in voltage output and gain (say, class A1 would be
1V peak, gain of 10, class B2 2V peak, gain 20, C3 = 5V peak, gain 50, etc.).

Tim

--
"Yeah, and I'm not easily impressed. Whoa, a blue car!"
- Homer Simpson

[James]

Hi RATs,

why don't we just use standard multipliers:

hectawatt?: 10000+ watts.
kilowatt: 1000+ watts.
centawatt: 100+ watts.
decawatt: 10+ watts.
watt: 1+ watts.
deciwatt: 0.1+ watts.
centiwatt: 10+ mWatts.
milliwatt: 1+ mWatts.

James.

"Tim" <tmor...@charter.net> wrote in message
news:tt9iuo7...@corp.supernews.com...

[Tim]

> why don't we just use standard multipliers:

How could you? That's way too....rigid. Metric (Ugh). :)

I think I like what I suggested at the end, at least... :)

[Oskari Heinonen]

Tim wrote:
>
> > why don't we just use standard multipliers:
>
> How could you? That's way too....rigid. Metric (Ugh). :)

This is an old subject of endless and mostly pointless battles
(of course metric is the right way). Anyway, James needs to
restudy the prefixes. :-)

http://physics.nist.gov/cuu/Units/

O.

--
Oskari Heinonen * University of Helsinki * Department of Computer Science
Oskari....@cs.Helsinki.FI * http://www.cs.Helsinki.FI/Oskari.Heinonen/

[James]

Oops, botched some of that didn't I - if you follow SI. Mainly the greater
than one cases.

But isn't Deka the Greek multiplier for 10, used for valve bases, as in
duodecar - 12 pins.

Sorry about Hecta, a hectacre is 10,000 sq.m, hence my error.

"Oskari Heinonen" <Oskari....@cs.Helsinki.FI> wrote in message
news:3BD59F65...@cs.Helsinki.FI...