Re: Norton amplifier from 1940's (pics)
- From: Patrick Turner <info@xxxxxxxxxxxxxxxxxx>
- Date: Mon, 25 Aug 2008 13:16:34 GMT
patrick jankowiak wrote:
This amp showed up. Gives an idea what it took to make 200 watts of
audio in 1940.
http://www.bunkerofdoom.com/Norton1/index.html
There is no model #, but if anyone knows where there's a manual with
specs and schematic, it would be useful. I have already drawn the shcem.
for the preamp and driver stage so you can see it.
All Kenyon iron too.
PJ
If you want to make 200W of power with tubes now,
and you wish to use triodes, then 4 x 845 is a nice way to do it
and you'd need a similar sized chassis for at least the power amp as in
1940 if you like to to things right.
I recently built a pair of class A 55W SET amps using 2 x 845 per amp,
and I used all the weight of iron they used in 1940 and perhaps more per
watt, being SE.
2 x 845 are also capable of giving 55W class A in PP,
with Pda at idle = 78W per 845, same as with SE use.
If one lowered the Pda to about 60W each tube, then you'd get about 40W
max of class A,
but maybe 100W in class AB1.
But today we'd use silicon rectifiers and voltage doublers to make the
B+
required for such amps, so the PSU chassis would be a lot smaller and
simpler than in 1940.
And the chokes for filters would now be smaller because we have reliable
electrolytic capacitors of enormous
capacitance values and small size, much better than the huge paper in
oil types they used.
Patrick Turner.
.
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