Altec 291-16B

[battradio@]

I just purchase an Altec 291-16A driver that will have to go to GPA for a new diaphram and remagnetizing .What is wanted out of the driver is maximum sensitivity , it is to be used with a crystal radio with no amplification .Right now a Trim horn with a 12" bell is mated to a sound powered elementand it produces sound levels on a loud station that can be heard clearly for twenty feet .
Vintage Altec Lansing 291 16A Driver, Western Electric - eBay (item 120510217173 end time Jan-04-10 01:00:16 PST)




I will be using two UTC-LS 12's as matching transformers and will have an input impedance of 240,000 ohm and an output impeadance of 24 ohms into the driver.

What would be the best horn to mate with this to get maximum volume .

Mark

[Old Guy]

Interesting project....

No big deal, you mention 291-B in the title but you actually bought an A.

The only reason I point this out is there is a substantial difference, th B has a much larger magnet and other differences.

In addition to volume, you also want as full range as possible. For that reason I'd recommend a 300 HZ horn.

A more directional horn is going to concentrate more power in front of it and less to the sides. A 203 series might be an option there.
It's also got a nice funky appearance that would go well cosmetically...

If you are willing to travel a couple hours or can talk the guy into shipping, this is next door in Kansas...

Vintage Altec lansing 203B Horn

Just posted last nite...

[battradio@]

Hi Just a type-O on the title , Thanks for the heads up for the horn set him an email .
Will see if it will take a 24 ohm diaphram .

Mark

[Panomaniac]

Very cool project! Hope you get the 203 horn.

Of course something like the WE 15A horn would be ideal - but giant horn, big bucks.

EDIT: I was thinking about your 240K:24R transformer. That's a winding ratio of 100:1, right?
It's surprising that there is enough voltage on the secondary to get anything out of the horn. Is that what you are using now?
I had a crystal set as kid, worked fine with headphones. Never thought about a horn and driver. Cool.

[Old Guy]

Hi Just a type-O on the title , Thanks for the heads up for the horn set him an email .
Will see if it will take a 24 ohm diaphram .

Mark

No problem on the typo, just wanted to clarify. Sorry if I offended.

The 291 will bolt right on to the 203, and a 24 ohm fram will fit the 291 you bought

288 C and 291A are the same magnet just fram differences.



Great Plains Audio has real Altec frams, and magnet recharge was free last ones they did for me, I think that is still their policy...call to ask.

[Altec Best]

Great Plains Audio has real Altec frams, and magnet recharge was free last ones they did for me, I think that is still their policy...call to ask.

Yes it is.....

[analog addict]

Hey Mark,

Sometime we should talk about the single 288C (and 803B) I have laying around....







Or conversely, if you decide you don't need your 291A....

[battradio@]

Hi Jack ,

Sent PM

[Panomaniac]

Hey Analog! That combo is just what I need for my center channel.

Some day.....

[battradio@]

Very cool project! Hope you get the 203 horn.

Of course something like the WE 15A horn would be ideal - but giant horn, big bucks.

EDIT: I was thinking about your 240K:24R transformer. That's a winding ratio of 100:1, right?
It's surprising that there is enough voltage on the secondary to get anything out of the horn. Is that what you are using now?
I had a crystal set as kid, worked fine with headphones. Never thought about a horn and driver. Cool.

Right now im using a USI sound powered element with three UTC LS-37 transformers Wired for 300K to 1500 ohm .

Mark