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S-40a speaker

 

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The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock.
 
Edited

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Richard, and anyone else

As to the first S-40 speakers being a carry-over from the S-22R.. I found this:

The s-20 appears to have an electrodynamic ?speaker…. with a hum-bucking coil .. and? with ?phones powered thru a cap connected to the plate.

The s-20R appears to have a PM speaker …. And with ?phones powered by the output transformer.

I don’t think I found evidence of any S-40 ?speaker…. with a hum-bucking coil ..

For anyone too young most of my 1930’s consoles had ?hum-bucking coil …I think

?

The sams stuff on bama ?for “s-40” shows a PM speaker.. maybe dwg is for some 40A’s or the 40B .. who knows?

The sams stuff on bama ?for “s-40A” shows a PM speaker.. ?

But now it is late but an s-40techman? shows s-40A with an electrodynamic

Cant see any manual for an? orig? S-40

?

this^^ riders shows …

the S-40 rev1 [lower in pic] with a ??5 prong plug to the PM speaker

the s-40 rev2 [top in pic] with a PM speaker and no plug ??

this seems to contradict your statement,, but they do call them rev1 and rev2 …cant see a no-rev schematic

…but then there is this next speaker? ?=ED?????? Pic of ?Front of cab has “S-40”

?

any thoughts?? ?

?

see attached ?…seems that Jensen is just pushing Alnico5 in april ’45.. a bit early ……..

worn out too much searching?

73 don VA3DRL

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of Richard Knoppow
Sent: Thursday, January 12, 2023 5:45 PM
To: [email protected]
Subject: [HallicraftersRadios] S-40a speaker

?

The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock.

???????? =======end===

?

_._,_._,_
 

On Thu, Jan 12, 2023 at 02:45 PM, Richard Knoppow wrote:
The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock.
Richard and any listeners-in
the BAMA? S-40Sams?? seems to be for those units? before the A version.
the parts list shows an electrodynamic speaker. then goes on to say later ones were PM.
If this is really for the "S-40" I wonder why the A version used any ED's
by the way.. for anybody this "manual" has lots of good pictures
at the last there are two hard to read pages re changes ..including the speaker
I saw nothing about A or B versions in here.
73?? don
 

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What I have was published by Hallicrafters,? not Sam's
? The earliest model was the S-40, the S-40A is a later model.? The S-40-B is redesigned and has significant differences from earlier models.? It was evidently intended to be cheaper to build but i suspect it has better performance






-------- Original message --------
From: don Root <drootofallevil@...>
Date: 1/14/23 7:20 PM (GMT-08:00)
Subject: Re: [HallicraftersRadios] S-40a speaker

On Thu, Jan 12, 2023 at 02:45 PM, Richard Knoppow wrote:
The service bulletin fir the S-40a says that a field coil speaker was used in the first 1000 units. A PM speaker was used in subsequent production.? I compared the part number with the S-20R, they are different.? I thought perhaps they were using up surplus stock.
Richard and any listeners-in
the BAMA? S-40Sams?? seems to be for those units? before the A version.
the parts list shows an electrodynamic speaker. then goes on to say later ones were PM.
If this is really for the "S-40" I wonder why the A version used any ED's
by the way.. for anybody this "manual" has lots of good pictures
at the last there are two hard to read pages re changes ..including the speaker
I saw nothing about A or B versions in here.
73?? don

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