Heathkit 401-21

[Tom Chesek]

My 1984 Parts Master File says 3.2Z 1.5W and 3.5 square for the 401-21.

Tom K3TVC



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From: "Emil Dular" <wd4scz at AOL.COM>
Sent: Thursday, April 22, 2010 1:38 PM
To: <HEATH at LISTS.TEMPE.GOV>
Subject: [HEATH-TEMPE] Heathkit 401-21

> I've got Gonset IV with a bad speaker, voice coil is open. It is a 3.2 ohm 
> 3.5 inch square, Gonset part number 152-017.  The size is tough enough to 
> find, but the original has an ALNICO magnet and all the possible modern 
> replacements I can find have the big round ceramic magnets. The problem is 
> that the big new type magnet will not fit.  I don't know who made the 
> speaker for Gonset in 1961 but there is SP-CO-243 printed on the backside 
> of the cone.
>
> Anyway, it sure looks like the speaker in an Heathkit signal tracer would 
> fit the bill. I think they used speaker part number 401-21 in all of them 
> from the T-3 to the  IT-12.  Anyone know what impedance it is?
>
> So anybody have a good speaker that will fit and they will sell?
>
> 73 es tnx Emil WD4SCZ
 

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