[Boatanchors] SX25 Hallicrafters

[Joe Connor]

Was the PM-23 the correct speaker for the SX-25? The PM-23 has an impedance of 5K Ohms. I'm curious if there is any reason why Hallicrafters chose 5K as one of the two output impedances on the SX-25 and SX-28. Was it a marketing decision to help sell PM-23 speakers? It seems to be pretty unusual to find one of these receivers with the original speaker. 

Joe Connor



On Friday, March 7, 2014 4:35 PM, David Knepper <collinsradio at comcast.net> wrote:
 
I have an SX-25 without the matching speaker.  I use a step-down transformer 
>from 600 ohms to 4 ohms to drive a conventional speaker.
>
>I would love to have the matching speaker.
>
>David Knepper - W3CRA/W3ST
>Collins Radio Association
>www.collinsra.com
>Join the CRA today
>-----Original Message----- 
>From: David Knepper
>Sent: Friday, March 07, 2014 4:20 PM
>To: wq9e at btsnetworks.net ; rbethman at comcast.net ; 
>boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] SX25 Hallicrafters
>
>The SX-25 needs a matching transformer for its 500 or 5000 ohm impedance
>audio output.
>
>David Knepper - W3CRA/W3ST
>Collins Radio Association
>www.collinsra.com
>Join the CRA today
>-----Original Message----- 
>From: WQ9E at btsnetworks.net
>Sent: Friday, March 07, 2014 3:56 PM
>To: rbethman at comcast.net ; boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] SX25 Hallicrafters
>
>Hi Bob,
>
>I think the best motto when comparing a Hallicrafters receiver to its
>schematic is, "expect the unexpected"  :)  Even within a series there are
>often discrepancies.  I can say that my SX-88 seems to perfectly match the
>schematic in the original manual that came with it but it still provided a
>little Hallicrafters amusement.  Because the SX-88 was their high dollar
>model every connection had a little red dot of inspection paint put on after
>soldering.  One of the coil lugs for the highest range had the nice red
>inspection dot but no actual solder :)
>
>I didn't see your reply to the list prior to replying to Rob's email.
>
>Rodger WQ9E
>
>-------- Original Message --------
>> From: rbethman <rbethman at comcast.net>
>> Sent: Friday, March 07, 2014 2:47 PM
>> To: boatanchors at mailman.qth.net
>> Subject: Re: [Boatanchors] SX25 Hallicrafters
>>
>> List,
>>
>> I looked at ONE schematic for the SX-25.
>>
>> I didn't search my archives for "sub" Model schematics.
>>
>> The long history of the Hallicrafters substantial "sub" models is an
>> ever present reminder to - First provide the initial confirmation of the
>> first schematic.
>>
>> Later models, if the information *is* available may "then" be looked for
>> *if* we are made aware of perhaps the simple ink stamp on the chassis
>> that would indicate the "sub" model.
>>
>> Sincerely, Regards,
>> Robert "Bob" Bethman
>> N0DGN
>>
>> On 3/7/2014 3:26 PM, WQ9E at btsnetworks.net wrote:
>> > As Rob indicated, my SX-25 uses a pair of 6F6 tubes, the similar but 
>> > simpler SX-24 has a single 6F6.  Maybe they changed later production to 
>> > the 6V6.
>> >
>> > Rodger WQ9E
>>
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>
>
>
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