[NJARC] Service manual needed for Sears Roebuck 1423 Guitar Amplifier

Chuck cpaci1 at verizon.net
Mon Jan 9 07:25:21 EST 2017 

Hi and Happy new year everyone!...
I am also in need of a service manual that I haven't been able to find.
Does anyone know where I might find the service manual for a Sears LA 35 
solid-state guitar amp?
Model number 257.14235800 - (see attached)
I tried several combinations of this number, but only got a hit on Sears 
Silvertone 1423 and this is not the right schematic!
Any ideas where I might find one would be much appreciated.
See you at the next meeting.
Thanks,
Chuck
AC2DP


-----Original Message----- 
From: Al Klase
Sent: Saturday, January 07, 2017 1:14 PM
To: njarc at mailman.qth.net
Subject: Re: [NJARC] Service manual needed for Panasonic RF-888

Just remember
Reply = Poster
Reply All = Everyone

_________________________________________________________
Louis,

First off, there's a Panasonic Portables group on Yahoo that you might
find helpful.  That's were the manual came from:
https://groups.yahoo.com/neo/groups/panaport/conversations/messages

I wouldn't try to modify the circuitry.  Matsushita had excellent
engineers, your chances of outguessing them are quite slim.  If they
went from germanium to silicon, it almost certainly improved things.
The PNP to NPN switch will scramble the circuit polarities and bias
resistor values.

If the radio play, leave it alone.

Al

On 1/6/2017 11:58 PM, Louis wrote:
> Just remember
> Reply = Poster
> Reply All = Everyone
>
> _________________________________________________________
> Thanks Al, Joe and Aaron for the help. I had looked and looked for a 
> manual and found others have also inquired about a service manual for the 
> RF-888 w/o any success. Al, you did your homework but - there's always a 
> fly in the ointment, this fly is called, "Panasonic".
>
> The saying that a rose by any other name is still a rose doesn't apply to 
> Panasonic radios, even if they look alike. I have the "RF-888", you 
> provided me with a manual for the "RF-888JB" but wait, there's more! 
> There's also the RF-888LP and the Cougar RF-888 and National Panasonic 
> GX-300 - all basically the same model, different circuitry!
>
> I had stumbled onto this a few days ago by looking at all the web pages 
> with 888 models, lots and lots of them. Think it was RadioMuseum that 
> showed the circuitry of the GX-300 (888JB) it shows two TO-66 style 
> transistors (2SB473 - Germanium PNP) heat sinked by a large piece of 
> aluminum on one board. The RF-888 I have has two TO-126 style transistors 
> (2SC1568 - Silicon NPN) sinked by, ah, a piece of tin foil by comparison. 
> I think they upper the output wattage for the speaker on those other 
> models. Might I be able to get more gain and up my speaker's output 
> wattage or is this not recommended/easy to do?
>
> However, I do believe the manual you found will allow me to adjust the 
> dial scale film on my radio but I will have to look closely at the 
> circuitry before I attempt anything else. Panasonic made some great 
> radios, but each model could have different bands depending on the country 
> it was sold in and therefore different circuits too.
>
> Thanks all.
>
> njarc-request at mailman.qth.net wrote:
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>> Today's Topics:
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>>    1. Re: Service manual needed for Panasonic RF-888 (Aaron Hunter)
>>    2. Re: Service manual needed for Panasonic RF-888 (Al Klase)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Thu, 05 Jan 2017 19:47:59 -0500
>> From: Aaron Hunter <ahunter01 at comcast.net>
>> To: Louis <louis2000 at att.net>
>> Cc: njarc at mailman.qth.net
>> Subject: Re: [NJARC] Service manual needed for Panasonic RF-888
>> Message-ID: <586EE93F.1040701 at comcast.net>
>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>
>> Looked in the Sam's index, but this model is not listed.
>>
>> Aaron Hunter
>>
>> Louis wrote:
>>> _________________________________________________________
>>> Just picked up an RF-888 and it needs to be disassembled for cleaning 
>>> and repair. I couldn't find a S.M. on eBay so if anyone has one, 
>>> especially if it's already digitized (have one on paper? I'd buy it from 
>>> you) let me know. If anyone has disassembled one to adjust the frequency 
>>> readout ribbon (it's way off) let me know what this entails, thanks.
>>> ______________________________________________________________
>>
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Thu, 5 Jan 2017 20:49:50 -0500
>> From: Al Klase <ark at ar88.net>
>> To: njarc at mailman.qth.net
>> Subject: Re: [NJARC] Service manual needed for Panasonic RF-888
>> Message-ID: <ebccc7c4-b735-5cb5-4315-be06d52018a6 at ar88.net>
>> Content-Type: text/plain; charset="windows-1252"; Format="flowed"
>>
>> A little creative Googling, and I got luck.  See attached. - Al Klase
>>
>> On 1/5/2017 7:47 PM, Aaron Hunter wrote:
>>> Just remember
>>> Reply = Poster
>>> Reply All = Everyone
>>>
>>> _________________________________________________________
>>> Looked in the Sam's index, but this model is not listed.
>>>
>>> Aaron Hunter
>>>
>>> Louis wrote:
>>>> _________________________________________________________
>>>> Just picked up an RF-888 and it needs to be disassembled for cleaning 
>>>> and repair. I couldn't find a S.M. on eBay so if anyone has one, 
>>>> especially if it's already digitized (have one on paper? I'd buy it 
>>>> from you) let me know. If anyone has disassembled one to adjust the 
>>>> frequency readout ribbon (it's way off) let me know what this entails, 
>>>> thanks.
>>>> ______________________________________________________________
>>> ______________________________________________________________
>>> NJARC mailing list
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-- 
Al Klase – N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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