[Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII

Tue Nov 15 08:34:53 EST 2011

The first conversion oscillator is a 12BY7

Carl

----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <hallicrafters at mailman.qth.net>
Sent: Tuesday, November 15, 2011 7:48 AM
Subject: Re: [Hallicrafters] My First Boat Anchor Restoration: SX101 MkIII

I'm sure that he really meant 12AU7A, BUT the typing ability is like
many of us.  since they are sequential, he most likely meant 12, but
instead, landed on 23.

Jason - By doing the phono input, you have already tested the audio
stage by getting a hum.  While it doesn't indicate that it is up to
snuff, it DOES indicate functionality.

You will need the manual, and the test equipment to completely check it
out and get it up to full capability.

Work with your local ham, and/or some others to do this.

You will learn a lot, and learn where you can put your hands/test
equipment, and HOW to do this.

Bob - N0DGN

On 11/15/2011 7:36 AM, Mike Everette wrote:
> Jason,
>
> Did you actually mean to type "23AU7A" or was it 12AU7A?  If you actually 
> have a 23AU7A in the V13 socket, it's being fed only about half heater 
> voltage.  12= 12 volt filament; 23=23 volts (some weird series string TV 
> tube??).
>
> Better get used to working on high voltage.  If you are scared of it, you 
> really don't have much business sticking your hands in there.... Learn how 
> to do it safely.
>
> Isolate your signal source from the high voltage, using a capacitor.  A 
> 0.01 uF cap usually works well.  Be sure it's rated for at theast the 
> value of the B plus voltage.
>
> 73
>
> Mike
> W4DSE
>
>
> --- On Tue, 11/15/11, Jason Hissong<jhissong at gmail.com>  wrote:
>
>> From: Jason Hissong<jhissong at gmail.com>
>> Subject: Re: [Hallicrafters] My First Boat Anchor Restoration: SX101 
>> MkIII
>> To: hallicrafters at mailman.qth.net
>> Date: Tuesday, November 15, 2011, 12:41 AM
>> Quick update on my SX101 Mk *2* :)
>>
>> I worked with a local ham over the radio and he assisted me
>> in
>> troubleshooting the radio.  This is what I know:
>>
>> I plugged a pair of headphones in and tested the audio
>> stage.  I plugged
>> a phono cord into the back, switched the rig to "phono" and
>> touched the
>> tip of the phono plug to cause a hum.  I heard the hum
>> and the volume
>> control works.  However, when I turn the calibrator
>> on, and put the rig
>> to USB or LSB, and tune around, I don't hear the calibrator
>> at all.  I
>> did not have an antenna plugged in.
>>
>> I tested the 1st Conversion Oscillator (V13, 23AU7A) by
>> setting my TS450
>> to 7100kc + 1650kc = 8750kc, made a make-shift "antenna"
>> with a test
>> lead wrapped it around V3.  I turned the VFO knob up
>> and down the dial
>> and I heard the signal.  I tried this on 80, 20, and
>> 15 and heard it
>> there too (changing the TS450 frequency to the appropriate
>> frequency).
>> I did not hear one on 10M (I did not try it with 160M).
>>
>> I also tried testing the 2nd conversion oscillator (V12,
>> 12AT7) by
>> setting my Kenwood to 1600kc, set it to LSB, and wrapped
>> the lead around
>> V12.  I did not hear anything.  I tried it with
>> 1700kc and set the SX101
>> to USB.  Nothing.  I also tried it reversed in
>> case I messed it up.
>>
>> So this is where I am now.  The ham who was helping me
>> suggested I need
>> to inject a signal to the grid of each stage of the radio
>> and hear which
>> one does not work, starting from the audio stage all the
>> way to the
>> antenna.  I don't have a signal injector to do this.
>>
>> The other thing is, I am used to working on low voltage
>> stuff.  I don't
>> want to be putting this signal injector onto the wrong
>> thing and *poof*!!!
>>
>> 73, Jason N8XE (new boatachorologist)
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|               AM Amateur Radio Operator    NØDGN                 |
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