When will I ever learn? (SB-101)

[Tom Chesek]

When I start with an old radio (Heathkit mainly) the first things that I do 
is clean all contacts and controls as well as pull all tubes and test them 
on my tube tester to weed out any obvious bad tubes. I then use contact 
cleaner on the tubes and sockets while reinserting the tubes. I also loosten 
and retighten all screws and nuts since many are used for ground paths. More 
times than not this brings the radio back to life.

The full manual and schematic, 17 mb in size, is available for download at 
www.ebaman.com. You must create a free account. To find the files go to 
"files area", "search repository", then type in SB-101. The full manual is 
available in PDF format.

Tom K3TVC


----- Original Message ----- 
From: "Kenth B Astrom" <kenth at TOTOKET.COM>
To: <HEATH at LISTS.TEMPE.GOV>
Sent: Monday, March 08, 2010 8:51 AM
Subject: [HEATH-TEMPE] When will I ever learn? (SB-101)


> Dear Team,
>
> Ok, just picked up this cosmetically perfect SB-101 off eBay, heck the ad
> even showed it 'lit up' and with "all tubes seems to glow"....."not tested
> but picked up from a relative".....which seems to be the norm for DOA.
>
> At any rate, it passed the smoke and smell test using a variac but that's
> just about it.
>
> Plugged in antenna and headphones to see if I could pick up some sigs on 
> 20
> but to no avail. Very quiet.
>
> So I switched on the built in calibrator 'CAL' and started to sweep up and
> down to pick up the loud calibration signal, but not even that was heard
> anywhere across the band.
>
> Next trying to get it to tune up a few watts, I swithed it to 'TUNE' and
> started janking the preselector and final tune knobs - nothing. Does not
> even show plate current, grid current or 'HV' on the meter, when its
> switched to those positions.
>
> Now starting to suspect the PS, I switched to another HP-23 that I have
> sitting on the shelf and that I know is working. To no avail - same
> depressing result.
>
> From what I remember from my electrical engineering and tranceiver theory 
> in
> school (looong time ago..) since it neither receives nor transmits, it 
> must
> have something to do with circuitry common to both of those functions,
> right?
>
> I would not even know where to start, so any help would be greatly
> appreciated. Does anyone even have a circuit diagram for this baby?
>
> Lesson learned (again..) about picking up vintage stuff off eBay....
>
> Thanks in advance!
>
> Regards / 73 de
> Kenth / W1JKP

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