When will I ever learn? (SB-101)

[Kenneth G. Gordon]

Sound like your LMO is not working. Or perhaps the 
heterodyne oscillator.

Most probably, the LMO.

Has the connection to the back of the LMO fallen out?

Ken Gordon W7EKB

On 8 Mar 2010 at 8:51, Kenth B Astrom wrote:

> 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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