[Boatanchors] GO9 Roller inductor cleaning

[Mark Foltarz]

Hi Ian,

   I put a TBW on the air. The TBW is the "mirror image" layout of a GO9.
   Built an external plate / screen  modulator with  an ART13 xfmr.

   I thought I hade to clean mine but apparently the silver oxide is a great
conductor. The inductors are all dark but work very well with no intermittant
readings on the plate meter even while tuning.

   I would concentrate on setting the contact wheel. However, if your silvering
is not there for what ever reason, you may have to  clean them anyways. 

  de KA4JVY

  Mark

   

--- Ian Wilson <ianmwilson at earthlink.net> wrote:

> I'm putting the HF section of a GO-9 on the air. Last night was the first
> time that I've had a chance to do any testing on the PA section (the MO and
> IA appear to be working well so far).
> 
> While tuning the PA (with *very* reduced voltage on the plate), it became
> obvious that the (two) roller inductors are making intermittent contact. I
> have used similar techniques to clean them that have worked successfully on
> ARC-5 roller inductors - i.e. a toothbrush with a slurry of BarKeeper's
> Friend, followed by wiping off any residue with damp paper towels, and
> drying well. The inductor wires are now a nice clear silver.
> 
> Have also cleaned the slider bars and the roller wheels, but these are still
> somewhat discolored. These appear not to be silvered, rather some sort of
> brass or other copper alloy. Suggestions for how best to clean these?
> 
> I don't think I can dismantle the inductors, so have to work with what I can
> see of them.
> 
> When tuning, I could see some arcing between the roller wheel and the
> inductor itself, so it may be that most of the problem lies with the wheel.
> 
> The spring mechanism that applies pressure to hold the wheel to the inductor
> appears to be weak on the PA roller inductor. The springs may have weakened
> over the years. Ideas for how to stiffen this up would be welcome.
> 
> Thanks for any help.
> 
> 73, ian K3IMW
> 
> 
> 
> 
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