On Jun 2, 2006, at 1:01 PM, George Watson wrote:
> I have an Ameritron AL1200 that a friend dropped on me which needs
> a bit of
> work and can likely be put back on the air.
> First the positives:
> 1. It powers up and the HV appears to be sound.
> 2. The tube appears to be good. I have run it up to about a KW
> briefly on
> 20, 40, and 80.
> Now the negatives:
> 1. The meter board has problems, the HV metering works, but the Ip
> has been intermittent. It has some burned components on it which
> continue to
> self digest.
> 2. The T/R relay is out. My friend wired it for an external one.
> 3. The Tune cap is pitted pretty badly and has some slagged edges.
> It arcs
> on the higher bands especially here at 2500m above sea level. It
> will need
Tune caps can intermittently arc from intermittent regeneration in
the region c. 100MHz -- and burned current-metering components go
hand in hand with intermittent arcing. Replacement is usually not
necessary if one uses a small flat file to smooth things up. An air-
variable Tune-C can look like hell and yet work well.
Does this AL-1200 have "neutralization" circuitry?
> 4. The bandswitch may be miswired.
Missing contacts from intermittent arcing are more likely. Ameritron
is a good source of replacement bandswitches.
> I think that about covers it. I would like $375.00 OBO + shipping
> which will
> be expensive.
$375 is a good price if the 3cx1200A7 is still usuable.
> I will break the amp into three boxes, one for the chassis,
> one for the transformer and one for the tube. I will have to purchase
> suitable packing material.
> Make no mistake, this is a restoration project of an amp with a not-
> certain history. From what I can tell, its fundamentals are sound.
> I simply
> don't need the amp for operating and I don't have time (despite all
> intentions) to do the restoration.
> If I do not get a reasonable offer by 1800MDT, Sunday, I will plop
> the beast
> on E-bay.
> Thx es 73 de K0IW
> George K. Watson
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