[BC] HT-5

[Milton R. Holladay Jr.]

??? I said _any_ xmtr that uses those tubes. The filaments have design
issues and must be treated a bit differently from the 5000 or 15000 and are
generally less acceptable (not, to me.) Dogs, but definitely not  top dogs.
.The HT-5s were conversions,. Both had the grid resistor issue early on. The
one I've been called on to fix over the years has had many and various
problems and it's performance has always been barely on the edge of
acceptability. The old FM-3s had their POSness, but stayed on the air better
than these. You lead a charmed life.
The station with the HT-35 would have been off the air an embarrassisng
amount but for their BTF-20 aux..............
M
----- Original Message -----
From: <towers at mre.com>

> All due respect Milton, I've been servicing the HT3.5 series box for 20
> years and I've not had many problems with the box in general. The one HT 7
> I cared for didn't need much work either. And after the fire in a HT10
> (bad manufacturing issue related to a poor design since corrected), that
> TX seemed to behave well into an arguably funky filter load.
>
> While they are a PIA in some aspects to service, they're arguably the best
> low power tube TX Harris ever built. I've not needed to spend much time on
> any of them.  Nor has anyone I know.
>
> And since the cavity and socket is the same up through the 10K version, I
> think the same applies there too. The 4CX7500 tube isn't a top dog. But
> that's a TUBE issue.
>
> MM
>
> > I failed to say:  NEVER buy a xmtr that uses a 4CX 3500 or 4CX7500, as
you
> > will likely regret it, based on my experiences with
them.........5CX1500,
> > ditto.............
> > The 4CX20000D rebuilds I've seen lately have obly been lasting ~6
months.
> > Fortunately, there probably aren't too many new xmtrs using any of
these,
> > or
> > any tube at all........
> > M
> > ----- Original Message -----
> > From: "Milton R. Holladay Jr." <miltron at mindspring.com>
> >
> >> 4CX 3500 for the HT-5 and 3, (converted one, tuned another conversion)
> >> The HT-35 uses a 4CX20000D.
> >> M