Dear James,
Thank you for the reply. I would not undertake an RF alignment
on this tuner. What I would like to do would be to determine
if the the Intensity control "fix" was done properly and
attempt to get the correct parts, if necessary. The replacement
potentiometer is physically larger than the others and
a resistor is between it and the focus control and connected
to the .01 1kv capacitor to ground. The resistor does match
the construction of the other resistors in the unit, so maybe
it is supposed to be there.
The "spot killer" does appear to be functioning in, at least,
a rudimentary fashion. The trace does go away when the signal
or audio is not present. It appears that there is some dust
or other debris behind the front panel (quite dusty) so when
the front panel is removed for cleaning, the tube face can
cleaned and examined closer to see if any burn marks are truly
present. The area in question is not exactly at the center
so there may be hope.
Was the scope tube made especially for SAE or is it an
off-the-shelf item?
Best regards,
Paul Bigelow
--- In SAE_Talk@..., James Bongiorno <sstinc@e...> wrote:
Dear Paul,
I have all of the schematics for the Mark VI tuner however, I
hesitate in
sending out tuner information due to the fact that without
EXTENSIVE
knowledge, it is so easy to completely screw up the unit especially
if one
does not possess a complete RF laboratory. I have an extensive RF
lab,
probably the best in the country save for Dick Sequerra and Richard
Modaferi. As far as the knob goes, contact SAE's successor company,
ATI at
323278-0001 and ask for GALE. If there is any hope of finding the
correct
knob, she will know. In order for the scope tube to last a long
time it is
mandatory that the "spot killer" be adjusted properly. It sounds
like it is
not as you indicate some loss in the center of the tube. Please be
aware
that I do not believe that tube is available any more.
James Bongiorno
Paul Anthony Bigelow wrote:
Hello,
IMPRESSIONS
I just received my Mk VI tuner. Am I impressed!
Maybe my other tuners are garbage (probably) but
this tuner sounds great! It has many of the
sonic qualities of my Fisher 400 receiver tuner --
dynamic bass and terrific midrange without the
400's negatives -- distortion and rolled off highs.
It easily bests my other solid state tuners: Sansui TU717,
Yamaha T-7, T-2, Marantz 2110. Stereo imaging is
wide.
RF-wise the tuner is quite sensitive but does
have a slight problem with mixing products in my strong
signal area. Selectivity is good, not great (but
good enough). I can separate a STRONG station at
100.7 from a weak one at 101.1. If anyone on the
list is in Austin, that would be KASE in Austin and
KONO in San Antonio. My Yamaha T-2 may have better
performance in the mixing product area.
The build quality is quite impressive. All aluminum
cabinet and interior, neat, carefully bundled wiring.
All machined knobs. It looks to be rather easy to
service -- at least from an access point of view.
The tuning feel is remarkably smooth with no MECHANICAL
play although there is a bit of backlash from the
tuning belt arrangement. The tuning belt seems to have
survived the years well and is pliant with no signs of
deterioration, hardening, or cracking.
Electrical condition-wise the tuner has had work done
to it. The Brightness potentiometer was replaced and
a new knob substituted. It was tastefully done but
needs to be corrected. The nixies are nice and bright.
The scope appears to only have just a hint of slight
burn at the center. Not a hole, really, but *maybe* a
slight dimming of the trace. Everything appears to
work. The digital readout is accurate. The muting
works properly, the output level switches work. The
automatic switching from tuning display to audio
display by touching the tuning knob works.
Cosmetics-wise the panel has only the slightest scuff
on a small section of the top edge -- 1/4", maybe.
Hardly noticable. The lettering is perfect on both
the front and back panel.
QUESTIONS:
Does anyone have service information that could be
supplied/sold to me so that I can determine if the
brightness control repair was done correctly?
A schematic would do.
Would anyone have a spare (yeah, right) knob for the
brightness control they would like to sell? To make
a correct looking knob, however, would not appear to
be too difficult.
Would anyone have an owner's manual for scanning
or copying or, maybe, to sell?
I would be happy to answer any questions about this
tuner.
Best regards,
Paul Bigelow
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