I think the oscillator is okay but I will take another look. If it's weak I'd expect no output on some frequencies, which isn't happening.
Bob
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--- On Fri, 12/21/12, Ken Greenough <g0wbm@...> wrote:
From: Ken Greenough <g0wbm@...>
Subject: Re: [hp_agilent_equipment] HP-608A Repair
To: hp_agilent_equipment@...
Date: Friday, December 21, 2012, 12:05 PM
? ----- Original Message -----
? From: Bob Albert
? To: hp_agilent_equipment@...
? Sent: Friday, December 21, 2012 6:02 PM
? Subject: Re: [hp_agilent_equipment] HP-608A Repair
? ?
? I am having attenuator problems also, with a Marconi
TF1066/4. The attenuator rack, made of plastic, had broken
because the generator had been removed from the case
carelessly. I repaired it with epoxy and the repair looks
very good. The attenuator moves smoothly and works well.
? However, the calibration is wrong. The output from
the generator is about 10dB less than the attenuator says.
The pickup coil is as far into the tube as it will go; any
farther and it contacts the coil. There is no means I can
see for rotating the pickup coil, so I am puzzled as to why
the output is low.
? I tried increasing the carrier level, assuming that
wasn't calibrated, but even at maximum the output is several
dB below the dial reading.
? Any ideas? This is a true boat anchor, and is way too
big and heavy for what it does. I want to get it working
properly so I can see about selling it. It has many great
features, and covers from 10 to 470 MHz, AM and FM and so
on. And it's a nice looking unit, with two big circular
dials with two pretty meters and light blue control knobs.
? Bob
? Hello Bob,
? Have you checked that the valves [ tubes] are in full
working order?
? If you're getting low output from the oscillator then
there's nothing the
? attenuator can do to compensate.
? 73 Ken g8beq
? Sorry to the group for the previous mail, I caught
send before I was ready.
? Happy Christmas to all.
?
[Non-text portions of this message have been removed]
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