The Mountain
New Member
Hey all,
Just a quick sanity check before I jump into my project.
I am planning on a full recap and cleaning. This unit is in near perfect cosmetic condition. Barely even dust inside.
So, here is what I have right now:
Powers up, relay clicks, tuner pulls in some distant staions (although a little off on the tuning scale. For example, 98.5 tunes in at almost exactly 99.0)
Very low output. When the volume is all the way down, there is still audio in the right channel.
When at full volume, it is what I would expect at 10%...
I took some voltage readings. The 40 and -40 volt is fine (39.95).
Q17 reads fine. However, Q18 is odd. 24v on the base, 25.4V on the collector, and 25.4V on the emitter. The service manual states that the readings should mirror Q17, but negative.
Both TA7136's pin one show 25.4 instead of 10.4.
That's a couple of the readings that I have taken so far that have come up as odd.
Am I looking at a bunch of cooked parts, or am I missing something?
It has been many years since component level electronics in the Navy. I want to make sure I am not going to start recapping an un-fixable project.
Anyone want to chime in?
Thanks!
Just a quick sanity check before I jump into my project.
I am planning on a full recap and cleaning. This unit is in near perfect cosmetic condition. Barely even dust inside.
So, here is what I have right now:
Powers up, relay clicks, tuner pulls in some distant staions (although a little off on the tuning scale. For example, 98.5 tunes in at almost exactly 99.0)
Very low output. When the volume is all the way down, there is still audio in the right channel.
When at full volume, it is what I would expect at 10%...
I took some voltage readings. The 40 and -40 volt is fine (39.95).
Q17 reads fine. However, Q18 is odd. 24v on the base, 25.4V on the collector, and 25.4V on the emitter. The service manual states that the readings should mirror Q17, but negative.
Both TA7136's pin one show 25.4 instead of 10.4.
That's a couple of the readings that I have taken so far that have come up as odd.
Am I looking at a bunch of cooked parts, or am I missing something?
It has been many years since component level electronics in the Navy. I want to make sure I am not going to start recapping an un-fixable project.
Anyone want to chime in?
Thanks!