Admiral 17T1 restoration
I'm just about done with a quick restore of an Admiral 17T1 I picked up recently. Really it's a 17T1 chassis in a 19A11 cabinet and a broken one at that.
Here it is in the previous owners basement along with a few other goodies. http://farm9.staticflickr.com/8378/8...13892920_c.jpg Doh! I had been crudely glued back together and the piece fell out as soon as I put pressure on it. Also, a small section is completely missing. http://farm9.staticflickr.com/8086/8...9f6d9fbb_c.jpg http://farm9.staticflickr.com/8513/8...54d24895_c.jpg I was surprised to find it had been recapped in the not to distant past and decided to power it up. http://farm9.staticflickr.com/8371/8...8164f699_c.jpg Check out that giant HV cap. It turned out to be a 0.05 uF - 10 times what the set calls for. http://farm9.staticflickr.com/8372/8...648d3270_c.jpg Well it sorta works with an unstable picture and weak sound. http://farm9.staticflickr.com/8098/8...04821189_c.jpg |
So I started poking around and quickly discovered two things.
One - The 17T1 chassis is not the same as the 19A1 in spite of what the Riders index states. Two - Some of the new orange drops were not the right value! With the correct schematic in hand, I went through and replaced all the bad components. http://farm9.staticflickr.com/8515/8...cfbc7551_c.jpg http://farm9.staticflickr.com/8248/8...ae890d85_c.jpg That got me a better image, but the sound was still bad. http://farm9.staticflickr.com/8091/8...1f247822_c.jpg So I fired up some gear and did an alignment. 3 MHz bandwidth isn't too shabby for a 7" set. The linearity is pretty good too. Sound is much better now but there is a little hum even with the volume all the way down. Perhaps that's normal ? http://farm9.staticflickr.com/8522/8...46422616c7.jpg http://farm9.staticflickr.com/8391/8...f2619f763a.jpg http://farm9.staticflickr.com/8226/8...ca477d054d.jpg I also installed a retrace blank and DC restoration modification. The picture is pretty good but I see some ringing on the left side :scratch2: http://farm9.staticflickr.com/8108/8...16a4b279_c.jpg |
If its not too much trouble what console is that in the center of your first picture? I an still thinking about getting one in st.louis this summer but I don't know anything about it. Good thing the owner said it wasn't going anywhere!
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Phil Nelson Phil's Old Radios http://antiqueradio.org/index.html |
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A friend stopped by last night and I fired up the set. His first comment was how loud the hum was from the speaker so I'll take a closer look. I wonder if it's connected to the warm transformer somehow ? All the electrolytics have been replaced and are running cool.
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I tried everything I could think of to eliminate or reduce the audio hum/buzz and gave up. If I turn the volume up enough, it's not that noticeable. I have a couple other similar 19A1 chassis to restore and I figure I'll compare their performance.
As for the damaged cabinet, I swapped it out for a black one I cleaned and polished a while back. It's still not the proper 17T1 "Chinese grille" cabinet, but it will do :yes: http://farm9.staticflickr.com/8254/8...f60b687a_c.jpg http://farm9.staticflickr.com/8530/8...14a729a9_c.jpg |
Very nice!
Regarding the audio, I wonder if some of that is simply normal vibration from the power transformer. Phil Nelson |
I never saw one with the 6Y6G. All the sets I had, had the 6AS5. They still used the 6SQ7, though.
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I'm going to be doing this exact same set for a friend in about a month, nice work! :)
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Here's what the cabinet and knobs should look like. http://www.bobandersen.com/images/mi...ral%2017T1.JPG Quote:
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What was the deal on the KNOBS of thease things ?!? A LOT of 'em I've seen have that white, nasty gunk all over 'em...
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The type of plastic they used breaks down over time into that white crud. I soak them in a some warm diluted 409 and it floats right off.
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Humidity and I think more importantly human contact, body oil, skin contact seems to me harbor the growth of that stuff. Acetate screwdriver handles in my basement get the same nasty growth. Stinks like vomit, just like Pridicta CRT face covers.
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