#1
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Silvertone 1771
Almost finished with this radio, however it needs an alignment and the given data is a bit off. This model uses two 6j5's as the translator and oscillator instead of a single 6K8. The data lists the 6K8 on the alignment, which of the tubes do I need to inject the signal into?
this is what I've been using https://www.americanradiohistory.com...-1943-STU.pdf\ Thanks, Zach
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"If it isn't broke, you aren't trying hard enough" |
#2
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By translator you mean mixer right...there two types of tube superheterodyne one that uses a single tube self oscillating converter tube and and the other that uses a stand alone oscillator and a mixer to combine the carrier and local oscillator to get IF. You can inject at the mixer output. Also most superheterodynes will pass IF injected at the antenna.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#3
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It's just a typo. You inject the signal at the grid of the first 6J5, the mixer (the one the schematic refers to as translator).
This circuit gives a lower noise floor than a 6K8 mixer/osc would, so it should make a decent DXer. I have a Philco around here somewhere using a similar circuit but with a 14AF7 instead of two 6J5s. It works very well and seems to dig right into the atmospheric noise. |
#4
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Well, still no luck, It's receiving a single station at 790khz, but no others. There are other stronger stations in the area, so I believe the AVC is working. Any ideas?
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"If it isn't broke, you aren't trying hard enough" |
#5
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Check to ensure your local oscillator (6J5 #2) is oscillating across the band. I've had tuning caps with shorts at certain points in their travel. That'll kill your local osc.
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Audiokarma |
#6
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Well, it turned out to be simpler than I thought, one of the trimmer screws in the 1st IF stage seized up. It turned, however, it wouldn't turn all of the way to the end. It was just enough that it wouldn't pass a tuned signal. Fixed it and realigned it. Really a great performing set, I've been running it for the past few hours on my workbench while I work.
Not too bad looking of a set Silvertone 1771.jpg Interesting note, almost every resistor was +30% out of tolerance, weird to have so many like that. Almost thought it was my meter at first.
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"If it isn't broke, you aren't trying hard enough" |
#7
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You're probably a touch far away, but see if you can't pick up CFZM 740 AM from Toronto, or CKLW 800 AM from Windsor. Both still have relatively wide audio bandwidth and should sound exceptionally good on that radio... and the triode front end will help on the noise front.
Last edited by benman94; 11-08-2018 at 09:16 PM. |
#8
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Quote:
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"If it isn't broke, you aren't trying hard enough" |
#9
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Quote:
I was thinking of doing that way back when I lived in Florida, but I moved before I could do it...And an acquaintance was a bit of an asshole sabotaging one of my comparably rigged wires so anything not idiot proof was at risk.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#10
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I have a penchant for large outdoor loop antennas. You can null out an offending flamethrower when needed, and they're a little more manageable in rough weather than a long wire. Something to consider. I keep toying with building a 1 meter radius loop for shits and giggles...
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Audiokarma |
#11
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I've been musing with the idea of putting up a more permanent antenna for a few months, though nothing has come of it yet. My original intentions were to run a wire from the eve of the house to some trees. The given antenna would be somewhere around 100-150 feet at a height of about 30ft. Then again, I have to check with city ordinances to see if it's frowned upon. (We can't even have a clothesline) If it's not feasible, I'll most likely put some sort of directional loop
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"If it isn't broke, you aren't trying hard enough" |
#12
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In Florida, my neighborhood frowned on all antennas...So I put it up in the backyard a bit lower than the roof and no one noticed or complained.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#13
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I'm using an interior loop adjacent to a window. Where I live, I can put any kind of antenna up on the property. I use an outdoor roof-mounted yagi, mast amplified, for my ATSC. 20 channels! I'd love to install a beverage antenna of at least 300 meters long.
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Rick (Sparks) Ethridge |
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