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 Post subject: Emerson 544 Radio Reception Drifting
PostPosted: Feb Tue 12, 2019 9:53 pm 
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Joined: Feb Tue 12, 2019 9:34 pm
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I have an Emerson AM 110V Table top Radio Model 544. It has tubes: 12SA7, 12SK7, 12SQ7, 35Z5, and 50L6. It tends to drift off the station and I have to retune till the radio plays for at least 30 minutes plus and then it seems to hold there pretty good. It has been electronically restored. Sounds very good when on station. Picks up several stations but the drifting is very annoying. Is the problem with a particular tube or tubes? Need your help.
Frank
POST REPORT: Replaced the 12SA7 as "fifties" suggested. Cured my problem perfectly. Now I don't have to adjust the tuner all the time. THANK YOU


Last edited by radioeyetube on Feb Thu 14, 2019 9:52 pm, edited 1 time in total.

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 Post subject: Re: Emerson 544 Radio Reception Drifting
PostPosted: Feb Wed 13, 2019 3:54 am 
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Joined: May Sun 13, 2012 8:12 pm
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Location: Central PA 16801
were the mica capacitors and resistors in and around the oscillator and converter tube replaced ?

all sets have a small amount of drifting whilst they warm up from a cold state, but once they warm up, they should be stable given that all components are within and stay within spec.

I have seen mica capacitors, the resistor on the converter tube's plate, the converter tube itself, and a combination of the three cause a radio to drift up to 1/4 of an inch on the dial scale.

steve

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 Post subject: Re: Emerson 544 Radio Reception Drifting
PostPosted: Feb Wed 13, 2019 8:17 am 
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I'd suggest swapping out the 12SA7 if you have a spare, or can borrow from another set, and see if that cures it.

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 Post subject: Re: Emerson 544 Radio Reception Drifting
PostPosted: Feb Wed 13, 2019 8:39 am 
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Location: Northeast Florida
A one-time tube drift during warm-up isn't uncommon, and isn't a cause for concern. The characteristics of tubes change a tad once up to full operating temp.

I used to have a big Westinghouse am/fm table radio from around '48. It did not have AGC or AVC on fm, and tuning needed to be readjusted every 5-10 minutes

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 Post subject: Re: Emerson 544 Radio Reception Drifting
PostPosted: Feb Wed 13, 2019 10:11 am 
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tubes4life wrote:
A one-time tube drift during warm-up isn't uncommon, and isn't a cause for concern. The characteristics of tubes change a tad once up to full operating temp.

I used to have a big Westinghouse am/fm table radio from around '48. It did not have AGC or AVC on fm, and tuning needed to be readjusted every 5-10 minutes

That's not normal. None of mine do that.

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 Post subject: Re: Emerson 544 Radio Reception Drifting
PostPosted: Feb Wed 13, 2019 1:20 pm 
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How about using freeze spray on components, one at a time to see if you can locate the part. Of course, after changing the tube as a check.

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 Post subject: Re: Emerson 544 Radio Reception Drifting
PostPosted: Feb Wed 13, 2019 4:58 pm 
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Location: ZIP 23831 South of Richmond, VA 25 miles down the pike.
I would try another 12SQ7GT. Has C13 been replaced?

Bill J.


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