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 Post subject: Re: Admiral 20x122 scored
PostPosted: Feb Mon 27, 2012 4:57 am 
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fwdstuck wrote:
There was not any rust, the dust really protected the chassis.


That dust looks like Dryer lint, was this in a Laundry room by chance?


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Feb Mon 27, 2012 6:11 am 
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Location: Chicago, IL USA
Kevin and Bill are correct. Field coil 6" speaker with output transformer just as shown in Kevin's photo. There's also a 20X11 and 20X12 table top version that uses the same chassis and a 4.5" speaker

I might have some spare knobs if tvdude211 can't help you out. Sorry, no spare HV cage, speaker or 10BP4 :(

I agree with Tom, cheaper to liberate a 10BP4 from a junker set than buying one. They're going for $150+ lately on ebay :shock:

I've restored three sets with this 20X1 chassis and made a bunch of YouTube video series.
Here's a link to the beginning of the most popular one: http://www.youtube.com/watch?v=RskWnje7Ez8

Good luck!


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Feb Mon 27, 2012 6:29 am 
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Location: WI 54812
.


Last edited by Kevin Kuehn on Feb Mon 27, 2012 9:05 pm, edited 1 time in total.

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 Post subject: Re: Admiral 20x122 scored
PostPosted: Feb Mon 27, 2012 3:38 pm 
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Ah, don't worry about it. Maybe just my pain, and, exhaustion were talking.
Not a good week last week.
Sorry.
I need one of these speakers, too, and, I may just use my 4" speaker.
Bill Cahill
I have one working 4" spkr. from table model.

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 Post subject: Re: Admiral 20x122 scored
PostPosted: Feb Mon 27, 2012 9:04 pm 
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Understandable. Hope you get to feeling better.


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Feb Tue 28, 2012 2:10 am 
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Location: Whitwell, TN
Quote:
That dust looks like Dryer lint, was this in a Laundry room by chance?


It was dryer lint. The guy I bought it from, bought it from the daughter of the original owner. He bought it for resale to make a few bucks. So he didn't have it long. He said it was stored in a basement for a number of years, probably right next to the dryer. :?

I checked with Harry Poster and he said he would hook me up when he gets one. But I will still keep my eye out for a junker set untill then.

I'll keep my eye out for a 6" non-original field coil speaker to put in.

Hey tvdude211 have you found any knobs or a cage?


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Fri 02, 2012 2:38 am 
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I checked and cleaned all my pots tonight. They were all good. Just glad that the focus was good. :D I heard that these were bad to burn out.


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Fri 02, 2012 6:06 am 
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will look at work friday for you.


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Sun 04, 2012 3:09 am 
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I have been changing out a few caps and resistors tonight. Slowly but surely. :)


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 3:23 am 
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Trying to find a replacement for the speaker. I'm to use a PM speaker and a universal audio output transformer. The question that iv'e got is on the replacement of field coil. I'm going to use a filter choke in the place of it. The schematics calls for a 2.5 H 85 ohm DC .200A choke. Iv'e found some replacements, but there not right on spec. What is the most important part of the filter choke that needs to be right. Like i can find one that the 2.5 H but the DC resistance will be 43 ohms. Would that work?


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 3:39 am 
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The resistance is most important.
Bill Cahill

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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 3:44 am 
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I have heard that some people use a 5 or 10 watt power resistor in place of it. Would that work also?


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 3:47 am 
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25 Watt qould be safer, then, you need to add filtering. The choke filters some of the dc.
It will work, but, add capacity to your values.
Bill Cahill

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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 3:54 am 
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Ok, I see. I think i'll get a filter choke, and run it like original. I have already ordered my caps and they are the same value as the originals. I'll keep my a eye out for a filter choke that is close on the dc resistance.

I found a 156m hammond, 3 H, 100 MA, and 86 DC resistance. I think that will work.


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 4:39 am 
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The amperage is a little low, but, may get by. Not sure.
Original calls for higher current capabilities.
Bill Cahill

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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Mon 12, 2012 4:53 am 
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You could use a choke with lower resistance and add a series resistor to bring the total resistance up to the right value.

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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Sat 17, 2012 2:59 am 
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I finished recapping the set today. It was a run 6 chassis. So I done a bunch of mods to it to reflect the the latter runs of the chassis. So it would work the best it can. I'm still waiting on my speaker, choke, and audio output transformer to come in so I can power it up for the first time. It has the older 2 watt focus pot in it that what I have heard was bad to burn out. The latter ones were 4 watt. So I added a 1 ohm 2 watt resistor in series with it to protect that focus pot. I'm still waiting on finding 10BP4, HV cage, and some knobs. But I can still power it up and see if everything works once the speaker stuff comes in and maybe get some kind of image on the screen with that shot 10BP4 iv'e got now.


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Wed 21, 2012 1:00 am 
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Got my speaker, universal audio output transformer, and filter choke in the mail today. The filter choke i bought was a 2.5H 300MA 43ohms and I hooked up a 47ohm 10w power resistor in series with it. Powered it up for the first time today. I got a raster with the brightness turned all the way up. Still a little dim with that bad 10BP4. And no sound, it has very small buzz and hum, you can bearly hear. Time to do some troubleshooting.

I also checked my B+ and its around 385v instead of 365v.


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Fri 23, 2012 5:13 pm 
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Well I hooked up my vcr to it and I got sound, very poor, but no distortion . But still no picture. But a decent raster with retrace lines and with the brightness turned all the way up. That got me confused on the IF strip. That shows me the the If strip is working. Is it because I have the brightness turned all the way up and it whites out the picture? Or should I look other places?


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 Post subject: Re: Admiral 20x122 scored
PostPosted: Mar Fri 23, 2012 7:17 pm 
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Might be working, but, not well. Signal sounds like it's dying after second stage...
Sound take off is on second stagee.
Bill Cahill

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