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 Post subject: Help identify sweep tube in Silvertone TV
PostPosted: Oct Wed 28, 2020 4:08 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1400
Location: Orlando, FL, USA
I have a customer with a Sears Silvertone Medalist TV. There is a sticker on the back showing it as a model 6122, but it does not match the model 6122 shown on RMorg. The rectifier in this set is a 1AD2, which means the set was made in 1962 or later. The sweep tube is a 9 pin type, but it has been wiped clean. Can anyone pin down the likely tube type number?

Jim Cross


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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Wed 28, 2020 4:40 pm 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Detroit, MI USA
Need more info. Unfortunately Sears was well known to reuse the same model numbers, sometimes several times. You might find a couple of radios and a couple of TV's with model number 6122 over the years.

If they could supply you with the chassis number, which might start with 528. or some other source number, it would be easier to look up a schematic.

Failing that, if we knew what the damper tube was to determine filament current in the series string, and whether or not the output tube had a top cap, we might make an educated guess. It could be a 17 volt or 22 volt tube if this is a series string. By that time I don't think there were any more transformer powered tube type Silvertone black and white portables or consoles.

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Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Wed 28, 2020 5:44 pm 
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Location: Arvada, CO
Is it a Novar or a Noval? Also, does it have top cap? You can try measuring the voltage across tube too. I will try looking it up on Beitmans.

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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Wed 28, 2020 6:21 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1400
Location: Orlando, FL, USA
The sweep tube is a 9 pin compactron type with a top cap. It resembles a 6JF6, but I cannot be sure.

I will ask if there is a chassis number and what other tubes are in the set.


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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Thu 29, 2020 1:49 am 
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Joined: May Sun 07, 2017 11:35 am
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Location: Belrose, NSW, Australia
Can't find that part.

Is it like this?

http://tubedata.milbert.com/sheets/201/6/6AL3.pdf

Edit - no, the 1AD2 is an EHT rectifier for a color set

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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Thu 29, 2020 2:33 am 
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Location: Pewaukee, WI
irob2345 wrote:
Can't find that part.

Is it like this?

http://tubedata.milbert.com/sheets/201/6/6AL3.pdf

Edit - no, the 1AD2 is an EHT rectifier for a color set


Interesting...I was going to correct you that in the USA we always used 3V filament tubes (such at the 3A3 and 3AT2) as color HV rectifiers and always used 1V heater tubes (such as the 1B3 and 1X2) as monochrome HV rectifiers, but then I grabbed the schematic for my first chassis generation portacolor and spotted the 1AD2 HV rectifier in it... that is probably the only 1V heater HV rectifier I've seen used in the dozzens of color TVs I have owned spanning the entire tube/hybrid color era. Figures something as heavily cost reduction engineered as a GE portacolor would use such a rectifier... there's probably some monochrome sets that used the 1AD2 as well.


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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Thu 29, 2020 2:55 am 
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Joined: Jan Thu 01, 1970 1:00 am
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Location: Detroit, MI USA
Since the 1AD2 only has a PIV rating of 22KV, it couldn't be used in most color sets other than the cheaply engineered GE.

I recall seeing that tube in quite a few black and white sets, where it could operate within that limit.

The 1AD2 is simply the Compactron version of the popular 1J3/1K3 types.

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Experience is what you gain when the results aren't what you were expecting.


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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Thu 29, 2020 3:14 am 
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Joined: May Sun 07, 2017 11:35 am
Posts: 1149
Location: Belrose, NSW, Australia
In Australia the 1S2A was almost universally used in B&W TVs. I was surprised to find when I looked it up that it also has a PIV rating of 22kV with an absolute limit of 27kV. impressive for a smaller B9A tube.

One of the other features of the 1S2 was its indirectly heated cathode. This made for a more pleasing warmup performance of the TV - the scan circuits would have fully stabilized by the time the HV appeared, resulting in a picture that just shrunk onto the screen with no rolling or incomplete width or height.

The few designs that used the directly heated 1B3GT did not have this feature. Nor, for that matter, did later tube TVs fitted with selenium stick rectifiers.

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 Post subject: Re: Help identify sweep tube in Silvertone TV
PostPosted: Oct Thu 29, 2020 9:44 pm 
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Joined: Apr Sat 06, 2013 2:18 pm
Posts: 570
Location: New Hampshire
If you post that long model number you will probably get an answer.
The 4 digit # is all but useless. Look on the bottom, back, inside of back,
chassis. Its big & I have never seen one missing. Its almost definately
built by Warwick. IIRC Warwicks code is 528.######

73 Zeno 8)
LFOD !


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