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Unitron 150 restoration thread

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#1 PawPaw

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Posted 14 February 2020 - 09:12 AM

I started the discussion on this thread:

 

  https://www.cloudyni...finds/page-333 

 

starting at post 8310

 

Found this, my first Unitron, 50 miles away.  The gentleman that I purchased it from won a bid on a storage unit and found this inside.  He said the storage unit is still crammed with items and he is only about 1/3rd way through it.  I am hoping he will find the legs and the mount that went with this scope.  We agreed that if he finds them I can have them for no extra $ from what I have paid for the OTA.  I will start a separate thread as I need some Unitron experts to help me out.  This OTA is very heavy.   I believe it must be brass with maybe weights inside the tube at the focuser end.

 

 

To keep from cluttering up the previous topic I will start here with what I found and my progress.  Already received help from several members on links and possible dates.  Although I would like a more definitive date of manufacture, fully understanding it can be impossible to get an exact date.  

 

Besides looking at the Lens with no markings and the tube itself having weights inside and being of Brass instead of Duralumin what other clues do you look for to assign a possible date or at least a built before date?  

 

Can the eyepieces give a clue?  The lettering on all the eyepieces are Gold in color.

 

 

 

 

 

 

 

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#2 G-Tower

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Posted 14 February 2020 - 09:15 AM

Brass tube is probably early 50's. The mount can be helpful to date it as well.



#3 PawPaw

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Posted 14 February 2020 - 09:20 AM

Brass tube is probably early 50's. The mount can be helpful to date it as well.

When you say early 50's do you mean before 1955?  The 150 model first came out in 1953 from what I have found....so far.



#4 Wisconsin Steve

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Posted 14 February 2020 - 09:21 AM

Post a bunch of pics of the scope and we can try and figure out a date range.

#5 G-Tower

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Posted 14 February 2020 - 09:24 AM

When you say early 50's do you mean before 1955?  The 150 model first came out in 1953 from what I have found....so far.

That's about right...Does the objective say 100mm ?


Edited by G-Tower, 14 February 2020 - 09:24 AM.


#6 PawPaw

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Posted 14 February 2020 - 09:30 AM

That's about right...Does the objective say 100mm ?

No the objective has no markings but the focuser does.......I will post several pics here for starters....Thanks for the help!

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Edited by PawPaw, 14 February 2020 - 09:33 AM.

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#7 PawPaw

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Posted 14 February 2020 - 09:45 AM

I am confident the mount that came with this is the Altazimuth Yoke mount  (Hoping for more good fortune that the mount and legs can be found) because of the mounting studs on the tube.  

 

 

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#8 Terra Nova

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Posted 14 February 2020 - 11:10 AM

Congratulations on a wonderful find!


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#9 Wisconsin Steve

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Posted 14 February 2020 - 12:45 PM

The red Milk Street address label inside the box would indicate mid 50s to late 50s to me. Notice there is no zip code.


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#10 PawPaw

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Posted 14 February 2020 - 12:59 PM

The red Milk Street address label inside the box would indicate mid 50s to late 50s to me. Notice there is no zip code.

It is a strange address......204-205 Milk St., Boston 9, Mass.........What is the 9 after Boston?

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#11 Kasmos

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Posted 14 February 2020 - 01:05 PM

It appears to be in excellent condition, especially considering its age. waytogo.gif   

 

My 114 has the same style eyepieces and it's a from around 1957-58, but it has plastic focuser and slow motion knobs. If memory serves me right, the metal knobs are on scopes from around '55-'56 and earlier. That said, It might be different for a 150. 


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#12 PawPaw

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Posted 14 February 2020 - 01:16 PM

Congratulations on a wonderful find!

Thanks Terra.......disassembly has begun.  The lens was previously removed by someone as it is missing 2 of the foil spacers.  I did not notice until I started removing the lens.   It easily was removed from the main tube without having to use a strap wrench.  Some good news is there is no oxidation of the cell mount on the main tube or the lens cell.

 

There are some small clam shells along the very outer edge but looking straight on they are harder to see.  I will be making new foil spacers.  More pics to come.

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#13 PawPaw

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Posted 14 February 2020 - 01:32 PM

Removing the lens from the cell.....

 

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#14 Ben H

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Posted 14 February 2020 - 01:32 PM

It is a strange address......204-205 Milk St., Boston 9, Mass.........What is the 9 after Boston?

Zip codes were introduced in 1963. Prior to that, in 1943 the USPS introduced postal zones for major cities, and the zone was listed after the city, not the state. Zones were also not unique to the city, so in addition to there being a Boston 9, there would have also been a Philadelphia 9, a New York City 9, etc.

Today 204 Milk St, Boston 9, Mass has become 204 Milk St, Boston, MA 02109. With very few exceptions the postal zone number was preserved as the last 1 or 2 digits as applicable of the new zip code. 


Edited by Ben H, 14 February 2020 - 01:35 PM.

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#15 PawPaw

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Posted 14 February 2020 - 01:49 PM

No markings on the edges of either the flint or the crown, not even register marks.  So my next step is to make some register marks (in case the current alignment is correct).  

The Flint (right picture) is in very nice shape

 

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#16 PawPaw

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Posted 14 February 2020 - 01:55 PM

Here is the Crown with the one foil spacer left.  You can see the small clams at 2 and 9 oclock.  I have seen worse....(Robert)....Time will tell but I don't think they will affect the image....Maybe I should blacken the edges?  Except for my register marks.

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#17 PawPaw

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Posted 14 February 2020 - 05:04 PM

Talking a break from the lens.......I don't want to make a mistake plus I am out of distilled water.

 

On to the tube.....I removed the focuser and found something heavy inside......A cast iron weight.  It is 3.5 inches long and fits between both internal finder bracket mountings.  

 

 

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#18 PawPaw

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Posted 14 February 2020 - 05:05 PM

Confirmation that the tube itself is Brass:

 

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#19 PawPaw

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Posted 14 February 2020 - 05:15 PM

This one has the standard focuser made out of cast aluminum with the # 60 stamped inside.  The end cap it screws into is very heavy not sure if it is aluminnum or cast iron.  

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#20 Wisconsin Steve

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Posted 14 February 2020 - 05:24 PM

That big nut inside the tube may have a set screw - mine did.


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#21 PawPaw

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Posted 14 February 2020 - 05:55 PM

The rack and pinion on focuser was a little loose.  So I removed it expecting to find a flexible spring or gib of some sort that applied pressure to take out slack.  Instead I found  only a solid block of what I believe to be bakelite and it you look closely it seems to have been carved with a rasp tool to fit the circumference of the focuser.  I cleaned up the old grease and simply applied slightly more pressure on the screws.  That applied more pressure on the pinion so now the foucsing tube stays in place when turned verticle.  

 

A simple yet elegant solution with no extra parts.

 

 

 

 

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#22 clamchip

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Posted 14 February 2020 - 06:19 PM

Here is the Crown with the one foil spacer left.  You can see the small clams at 2 and 9 oclock.  I have seen worse....(Robert)....Time will tell but I don't think they will affect the image....Maybe I should blacken the edges?  Except for my register marks.

Your making me hungry! although those are tiny seedlings.

I wouldn't worry about blacking those out. In fact, they almost look like they were

there when the lens was made, they are in the ground bevel.

Lucky you have that spacer to measure.

 

Robert


Edited by clamchip, 14 February 2020 - 06:21 PM.

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#23 PawPaw

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Posted 14 February 2020 - 07:24 PM

That big nut inside the tube may have a set screw - mine did.

Yes they do......All three of them.

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#24 CHASLX200

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Posted 14 February 2020 - 07:24 PM

When you say early 50's do you mean before 1955?  The 150 model first came out in 1953 from what I have found....so far.

They changed from the brass tube around 1957. My M160 was made around 1954. It was in very rough shape and the lens was to far gone. I had two weights inside that had the holes threaded so the guide scope and finder could be screwed on. This was before Uniclamps and before the Super focuser. 


Edited by CHASLX200, 14 February 2020 - 07:27 PM.


#25 starman876

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Posted 14 February 2020 - 07:57 PM

I still have a brass tube for a 150.  Have no clue what I am going to do with it.   Maybe someday I will take the guts out of a later model and out it into that tube.   Those weights in the back of the 150 OTA is so it will balance on the yoke mount.  




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