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Unitron 131-C

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#101 terraclarke

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Posted 12 March 2013 - 03:32 PM

Looking good. Shines up like new baby!

:waytogo:

#102 Dave M

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Posted 12 March 2013 - 03:35 PM

Thanks! Terra :flower:

#103 akman1955

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Posted 18 March 2013 - 04:01 PM

reportedly 100 131C's
None of the 131C's I have are with a green lens. I was hoping because rumor had it they were made by Pentax.



I have had 3 131-c and two I still have are green tinted lense. the polarex the brian has was not green tinted...also the 132-c I had was green tinted to and bought that in 1980

#104 akman1955

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Posted 18 March 2013 - 04:07 PM

one of my green tinted ones has a number on lense..the other does not but both green tinted

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#105 akman1955

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Posted 18 March 2013 - 04:08 PM

other one powdercoated mistic purple

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#106 terraclarke

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Posted 18 March 2013 - 04:22 PM

You are gonna love that eq. mount Dave. It is the same as on my Model 128 except with a heavier counter weight (yours). It is smooth as butter and rock solid. I am going to get the clock drive for mine next month, in time for summer observing. If you decide to get the clock drive, you need the one for the 128 (60mm) not the 142 (76mm).

#107 Dave M

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Posted 18 March 2013 - 05:38 PM

Thanks for posting that info John, thats interesting, makes me wonder how many had the green lens. Nice scopes ..
Mine came with two different length tubes that go into the focuser drawtube, not sure of the purpose of that.?

Terra, Thanks for the info on the drive, i wasnt aware there was two models. I been thinking about adding one sometime this summer. I should have this gem ready to see light again soon, i just finished up the Unihex, took it apart and cleaned it, cleaned the little spring and ball bearing, lightly re-lubed it. It now works like new, clicks right into each position now :cool: ..
Next up is the tripod and cleaning the focuser..

#108 akman1955

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Posted 19 March 2013 - 07:56 AM

:)Dave different length draw tubes allow you to focus different eyepieces(higher power need longer drawtubes)...They also only made 100 of the 75mm compacts and 25 of the 100mm compacts.

#109 akman1955

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Posted 19 March 2013 - 07:58 AM

:)Dave, here is what original box looks like..

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#110 starman876

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Posted 19 March 2013 - 03:13 PM

if you also look closely you will see that the 131C has the deluxe 75mm focuser.

#111 Dave M

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Posted 20 March 2013 - 10:38 AM

Thanks John, :) thats what i thought about those tubes since they each have a eyepiece adapter on them, but i wasnt 100% sure about it.
Appreciate the box image, if you get a chance could you please post the measurements of the box ?.

Thanks Johann, i keep learning more and more about these scopes thanks to all the fantastic members here. :D

#112 Dave M

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Posted 21 March 2013 - 09:18 PM

Anyone know what kind of metal the Unitron tripod spreader bar/tray is made of ?
Looks a gold color..

#113 TOM KIEHL

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Posted 21 March 2013 - 09:19 PM

TRY a magnet on it dave

#114 Dave M

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Posted 21 March 2013 - 09:23 PM

Tried it, its magnetic..

#115 TOM KIEHL

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Posted 21 March 2013 - 09:31 PM

Well then it's not GOLD, it maybe gold colored, and cost as much as gold , but it must have some iron it, ide say it is cad. plated or zinc plated... :question: :lol: :lol:

#116 Dave M

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Posted 21 March 2013 - 09:58 PM

Somehow i knew the GOLD comment was coming :lol:
Mine spreader tray has a couple dark spots, maybe rust.
Wonder whats the best way to clean or restore it.

#117 Dave M

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Posted 21 March 2013 - 10:03 PM

Well, i found this, so it looks like your right about the zinc plating.
http://www.yellowzincplating.com/

#118 starman876

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Posted 21 March 2013 - 10:11 PM

Or you could get a new one. I have heard rumors of someone that has them :grin:

#119 TOM KIEHL

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Posted 21 March 2013 - 10:14 PM

Somehow i knew the GOLD comment was coming :lol:
Mine spreader tray has a couple dark spots, maybe rust.
Wonder whats the best way to clean or restore it.

Well without getting too agressive with cleaning, Why not try that real fine polishing compound you have?? :shrug: :shrug: :pulpdnc: :pulpdnc: :rollgrin:

#120 Dave M

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Posted 21 March 2013 - 10:30 PM

I did, it helped but the spotting is still there.
Tomorrow i`ll add a image to this post.

edit :)
Here`s the tray, its not that bad, mainly just has a little corrosion along the bottom crease in the tray and around a couple rivets, and a couple spots on one of the arms.
It probably wouldnt bother most people, but me thats another story :grin:

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#121 snork

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Posted 21 March 2013 - 10:34 PM

Re-plating would be the best. The plating is only about .0003 thick so as Tom said any aggressiveness will remove the plating. If the spots are rust then the plating has failed in those spots. It can be re-plated inexspensively.

#122 Dave M

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Posted 21 March 2013 - 10:59 PM

Thanks! Dan, ide agree on the replating. I`ll send you that image tomorrow, its really not bad, but replating would restore it back to that new look :)

#123 PiSigma

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Posted 22 March 2013 - 08:48 AM

Yes, they are yellow zinc plated. I recently stripped the ones on my 145C and had them replated.

#124 Dave M

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Posted 22 March 2013 - 08:55 AM

Jon, how did you strip/prep yours before recoating ?
Just fine sanding ?

#125 PiSigma

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Posted 22 March 2013 - 12:25 PM

I bead blasted mine at work but most platers will also strip them for you (for an additional charge of course). Our race shop has had a lot of classic telescope parts pass through it. :lol:






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