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Thoughts on these specs?

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16 replies to this topic

#1 Speedy1985

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Posted 14 October 2021 - 04:29 PM

If you saw specs like these for a PVS14, what would you think?

 

PC Response 2400
SNR 32-35
Gain 65000-80000
Resolution 73+
Halo .7 or less
EBI   .7 or less

Low Milspec spots



#2 GOLGO13

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Posted 14 October 2021 - 04:35 PM

Looks pretty good. Find out more about the spots
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#3 Speedy1985

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Posted 14 October 2021 - 04:40 PM

Looks pretty good. Find out more about the spots

Are these something that can be controlled? I was told they would follow the milspec tolerance. 



#4 GOLGO13

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Posted 14 October 2021 - 04:43 PM

Are these something that can be controlled? I was told they would follow the milspec tolerance.


I don't know about that. Usually they tell you different zones and if they are in the center or not.
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#5 stnagy

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Posted 14 October 2021 - 04:48 PM

You could ask for a photo of the spots, too. Sometimes sellers will provide something like this so you can see before you buy:

 

https://tse2.mm.bing...YBqVatXFK-wHaJ4


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#6 Speedy1985

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Posted 14 October 2021 - 04:49 PM

I don't know about that. Usually they tell you different zones and if they are in the center or not.

I should clarify that they tubes are not in hand yet, so they don't know. So to spill the beans, I've been talking to one of the vendors about a PVS14. After some research and good back and forth info, the rest of these were the spec ranges I requested. The milspec comment is basically what I was told, without confirmation until they arrive. Obviously I'm going to request as few as possible. 



#7 stnagy

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Posted 14 October 2021 - 05:01 PM

You can specify spot size in inch ranges (e.g., >0.009, 0.006-0.009, 0.003-0.006) and zones (1, 2, 3). Zone 1 is the center 20% or so, zone 3 is a strip around the edge, and zone 2 is everything else. I don't think most places count spots smaller than 0.003 inches. Just ask what they mean by milspec. They are probably referring to an upper limit on spot sizes in each zone.

Edit: Oh, and you can always ask for specific specs that exceed their limits if you want.

Edited by stnagy, 14 October 2021 - 05:03 PM.

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#8 Speedy1985

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Posted 14 October 2021 - 05:14 PM

You can specify spot size in inch ranges (e.g., >0.009, 0.006-0.009, 0.003-0.006) and zones (1, 2, 3). Zone 1 is the center 20% or so, zone 3 is a strip around the edge, and zone 2 is everything else. I don't think most places count spots smaller than 0.003 inches. Just ask what they mean by milspec. They are probably referring to an upper limit on spot sizes in each zone.

Edit: Oh, and you can always ask for specific specs that exceed their limits if you want.

I was going to ask for low spots, small size(I'll request .003-.006) and minimal in zones 1 & 2 at least. 



#9 stnagy

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Posted 14 October 2021 - 06:04 PM

I was going to ask for low spots, small size(I'll request .003-.006) and minimal in zones 1 & 2 at least.

Go with none in 1 and 2 if you can. I think milspec might allow one small spot in 2, but you can find tubes with none in 2 (and 3 also).

Edited by stnagy, 14 October 2021 - 06:05 PM.

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#10 Speedy1985

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Posted 14 October 2021 - 06:19 PM

Go with none in 1 and 2 if you can. I think milspec might allow one small spot in 2, but you can find tubes with none in 2 (and 3 also).

I basically asked for the best possible. With all of the other specs I asked for, it may be a tough bill. 



#11 maxmir

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Posted 14 October 2021 - 07:17 PM

I got my NV from Kosher Surplus after Placing my deposit with TNVC.

 

Kosher had a several tubes LG filmless PVS14s for immediate delivery

 

I got from Kosher two days later :

 

Pefect tube without defects

PCR 2500

SNR 34.7

LP 72

EBI 0.6

Halo 0.7

 

My friend took over the TNVC deposit.

 

I asked for :

PCR >2400

SNR >35

LP 72

EBI < 0.5

Halo 0.7 No defects

 

They filled his order at 20 weeks

 

He got :

 

Pefect tube without defects

PCR 2150

SNR 34.7

LP 72

EBI 0.4

Halo 0.7

 

I have a chance to do a little observing with his TNVC.

Looks just like mine at first viewing.

I will have a detailed side by side comparison next time we get together observing


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#12 chemisted

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Posted 14 October 2021 - 07:20 PM

CN member maxmir reported that he was very pleased with the device he purchased from Kosher Surplus.  Have you looked at their website?  I just checked and they seem have inventory that possibly checks all your boxes.  They even show tube spot diagrams and list a variety of specs.  For example their stock #1800 seems to meet your needs.  I would check it out.


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#13 Speedy1985

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Posted 14 October 2021 - 08:16 PM

I got my NV from Kosher Surplus after Placing my deposit with TNVC.

 

Kosher had a several tubes LG filmless PVS14s for immediate delivery

 

I got from Kosher two days later :

 

Pefect tube without defects

PCR 2500

SNR 34.7

LP 72

EBI 0.6

Halo 0.7

 

My friend took over the TNVC deposit.

 

I asked for :

PCR >2400

SNR >35

LP 72

EBI < 0.5

Halo 0.7 No defects

 

They filled his order at 20 weeks

 

He got :

 

Pefect tube without defects

PCR 2150

SNR 34.7

LP 72

EBI 0.4

Halo 0.7

 

I have a chance to do a little observing with his TNVC.

Looks just like mine at first viewing.

I will have a detailed side by side comparison next time we get together observing

Considering that the only real difference in the 2 is that your friend got a slightly lower PCR and slightly better EBI. If they are similar in views, then those few extra points here and there don't seem to offer anything in the way of significant benefits. I'm sure there is a point at which there are diminishing returns in the views. 



#14 Speedy1985

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Posted 14 October 2021 - 08:25 PM

CN member maxmir reported that he was very pleased with the device he purchased from Kosher Surplus.  Have you looked at their website?  I just checked and they seem have inventory that possibly checks all your boxes.  They even show tube spot diagrams and list a variety of specs.  For example their stock #1800 seems to meet your needs.  I would check it out.

I did take a look, and they do seem to have some good units. Their cost would be in line with others when it comes to the specs. Right now, I'm happy with the vendor and rep I am communicating with. They are willing to take no payment up front and try to find a tube with my requested specs or better, with no obligation to buy if they can't. I can keep the order open until they do find one, or cancel before it is assembled.  



#15 maxmir

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Posted 14 October 2021 - 09:44 PM

All I know is Ben at Kosher Surplus took good care of me.

I know he is gets his tube supply directly from L3/Harris and Ebit.

Note: His web site often does not reflect his current stock.

I suggest calling him if you are in the market for PVS-14 sooner than a  20-25 week wait.

 

When I purchased the PVS-14 in the spring he had variety of good tubes in stock and he told me gets regular shipments as a distributor.

 

Before the sale I was able to review the spec sheet and an actual image from the eyepiece.

You get to pick from what tube he has available

The only down side is he does sell the Mod3

 

Good luck

 

Max


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#16 a__l

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Posted 14 October 2021 - 11:48 PM

The only down side is he does sell the Mod3

 

 

In my opinion, this is the best option if you can attach a good PVS-14 lens to it. This is for afocal use with TV67.
Additionally.
You have the prime focus option. This option does not use additional glass and you will be able to get the best stars (with good collimation of the entire optical path).
And in addition, you have unlimited possibilities to use any other lenses.


Edited by a__l, 14 October 2021 - 11:49 PM.


#17 Speedy1985

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Posted 15 October 2021 - 10:58 AM

All I know is Ben at Kosher Surplus took good care of me.

I know he is gets his tube supply directly from L3/Harris and Ebit.

Note: His web site often does not reflect his current stock.

I suggest calling him if you are in the market for PVS-14 sooner than a  20-25 week wait.

 

When I purchased the PVS-14 in the spring he had variety of good tubes in stock and he told me gets regular shipments as a distributor.

 

Before the sale I was able to review the spec sheet and an actual image from the eyepiece.

You get to pick from what tube he has available

The only down side is he does sell the Mod3

 

Good luck

 

Max

That’s good to know that your experience was positive and I’ll definitely keep them in mind if my current vendor can’t fill the bill. I’m kind of curious as to why they haven’t been mentioned here more.

 

Anyway, I’m in no rush, so waiting to get a unit in January(they’re getting the tubes in December) is no big deal. It gives me time to gather other items like the adapters(on the way) and eyepieces. On another note, the vendor I’m currently talking with also offers a warranty that is 10 years, not 5. 


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