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Re: [Amps] YU-158 still being made?

To: 'AMPS' <>
Subject: Re: [Amps] YU-158 still being made?
From: "Dr. David Kirkby" <>
Date: Wed, 13 Jul 2011 21:03:05 +0100
List-post: <">>
On 07/13/11 07:39 PM, ED MCKIE wrote:
>   I built a twenty meter monobander in1997 using a new YU-158 I got from a
> friend who had a friend that worked for GE Medical Systems. I found when
> trying to get info from Eimac that it was a proprietary tube made for ETO.
> About all I could get out of CPI / Eimac was that is was a more rugged 8877
> and ran lower grid current for a given output.
> Well, there is a new YU-158 for sale on Ebay with a date code 1039. My
> question is this: if it was a proprietary tube made for ETO, do they still
> make them or could it be a counterfit. The 1 on the datecode is taller than
> the rest of the numbers in the date code.
>   I read something a few days ago about people putting CPI / Eimac silkscreen
> on import tubes.
> TNX, Ed

Assuming you are talking about this auction

it's possible the "1" looks bigger due distortion caused by the perspective 
and/or the use of a lens not suited to close up work. The anode appears to be 
much deeper at the front than at the back.

Many cameras have a "macro mode" which can do close-ups, but the lenses do a 
pretty poor job, as they are optimised for focus at much longer distances.

I've got a 105 mm macro lens for my Nikon D3 and the lens cost about 4 x that 
a typical 12 Mpixel camera with inbuilt lens which has a macro mode.

Someone recently made me some clips to hold an Eimac SK-810B base in place. He 
sent me a photo of the completed clips.

Note how the clip at the top appears to be quite a different shape to the other 
two. The piece of metal on the side which is not drilled looks to be much 
than the corresponding parts on the other two clips. This is just a problem 
the image. I'm told they are the same and whilst I've not put a micrometer on 
them, they look approximately the same when viewed with the eye.

If someone was going to go to the bother of badging conterfeit tubes with an 
Eimac label, I'm sure they would have the ability to print the numbers 
As such, I suspect that's an optical illusion.

As to whether its a fake or not is another matter. It would seem suspicious.

A friend of mine bought a handbag for about $1000 through eBay. It was a fake 
she reported this to eBay and Paypal. Then Paypal wanted an expert to determine 
if it was a fake or not, so my friend had to appoint one. The expert found 
endless signs to indicate it was a fake and submitted a report.

Paypal made life very difficult for her. She had to fax documents - despite one 
can sign up and move money with Paypal with a computer, for the document it has 
to be faxed.

The end result was Paypal agreed it was a fake, so refunded her the money.

Since it was a fake, Paypal insisted that the handbag was not returned to the 
seller, but must be destroyed. So she got her money back and kept the bag! 
Needless to say she did not destroy it! So the seller lost not only his bag, 
his money too. (I'm told its quite a nice bag, though it is indeed a fake).

A: Because it messes up the order in which people normally read text.
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