[Heath] Solid State substitutes for tubes - More info

[jeff.atg at onemain.com]

The solid state replacements are called Fetron and were a product of Teledyne... difficult to find. I have been running a pair in my IM 5228 VTVM and have had no difficulties. I have attached a Teledyne spec sheet from my library.  Jeff L.

-----Original Message-----
>From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
>Sent: Feb 13, 2015 12:07 PM
>To: MProc30634 at aol.com
>Cc: Heath at puck.nether.net
>Subject: Re: [Heath] Solid State substitutes for tubes - More info
>
>On 12 Feb 2015 at 20:42, MProc30634 at aol.com wrote:
>
>> Be aware they have problems and maybe a short life in the meters.
>> Mine drifted alot.
>
>These are some of the reasons I removed mine and installed real tubes in 
>their places. The meter now works reliably and accurately. I probably 
>"misplaced" them for a good, but possibly subconcious, reason. I was not 
>pleased with their operation.
>
>I don't like them
>
>However, recently, I had a very good reason to obtain a solid-state version of 
>a 1L6 for my AN/GRC-109's receiver, the R-1004. I ran into a fellow on eBay 
>who was making solid-state replacements for tubes which show up in the 
>Zenith Transoceanic and which are very hard to find.
>
>He makes these using FETs of some sort, and then seals them inside a tube 
>envelope. It is not necessary to make any changes to the receiver: just plug 
>them in and use them.
>
>I tried one for my R-1004 and was amazed at its capability! It is far more 
>stable and far quieter than the 1L6 I had in there. Furthermore, using one, 
>the receiver no longer is pulled off-frequency by a strong signal...including 
>the local transmitter when operating QSK.
>
>It worked so well, I contacted the fellow again, and asked him to make me a 
>SS equivalent of the 1T4s in my receiver.
>
>He responded very quickly at what I considered to be minimal cost. When 
>plugged in, the result was far better than a new tube.
>
>Quieter, less noise, more stable, less interference from the transmitter, etc.
>
>I am not only amazed, but also very pleased.
>
>The fellow who is making them is an EE and apparently is very adept at 
>matching the characteristice of tubes with SS devices.
>
>You can find him by searching on eBay for 1L6. He also has a website. I'll try 
>to find the info and will post it here.
>
>Ken W7EKB
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