[time-nuts] HP 117/10509a

[Ron Ward]

Hi:
Yes, please make a .PDF File available!

Thanks,
Ron

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of bill
Sent: Thursday, July 05, 2012 3:57 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP 117/10509a

On 7/5/2012 9:49 AM, Randy D. Hunt wrote:
> On 7/4/2012 11:09 PM, Charles P. Steinmetz wrote:
>> Don wrote:
>>
>>> the fet breakdown voltage has of course got to be high enough.
>>
>> If the nuvistor is used as a common-cathode or common-grid amplifier,

>> you can cascode the fet with a bipolar to extend its drain voltage 
>> range.  You will need to come up with an appropriate bias source for 
>> the bipolar.  Generally, you would want at least 10-15 volts across 
>> the FET channel.
>>
>> Choose an appropriate JFET (transconductance, drain current, and 
>> gate-drain voltage similar to the nuvistor at the nuvistor's 
>> operating point).  You can add degeneration (source resistance) to 
>> lower the FET's transconductance if it is higher than the nuvistor's.
>>
>> Best regards,
>>
>> Charles
>>
>>
>>
>>
>>
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> I have a PDF document that covers this for Fetrons. This is from 
> Teledyne.  It shows some of the more common tube replacements with the

> circuit and actual device number. Let me know if you would like a copy

> and I will sent it to you.  Or, maybe a better option would be to 
> upload it to something like Didiers site. . .
>
> Randy
>
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Yes do upload it. I have some Fetrons and want to know what they 
replace. And in my other life, I ordered some custom Fetrons
to replace some WE tubes that was used in WE K carrier. If you don't 
upload it, send a copy.

Bill K7NOM

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