[Heathkit] 6293 tube question

[Sandy]

The 6293 is a "pulse modulator" version of the 6146.  Some people claim it 
lasts longer in typical Class AB and C RF Amplifier service.  I have never 
used one for this purpose.  It should be a plug-in replacement for the 6146.


73,

Sandy W5TVW

----- Original Message ----- 
From: "Eric Mynes" <kc8wzb at gmail.com>
To: <heathkit at mailman.qth.net>
Sent: Saturday, October 25, 2008 8:21 AM
Subject: Re: [Heathkit] 6293 tube question


> OK, I'll asked a question that some will think is dumb.  But, is the
> 6239 a direct replacement for 6146's?  Might be nice to know if I ever
> get my 101 back.
>
> 73,
> Eric
>
> On Fri, Oct 24, 2008 at 2:04 PM, Glen Zook <gzook at yahoo.com> wrote:
>> You really cannot tell a 6293 from a "regular" 6146 series tube just by 
>> looking.  Basically, the plate assembly in the 6293 is somewhat "heavier" 
>> (i.e. "thicker").  However, the mica insulator that covers the top of the 
>> elements is opaque and therefore it cannot be seen.  Also, I suspect that 
>> you would actually have to use a micrometer to measure the difference in 
>> thickness and "eyeballing" may, or may not, show the difference.
>>
>> Glen, K9STH
>>
>> Website:  http://k9sth.com
>>
>>
>> --- On Fri, 10/24/08, Ken Kaplan <krkaplan at cox.net> wrote:
>>
>> From: Ken Kaplan <krkaplan at cox.net>
>>
>> I just got an RCA 6293 (lot 60-22) yesterday. I thought that they were 
>> visibly more robust than a 6146. I held it next to an RCA 6146 (lot 
>> 58-48) and compared what I could see of the internals and they look the 
>> same to me. The plate material is the same thickness as are all of the 
>> other visible internal pieces. Am I mistaken about visible internal 
>> differences or - drum roll - have I been scammed? The marking on the tube 
>> looks original (just like those $50's I have stacked in a shoe box - just 
>> kidding). Is there a way to visually verify its a 6293 and not a 6146? 
>> No, I'm not getting out my glass cutter. Heath content? It's for my 
>> SB-110A.
>>
>>
>>
>>
>
>
>
> -- 
> A wise man once said nothing.


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