[Heathkit] DX-60 Final Amplifier Tube Question

[Carl]

Mine came with a 6146W replacement in it and its still there working fine 
many years later.

There is a big difference between Class C and AB1 which I guess is where 
some rigs are fussy.
My Viking II is fine with 6146B's, plug and play.

Carl
KM1H


----- Original Message ----- 
From: "Ed - K9EW" <k9ew57 at gmail.com>
To: <heathkit at mailman.qth.net>
Sent: Wednesday, February 08, 2012 6:50 PM
Subject: Re: [Heathkit] DX-60 Final Amplifier Tube Question


> See Glen's (K9STH) explanation at
> http://k9sth.com/uploads/The_6146_Family_of_Tubes_1.pdf
>
> 73,
> ed - k9ew
>
>
>
> On Wed, Feb 8, 2012 at 5:13 PM, Ken Miller K6CTW 
> <k6ctw at earthlink.net>wrote:
>
>> All,
>>
>> I have an original DX-60 and have been looking around for another 6146 
>> (or
>> better yet a 6293 although pretty expensive it is supposed to last a LOT
>> longer than a 6146 as it was designed for pulse modulation).  All this is
>> just to make sure that the backup/repair kit for this radio will have a
>> spare or two.  Searching the usual sites noted that there are a LOT of
>> 6146W and 6146B variety tubes out there but not a lot of the older
>> 6146/6146A.
>>
>> Anyway, I seem to recall hearing that when replacing a 6146 or 6146A you
>> should NOT replace it with a 6146B.  Since my earlier post, folks have 
>> sent
>> me schematics for the later DX-60 models and there seems to be very 
>> little
>> difference between the circuits.  The only one appears to be that the RF
>> choke on the control grid is now a 1.1 MH instead of 1.0.  Thus my
>> question, why not put a 6146W in there as they are cheaper and easier to
>> find?
>>
>> Thanks in advance for any advice.
>>
>> 73 - Ken, K6CTW
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