[ARC5] Stupid Question No.5036

[D C _Mac_ Macdonald]

Hi, Wayne. 
 
You'll likely get a good response to your question if you ask it on either the National or Boatanchors mail list.  
 
KM1H is the former head of National's service department and has written on several occasions regarding "hottening up" old tube receivers.  I don't remember off-hand his recommendations, but use of a remote cut-off tube for the RF amp is definitely a major concern IIRC. 
 
* * * * * * * * * * * 
* 73 - Mac, K2GKK/5 * 
* (Since 30 Nov 53) * 
* k2gkk hotmail com * 
* Oklahoma City, OK * 
* USAF & FAA (Ret.) * 
* * * * * * * * * * * 
 

 
> From: releazer at earthlink.net
> To: arc5 at mailman.qth.net
> Date: Thu, 24 Jul 2014 14:00:43 -0400
> Subject: [ARC5] Stupid Question No.5036
> 
> I have a stupid question.
> 
> Where in the usual tube data is the frequency response for the tube?
> 
> I am considering replacing the 6BZ6 RF amp tube on a National NC-270 with a tube that will give better performance on 6 Meters.  The 6GM6/6EW6 looks like a possibility but how do I know that the performance on 6 Meters will be better?  It is a tube used in the IF's of TV sets, and that sounds good, but I see no data that tells what the frequency capabilities of tubes are.  The old ARRL handbook had the max usable frequency for triode transmitting tubes but I do not see similar data for other tubes anywhere.
> 
> Thanks,
> 
> Wayne
> WB5WSV