[ARC5] Stupid Question No.5036

[Mike Everette via ARC5]

The 6BQ7 was used in a lot of Teevy Tuners as the RF stage, and I believe Hallicrafters used it in the SX-96 and SX-100 receivers if my memory's correct.  Only problem, is that it has a tendency to develop microphonics.

As for the 6BZ6, it's a good tube at VHF.  I doubt you'll be able to improve on it to any great degree.

73

Mike
WA4DLF

--------------------------------------------
On Thu, 7/24/14, D C _Mac_ Macdonald <k2gkk at hotmail.com> wrote:

 Subject: Re: [ARC5] Stupid Question No.5036
 To: "WB5WSV Wayne Eleazer" <releazer at earthlink.net>, "ARC-5 Mail List" <arc5 at mailman.qth.net>
 Date: Thursday, July 24, 2014, 6:27 PM
 
 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
      
                       
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