[Hammarlund] NOISY FRONT END TUBES

[Carl]

----- Original Message ----- 
From: "Roy Morgan" <k1lky at earthlink.net>
To: "Magoo" <magoo at isp.ca>
Cc: <hammarlund at mailman.qth.net>
Sent: Thursday, June 26, 2008 10:46 PM
Subject: Re: [Hammarlund] NOISY FRONT END TUBES


>
> On Jun 26, 2008, at 10:41 AM, Magoo wrote:
>
>> Anyone contemplating changing front end and mixer tubes in a  receiver 
>> would do well to have a look at the mods suggested for the  75A-4 in the 
>> "Collins Compendium".
>
> But beware.
>
> A number of the mods included in the ER are NOT now recommended, for  one 
> reason or another. One example is the sheet beam tube mixer mod.   The 
> tube (is it the 7360?  I can't remember the number), is quite  expensive 
> now, and other mods work better.


But it was the big kid on the block in 1964. There was also a 12AT7 mixer 
mod back then followed by the 6DJ8/6922 and others. From what Ive learned 
using the 6ES8 in recent tests and mods in other radios Im very impressed. 
BUT the 7360 has bodacious signal handling capability. Luckily I have NOS 
spares which should outlast me.

Thanks for the other info Roy.

Carl
KM1H