[Hammarlund] Nuvistor Front End of Sp-600

[Carl]

The 6GM6 is an excelent 7 pin RF tube that has excellent signal handling 
capability. Ive used them in place of the 6BA6, 6BZ6 and 6DC6 in several 
radios with a very noticable improvement on the higher frequencies.

It does require socket rewiring as well as reducing plate and screen 
voltages plus a different cathode resistor.

However the improvement to a couple of Brand C and N radios made the work 
worthwhile.

Carl
KM1H



----- Original Message ----- 
From: "stanleybadams" <stanleybadams at yahoo.com>
To: <hammarlund at mailman.qth.net>
Sent: Tuesday, June 24, 2008 10:16 AM
Subject: [Hammarlund] Nuvistor Front End of Sp-600


>I think you might want to think what you are going to use the radio for.
> Casual listening to AM radio?  SSB or AM amateur (for SSB you need the
> product detector which is a far better mod in my opinion).  Do you want to
> hear TV stations on the upper bands as they go away after 2009, unless 
> they
> repeal the date?  I do not think that there really is any bang for the 
> buck,
> now if you were on Guam copying teletype from the states or ships at sea,
> that might be a diff thing.   I would suggest the 6BZ6...A very good
> remote-cutoff tube as a direct replacement for the 6BA6. No other tube 
> seems
> to work as wellwithout changing a few other parts around. Or the 6SS
> whatever the last part is 6SS6 or 5?  That was a lower noise tube for TV
> tuners.  AM band has gotten noiser with the addition of IBOC and their 
> extra
> carriers in the day time anyway.
>
> Best to you
>
> Stan Adams
> Memphis
>
>
>
>
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