[Amps] Al 572

[R.Measures]

Tnx, Steven --  This is  the same kind of neutralizing circuit that 
both Gonset and Heath tried in their 4, 811A amplifiers and both 
promptly abandoned because it increased VHF squirreliness.
-  The gotcha is that there is no way to neutralize an HF amplifier on 
the parasitic VHF-resonance in the anode circuit.  The only game in 
town is to artificially reduce the VHF gain of the tube by decreasing 
the VHF-Q of the suppressor.

On Dec 22, 2004, at 7:19 AM, Steven Grant, W4IIV wrote:

> it does have a neutralization circuit
>  
> steven
>
> "R.Measures" <r at somis.org> wrote:
>
> On Dec 21, 2004, at 9:02 PM, larry williamson wrote:
>
> > Sorry I did not say the kind of amp.... It is a AL 572... Only about 
> 8
> > months old. I just tonight installed the new 51 ohm resistor and one
>  > new tube form ameritron. Only tried about a 10 minute chat on 160 
> and
>  > it seemed to be ok. I will run it more over the next few days and 
> see
>  > what happens. Both times the amp was on standby for about 1 hour and
>  > it blew when I keyed up within the first 10 seconds. The bad thing 
> ---
> > I don't have a lot of knowledge of electronics, just the basics.
>
> Larry -- Does the AL-572 have a neutralization circuit? Tnx
>
  Richard L. Measures, AG6K, 805.386.3734.  www.somis.org