Re: [Amps] Collins 30L-1 / 572's B

["K2DP" <k2dp@charter.net>]

OM's,

For what it's worth, I 'm running a 1965 vintage 30L-1 with Taylor (RF 
Parts) 572B's in it and have seen no indication of instability on 28 mhz or 
any other band. There is of course NO difference in power output between the 
811A's and the 572B's. However, I made the change because at the time that I 
was purchasing the tubes for replacement purposes, there did not appear to 
be a clear winner in "quality" of the 811A's, having seen Svetlana drop 
their line of ceramic based 811A's. So, I paid more, but have some very 
SOLID tubes in my 30L-1 which is working just fine !

73,
Dave, K2DP, St. Louis
----- Original Message ----- 
From: "Vic Rosenthal" <vic@rakefet.com>
To: "Javier Remoto" <jlopez@plasticosomega.com>
Cc: <amps@contesting.com>
Sent: Sunday, September 19, 2004 9:52 AM
Subject: Re: [Amps] Collins 30L-1 / 572's B


> Javier Remoto wrote:
> > Hi,
> > A friend of mine suggested me to change the 811's A at my 30L-1 for 572's 
> > B, does it make sense?
>
> Not really, because you would not get any more power unless you increase 
> the plate voltage, which would cause other complications.  Also, the 
> interelectrode capacitances and lead inductances are different, which 
> might cause instability.
>
> --
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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