[TenTec] Ten-Tec 811A or 572B amplifiers?

[CATFISHTWO@aol.com]

the 572 is pretty much a drop in replacement for a 811, BUT you can buy 3  
brand new 811's at ameritron, for about $50 or buy 1 572 for $60.  
 
most rigs can not use the extra "room " available in the 573's vs. 811 so  
most of the time its a waste of $$ . for example the 811 series amp by ameritron 
 uses  four 400 volt caps in the power supply for a 1600 volt max, and  
cannot get  any higher, so the 527 is basically a big waste of $ in most  amps. 
 
 the reverse is not true, I.E. do not use an 811 in place of a 572 as  the 
2200 volts on the plate  lets out all the factory smoke in an  811..  YMMV
 
tom N6AJR
 
 
In a message dated 12/10/2005 4:27:15 P.M. Pacific Standard Time,  
RMcGraw at Blomand.Net writes:

As to  using 572B's in the Centaur 411, there is no advantage unless the 
power  supply is adequately beefed up to take advantage of the increased  
dissipation and thus higher output rating.

73
Bob,  K4TAX


----- Original Message ----- 
From: "Ken Brown"  <ken.d.brown at verizon.net>
To: <tentec at contesting.com>
Sent:  Saturday, December 10, 2005 5:34 PM
Subject: [TenTec] Ten-Tec 811A or 572B  amplifiers?


> Looking at the Unofficial and official Ten-Tec web  sites, I see only one
> amplifier by Ten-Tec that uses 811A tubes. This  is the Centaur 411 which
> uses three 811As. Has Ten-Tec never made an  amplifer that used two 811As
> or four 811As? How about 572Bs? Has  Ten-Tec ever made an amplifier that
> used 572Bs? Can 572Bs be used in  the Centaur 411?
>
> DE N6KB