[Amps] 813 Amplifier Article

[jerryjtb at comcast.net]

Should anyone be interested I have a new pair of Eimac 4E27 tubes. They were
stored for at least 25 years.

Jerry W0ZD/3

-----Original Message-----
From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
Behalf Of Carl
Sent: Thursday, March 31, 2011 10:34 AM
To: ka4inm at tampabay.rr.com; amps
Subject: Re: [Amps] 813 Amplifier Article


----- Original Message ----- 
From: "Ron Youvan" <ka4inm at tampabay.rr.com>
To: "amps" <amps at contesting.com>
Sent: Thursday, March 31, 2011 8:57 AM
Subject: Re: [Amps] 813 Amplifier Article


> Fuqua, Bill L wrote:
>
>> I have thought of replacing the 813's with 4E27A's. Has anyone used 
>> 4E27A's in grounded grid.
>> They are pentodes with 125 watts plate dissipation and wire the filaments

>> in series since they are 5V.
>> They should have a nice plate glow to them and go in the same socket.
>
>    http://www.tubecollector.org/4e27.htm
>
> says the 4E27 has a 75 Watts plate dissipation.
>   ???  I believe the 4E27 is more rare than 813s.
> -- 
>    Ron  KA4INM - Endless Loop: n.        see Loop, Endless.


I notice 4E27A's being ignored on Fleabay and at hamfests. My only 
experience with them was a couple of 6M AM rigs I built to get some activity

on the band. They sure did glow nice.

The H&K 257B is a 4E27 clone.

If you dont want bands above 20M a couple of 803's can really make some 
power and will take the same socket as the various Eimac 4- and 5- triodes 
and tetrodes.

The 814/VT-154 is a scaled down 813 and generally ignored but 3-4 will be 
heard.

Carl
KM1H 

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