FWIW, there is a good illustration and explanation of
beam power tubes in all of the old RCA tube handbooks. In
fact, these books have an excellent primer on tubes and
their applications in the front. Well and clearly written.
Note: do people on this list prefer top replies or
bottom? I got a private e-mail asking me to change to top
posting so I am trying it.
--
Richard Knoppow
Los Angeles
WB6KBL
[email protected]
----- Original Message -----
From: "Garey Barrell" <[email protected]>
To: "drakelist" <[email protected]>
Sent: Thursday, August 25, 2011 2:30 PM
Subject: Re: [Drakelist] AF output tube in R4A
No. The 2-B uses the 6AQ5 and the R-4 Series all use the
6EH5.
The 6EH5 is not a Beam Power Pentode, the 6AQ5 is.
The third 'grid' in a Pentode can be either a spiral
wrapped grid like the other two, OR it can be 'plates'
that 'focuses' the electron beam more fully on the Plate.
Primary result is greater power capability as a result of
'all' Cathode current reaching the Plate.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
<www.k4oah.com>
Neil M Califano wrote:
Is the AF output tube in the R4A swappable with the same
tube in the 2-B? I Googled but it is not clear. Btw, what
is a beam pentode or tetrode? Is 6EH5 in V7 one of these?
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