[Central-Electronics] CE 20-A

[George Maier]

Hi Joe:

 

Nice to see you on this reflector for a change.  I'm glad to hear that
you've taken the plunge into a 20A & Lakeshore; a great combination.  

 

All of the answers that you've already received about a 600L are right on;
it's the best match there is for a 20A.  K5MO's suggestion of a WRL  LA-1 is
also good; that will get you to the 100W (output) level at least.  Also, be
sure to keep you eye's open for any of the P&H amplifiers; they were
designed to work with the 20A.  

 

The circuit for the original P&H linear is in the June 1955 issue of QST;
not too hard to duplicate, except for having to modify the 1625 base.  

 

The easiest home brew route, however, would be a grid driven 4CX250B.  Only
needs flea power to drive, and you should get 300 W PEP without too much
strain.

 

73 & good luck Joe..keep us posted!

 

George - W1LSB (ex K1GXT) 

 

 

 

  _____  

From: central-electronics-bounces at mailman.qth.net
[mailto:central-electronics-bounces at mailman.qth.net] On Behalf Of jsloss
Sent: Wednesday, October 29, 2008 11:54 PM
To: central-electronics at mailman.qth.net
Subject: [Central-Electronics] CE 20-A

 

Have been offered a factory wired 20A, S/N 746X, that has been stored since
1973.  Am comfortable with slow power application, filter replacements etc
but am wondering if there have been any S/B's or major mods for that serial
number range.  Any info on increasing power out a bit might be interesting
although a basic GG one or two tube linear might be a better way to go.
Will  be using it with a Lakeshore SSB VFO

 

Thanks,

 

Joe k7mks

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