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[AMPS] Re: [Drake] SELL: Drake L4B Amplifier retrofitted for 6m

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Subject: [AMPS] Re: [Drake] SELL: Drake L4B Amplifier retrofitted for 6m
From: w2cqm@juno.com (w2cqm@juno.com)
Date: Sat, 10 Feb 2001 07:47:37 -0500


 SELL: Absolutely mint  conditioned (exterior)  Drake L4B linear
amplifier (serial #  2631) retrofitted and dedicated  to 6 meter
operation  running a pair of Eimac 3-500's. Easily develops 1000++  watts
OUTPUT  with 80W of drive (200ma of grid current) in the SSB 
 condition.  All power  supply and control circuitry  is stock Drake
except for the RF deck
 changes noted below and depicted on the digitals:

 a. parasitic chokes rewound 
 b. HV plate choke rewound 
 c. Dedicated  6 meter silvered, broad banded coil allows for 1 mHz  DX
 chasing excursions without retuning.
 d. wide spaced, low capacitance plate tune air variable allows for
 smooth  plate resonance tuning.
 e. moderate capacitance antenna tune air variable provides for 
 smooth antenna matching 
 f. "T" match exciter input control provides for  extremely  smooth
tuning for  "zero" SWR and maximum exciter drive. This is especially 
important today because  of the often temperamental nature of the  solid 
state rigs that shut themselves down.  This control replaces the OEM
 bandswitch/coil assembly on the deck; however, careful attention was 
paid  to the retrofit  so that the amplifier does not appear to be 
modified in  any way.  

 The front panel is absolutely stock Drake (in appearance).  Meter
selection switch continues to monitor the full range of  functions. No
internal  circuit  changes were made to  the power supply. The only
alterations to the control panel are:

 a. Standby/operate switch functions  normally but AGC removed.  Rotates 
rather than push/pull.
 b. "T" match tuned exciter  input control replaces the Drake
bandswitch/coil assembly. 
 
 
 The Drake RF deck chassis is absolutely perfect in all aspects. Paint is
original Drake.
 There are  no scratches, dings, or abrasions. The chassis interior is
clean and
 bright with no smoke residue. There has been no "butchering" of the
 wiring.  The L4PS  matching power supply remains OEM Drake with no
 circuit changes. Only on careful examination the  PS cabinet exhibits 
some barely visible blemishes on  the  top but there are no bangs or
dents. The Drake quality  control tag 
 is  still attached to the power cord. The package includes the original 
 Drake  manual. A schematic is provided outlining the basic mechanical 
changes.
 Troubleshooting is easy  to accomplish using the Drake schematic 
 because  of the minimal circuit alterations. $1050. Prefer pickup in New
York 
 City  or Scranton Pennsylvania area. Will be at Dayton ( Timonium??).
Will consider shipping (reluctantly) at purchaser's expense provided a
professional packer (mailboxes, etc.) does the final double boxing to
ensure safe delivery.  Ron W2CQM New York  City
 
 
 http://homestead.juno.com/W2CQM/files/DRake6mpanel.jpg
 http://homestead.juno.com/W2CQM/files/Drake6mdeck.jpg
 
 
 Epilogue: See QRZ.COM for the listing of the  most recent articles
 written  for QST and 73 Magazine authored by W2CQM.
 http://www.qrz.com/callsign.html?callsign=w2cqm

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