SELL: Absolutely mint Drake L4B linear amplifier (serial # 2631)
dedicated to 6 meters 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. Obviously, can be pushed a bit more but not recommended. All
power supply and control circuitry is stock Drake except for the RF deck
changes noted below:
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 antenna 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 achieving an extremely
smooth "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). The only
changes 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.
c. Meter selection switch continues to monitor all functions. No circuit
changes.
The Drake RF deck chassis is absolutely perfect in all aspects. 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. The PS cabinet has some barely visible blemishes on the
top but there are no bangs or dents. The original 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
changes. Troubleshooting is easy to follow with the Drake schematic
because of the minimal circuit alterations. $1050. Prefer pickup in the
New York City or Scranton Pennsylvania area or will be in Dayton. 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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