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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