Drake Amateur Radio Club - W8CYE
R. L. Drake Virtual Museum - Sindre Torp
BAMA - Drake Manual and Schematic Archive
Cin-Tran, Inc. - A Company that manufactured transformers for Drake (purchased by Standex International in 2002)
EB5AGV / EC5AAU Drake C Line Repair and Mods page
- Frontier Capacitor - Rebuilding of Can Type Capacitors
(877) 372-2341; FAX (701) 378-2551
International Radio - Crystal Filters for R-4C and TR-7/R7
Drake Service CDs - By Garey Barrell, K4OAH
K5DKZ - Convert your T-4 to 6146 with mod kit and more!
NU0C - TR-7 Extender Boards
Radiophile.com - W1JA's Vintage Drake Station
Sherwood Engineering - Modification Kits and Installations for R-4C
T & T Drake Repair - Larry Taft, K2LT and Henry Turner, KC5FLJ
WB4HFN - Lots of information on Drake gear
2B Radio Parts - Don Garrett - Replacement Parts for Drake Radio Equipment
Crystal Suppliers Recommended by Bill Frost
B D Crystals
1438 Cox Avenue
Erlanger, Ky. 41018
Velco Electric, Inc.
611 Wangum Road
Fishers, NY 14453
Other Drake Information
Drake User's Net - Tuesday nights, 2000 EST 3865 kHz; technical net on Sunday 2000 EST 7238 kHz
Drake Cabinet Paint
73, Bruce WC1E
6JB6 Matching Procedure
I received numerous requests for Bill Frost's description of a procedure to match the 6JB6 finals in 4-line equipment. Rather than send to many individuals, I think the interest is high enough to share the procedure with everyone. It is brief. By the way, I am told by others that Sylvania 6JB6's don't require matching because of their quality.
73, Wayne, KG5BI
Thanks for the e-mail. The 6JB6 tubes were matched on cathode
current. A fixture was designed and built by the Engineering Dept. that
kept the operating voltages constant while measuring the cathode
current. A similiar test can be preformed by using the T-4X or TR-4 as
the test fixture.
1. Turn unit off and disconnect power supply. Place the unit upside
down and remove the bottom cover. Re-connect power supply.
2. Key the transmitter, with the transmitter gain control at minimum (the
transmitter should only be drawing idle current).
3. Measure the voltage at pin 3 of each final tube. The voltage should be
within .1 or .2 volts to be "matched". Substitute tubes and re-measure
until all tubes are "matched."
R.L. Drake Service Manager