Pride Amp Series, Service Manual

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Copyright © 2004 CBTricks.com
Pride DX-300 CHAPTER 1
1.0 INTRODUCTION:
In putting together this manual I started with the Pride DX300 factory manual added information that was missing
and in error, put together new updated schematics and PCB layouts.
The Pride DX-300 is a high frequency linear amplifier covering the Amateur bands from 3.5 to 30 MHz.
Pride Electronics in San Diego CA was a manufacturer of RF amplifiers and VFO's, as well as
frequency counters. The products that Pride built where assembled by handicap people hence the slogan printed
on the back of the amplifier
“Manufactured with Pride by the Handicap” . I think that most of the DX300’s
where built between 1977 and 1978. Some people say that Pride was in the business of selling CB amplifiers
under the guise of amateur radio amps.
The Pride DX300 has no screen regulation, no feedback, and no screen or grid metering it was designed to
provide a medium power amplifier with high power gain at LOW COST.
It does have a receiver preamplifier, and automatic RF actuated switching. The amp has no mistuning protection
but with care anyone should have not problems with tuning it using the TUNE mode.
1.1 SPECIFICATIONS:
Power Ratings:
Mode Drive Power
SSB 15 watts peak. 1000 watts PEP input 650 watts nominal peak output any band.
CW 10-12 watts. 750 watts input, 50% duty cycle, 500 watts nominal output any band
AM 4-6 watts. 500 watts input, 5-minute cycle, 300 watts nominal output any band.
Frequency Coverage:
3.5 to 4.0 MHz
7.0 to 7.3 MHz
14.0 to 14.35 MHz
21.0 to 21.45 MHz
28.0 to 29.70 MHz
Device Complement:
1 4CX250B ceramic/metal tetrode
1 2N2905 receiver preamp transistor
1 2N2905 RF switching transistor
24 1N4007 rectifier diodes
5 1N4001 rectifier diodes
3 1N914 small signal diodes
Metering Functions:
Meter reads RF power output.
Amplifier tube screen current is monitored by an LED indicator.
Receive amplifier and power amplifier status are also monitored by LED indicators.
Front Panel Functions:
Power On/Off switch
Receive preamp on/off switch
SSB delay on/off switch
Tune/Standby/Operate switch
Plate tuning control
Band selector switch
Plate Loading control
Rear panel Functions:
Bias adjustment pot, Metering Jack and Input / Output RF connections.
AC Power Requirements:
120VAC 60 Hz, 500watts average 1000watts absolute peak.
Dimensions:
12" wide x 9" high x 12" deep.
Weight:
29lbs.