My first Homebrew HF Transmitter

It's a 15W CW/10W AM transmitter for the 40m / 20m bands, based on G3OGR -  OM F.G. Rayer's  
article 'QRP Transmitter for the LF Bands' published in the August 1971 issue of 'Practical Wireless' 

15W CW/10W AM Transmitter for 7/14 MHz
The transmitter stages are as follows:

ECC81 - VFO on 3.5 MHz
EF89 - Buffer
EF89 - Multiplier to 7 MHz
EF89 - Multiplier to 14 Mhz
EL86 - Final with Pi tank

15W CW / 10W AM Transmitter for 7/14 MHz - top inside

It has a companion power supply cum modulator.

The modulator stages are as follows:

ECC83 - Speeech Amplifier
EL84 - Modulator

Here are the design manuscripts:

Transmitter Schematic
Power Supply cum Modulator
Power Supply Schematic
Modulator Schematic
Transmitter - Instructions
Using this transmitter, a number of CW DX stations (including a 'W' on 40m) were worked in the late 1970s. AM DX contacts were also made with 4S7 and YB0 stations.

Only simple dipole antennas were used.

Related post: A Homebrew 100W (DC Input) Class 'C' Amplifier