Bottom view. NJ7P Database
| <<<OzValveAmps |
The 6DQ6A is a top-cap beam pentode designed for service as a line output valve in black and white television horizontal stages. (see also 6CM5)
The “beam” bit indicates that it is a pentode, but with beam-forming plates instead of a conventional spiral grid.
These were designed for use as horzontal output valves for service in larger screen 21 and 23-inch black and white television sets. This explains the odd very high peak voltage rating on the anode, several kilovolts, of little interest in audio applications.
Electronics Australia remarked that they have a “similar” plate characteristic to the 6CA7/EL34 for audio service but hard data is scarce.
From their switching background have a higher gain than most with respect to screen grid voltage which must be firm to achieve full output power in audio service.
Unlike the 6CA7/EL34, the 6DQ6A tends to fail gracefully with its emission dropping gradually over time.
Please note a critical difference between the 6DQ6, 6DQ6-A and the 6DQ6-B versions; the latter had higher anode power rating than the former, 15 watts upgraded to 18 watts. Note that as designed even the 40 watt Playmaster 116 requires the 6DQ6-B version.
Beam Pentode Plate Voltage ................................. 770 Volts Grid No. 2 Voltage ............................ 200 Volts Plate Dissipation ............................. 18 Watts Grid No. 2 Dissipation ........................ 3.5 Watts
Typical application in class AB1 push-pull.
See also Goldentone and Playmaster 116/7.
<<<OzValveAmps
http://www.ozvalveamps.elands.com/6dq6generic.htm | Last update: 23:20 13/01/06 |
