THE MULLARD WORLD SERIES VALVES (vi) - VIDEO OUTPUT PENTODE PL83

Although in 1951, we still had miniscule telly screens and 405 lines, Mullard was looking to the future as they knew the time would come when bigger screens and 'high definition' TV with more lines would be introduced.  But with increases of this type, the pre-exisiting video output valves were decidedly weedy and underrated.

To meet these future requirements, in 1951, the Mullard boffins designed the PL83 which essentially is an EF80 on steroids, whereas the EF980 has sand kicked in it's face because of a maximum anode disippation of 2.5W, the PL82 didn't as it boasted 9W, similarly, size is everything with a comparison of the EF80's mutual conductance of 7.4 mA/V against the big bad boy's 10.5 mA/V.  The steroid analogy actually is quite a good one as the PL83 had a very robust electrode cage to prevent microphony.