Items will be despatched using the selected carrier within 2 business days (sometimes sooner).
Returns are accepted within 7 days of receipt unless otherwise stated on the item.
The UCH21 is an early example of all glass construction. This triode heptode frequency changer was designed to operate on a heater chain across the mains supply, and the anode voltage is correspondingly low to take account of the low HT voltage present in universal sets. Mullard describe the valve as designed to accept ACG to the heptode.