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New (November 12, 2021) The Keyall HV + kit

update: May 6, 2022: check your transmitter schematic to see if one side of the filament is grounded, then select the correct set of documentation below

See this page to compare the various Keyall kits

[Keyall HV + parts picture - click for larger view ] The Keyall HV + kit allows the owner of a keyer with a low voltage positive (NPN or n-channel MOSFET) keying transistor to drive the vacuum tube transmitters and transceivers of yesteryear. This unit will key negative voltage rigs (grid block keying) or positive voltage rigs (cathode keyed tube transmitters. The output transistors and capacitor are rated at 1000 V and 3.1 A (3100 mA).

Suggested by Wes, W3KW, the Keyall HV + kit is an update of the original Keyall HV kit that is mounted inside a tube transmitter and is powered from the 6.3 VAC filament winding.

  • design is a MOSFET based solid state relay, SPST-NO single pole, single throw, normally open
  • the kit adds a 3.3 volt regulated power supply powered by the 6.3VAC filament winding to the regular Keyall HV kit
  • high voltage output is optically isolated from the low voltage input
  • kit includes a circuit board and most board mounted components
  • board size is 2 x 2 inches
  • Price (no printed documentation) is $18 + shipping/handling
  • add another $2.00 for a 6 pin socket for the PVI
  • please pick the correct set of documentation below, grounded filament transformer (xfmr) or floating filament xfmr

    • Printed manuals available for an additional charge or save money by downloading (Right click/save target as) and printing the

    grounded filament manual , grounded filament schematic and grounded filament parts placement diagram.

    floating filament manual , floating filament schematic and floating filament parts placement diagram.

    Print out a Kit order form to figure your order manually
    OR try our: javascript order form to let your browser do the math

    Rob, KT4RE, sent some pictures of his Keyall HV+ install inside an SB-200 amplifier: board installation , added 14 VCT transformer with center tap grounded and board closeup. Thanks Rob !
    Rob also supplied these notes on his SB-200 installation.

    update: June 25, 2025 - If you are not adding a transformer as KT4RE did please note that the SB-200 has a 6.3 VAC filament transformer with a grounded center tap. In addition to using the grounded set of instructions, Ken, W8EK, has found that the on board LED should be replaced with a short or the Keyall HV+ will NOT function correctly.



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