Plexi 45 Joins Retro-King's Hand-Wired Amp Line

October 20, 2005

The output tranny is built for Retro-King by heyboer with the 6.6k primary plate load which is optimal for the kt-66 power tubes. As in the originals, the filtering in the first cap is a double 32mf cap and the second is a double 16mf cap. This amp uses the early "plexi" tone control values along with the standard preamp values. You can also order this amp with the optional negative feedback control adjustable from the stock 27k to 47k. This will give an increase in gain. The "Plexi 45" is also available in a 2x12 combo.

The "Plexi 45" features:

  • 2 channel 4 inputs (high & low)
  • High treble & normal channels
  • (2)Volume, Treble, Mid, Bass and presence
  • 2 Matched KT66 power tubes (valve art)
  • 3 JJ 12AX7 preamp tubes
  • 1 GZ34 rectifier tube
  • Heyboer transformers (original radiospares specs) (120/240 volt primary)
  • Output Tranny has correct 6.6 k primary
  • 4, 8 or 16 ohm selector
  • Two speaker outputs
  • Optional negative feedback control (27 to 47 k)
  • Plexi panels
  • Original JTM 45 Plexi specs
  • Correct filtering
  • Mallory caps allen bradley carbon comp resistors
  • Aluminum chassis
  • Hand wired point to point (Teflon wire)
  • Baltic birch cabinet (black Levant Tolex)
For more information, visit their web site at

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