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RedPlate RPHD100 Operations Guide
Warning – No user serviceable parts inside so unless you know what you're doing please refer to a qualified
service person only.
1. When new output tubes are installed it is important to re-bias the amp for optimal performance.
2. ALWAYS HAVE A SPEAKER CONNECTED.
3. Use a digital volt meter set to DC volts at lowest scale (MV). Makes sure the black lead is the common terminal of the meter and the
read lead is the DC voltage terminal of the meter.
4. Place the Amplifier in operate mode with the Master Volume and Reverb controls set to zero.
5. Set the 100 WATT/ 50 WATT switch to the 100 WATT position.
6. Place the red meter lead in the test point hole (red tip jack) And touch (or clip) the black meter lead on one of the metal output tube
retainer clips.
7. Use a small flat blade screwdriver to adjust the bias pot for a reading to match the recommended value printed on the rear panel ±
5 MV. The reading is the sum of the idle current for all output tubes.
8. Recheck the reading after 10 minutes of operation, and again after a week or two of operation.
The RPHD100 has one internal trim for the Phase Inverter tube balance – Useful for working with unmatched 12AX7 tubes in the phase
inverter position. Refer to qualified personnel for proper setting.
NOTE: Observe the Bias settings and Fuse ratings written on the rear panel(s) for operating and biasing the RPHD100.
BIAS PROCEDURE
INTERNAL TRIM POTS
7
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