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RedPlate RedLine Operations Guide
Warning – No user serviceable parts inside so unless you know what you're
doing please refer to a qualified service person only.
Luckily for you – this amp can be biased without going inside.
1. When new EL-34 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 red lead is the DC voltage terminal of the meter.
4. Place the Amplifier in operate mode with the Master Volumes set to zero.
5. 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, one of the chassis mount screw
heads or anywhere that gets the meter at chassis ground.
6. Use a small flat blade screwdriver to adjust the bias pot for the bias number as stated on
the rear panel ( ± 5 MV). The reading is the sum of the idle current for all EL-34 tubes.
7. Recheck the reading after 10 minutes of operation, and again after a week or two of
operation.
At RedPlateAmps we pride ourselves making products that are built to last. The workmanship in
your RedPlate amplifier is warranted to be problem free for the lifetime of the original owner.
The actual electrical components in your amplifier are warranted for a period of 3 years.
Exclusions are vacuum tubes, reverb tanks, cables, speakers and cosmetics which are warranted
for 30 days. Improper handling or product misuse or product abuse or unauthorized repair work
or unauthorized modifications may nullify your warranty. Eligibility for coverage and covered
items are at the sole discretion of RedPlateAmps.
RedPlateAmps
www.RedPlateAmps.com
email:
info@RedPlateAmps.com
Thanks again for joining the RedPlate Family – Henry
BIAS PROCEDURE
RedPlateAmps Warranty
4
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