To reduce the "Average Bias Reading" from "37mV" to "35mV," please adjust the right
channel Bias pot (ie. "V4," and "V6" output tubes) so that together, both tubes average
"35mV" (ie. set "V6" to read "36mV" and set "V4" to read "34mV").
9. Repeat thee procedures for your left channel (ie. "V5" and "V3" tubes).
10. Roger A. Modjeski recommends setting the Bias of your RM200MkI/MkII amplifier
closer to "Recommended” mV values shown in the table above as this will result in a
slower tube dissipation rate (ie. your output tubes will have longer life)...Our experience
shows that the tube life is 5000-10,000 hours at this bias setting…However, your
RM200MkI/MkII amplifier will produce lower distortion with a Bias setting closer to
"Maximum” mV values shown in the table above.
“CAPACITOR FORMING CIRCUIT” FOR RM200MKII
Your RM200MkII includes the industry’s first “capacitor forming circuit” for a tube amplifier.
This unique circuit allows charging the capacitors in your RM200MkII without energizing
your Rm200MkII’s tubes to maximize the musical performance of your RM200MkII without
prematurely dissipating your tubes to extend their tube life.
EMPLOYING RM200MkII’s “CAPACITOR FORMING CIRCUIT”
Your RM200MkII employs two 70-Amp rated “high in-rush” power switches for long switch
life. One power switch is marked “Master/Forming,” and the other is marked “Play.”
Please press the “Master/Forming” power switch to the “on” position first. The
“Master/Forming” switch in the “on” position charges the capacitors in your RM200MkII at a
higher than normal operating voltage to assure your RM200MkII is always “ready-to-play”
at maximum musical performance.
When you are ready to play your RM200MkII, then please press the “Play” power switch to
the “on” position. The “Play” switch in the “on” position reduces the voltage in your
RM200MkII to the normal operating voltage, and energizes the tubes in your RM200MkII.
Your RM200MkII is ready for “active listening” after a brief tube warm–up period
(approximately 15-minutes).
ADJUSTMENTS, FUSES, TUBE CONSIDERATIONS AND LIFE
CHECKING BIAS
We have designed your RM200MkI/MkII to make tube biasing simple using a voltmeter.
The test points are accessible from the top of your RM200MkI/MkII so you don’t have to
remove anything. You may check the bias as often as you like, and we recommend you
check your RM200MkI/MkII’s tube bias at least twice-a-year. We do not
recommend leaving the meter connected permanently as there is a small risk of damaging
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