Mesa/Boogie pmn owner manual REAR PANEL: Continued, BIAS SELECT Continued

EXTERNAL SWITCHING:

REAR PANEL: (Continued)

BIAS SELECT: (Continued) chording or soloing, to an all out high gain crunch or lead sound. Players that use mostly these

types of sounds may prefer the EL34 clip to the 6L6’s that come standard in the new RECT-O 50 amplifi ers. If you need a variety of sounds and rely on a clean chording sound much of the time, you will likely prefer the stock compliment of 6L6’s that both of these two versions are fi tted with. We feel the 6L6 is a more balanced sounding tube that produces plenty of harmonic lushness, while at the same time delivering the rich lows that are crucial to both a warm clean sound and huge, tight high gain crunch sound.

We recommend the 6L6 for reliability: In our many tests and continued use of the currently available EL34 type power tubes on the market today, we regret to say that they do not appear to be as rugged in construction as the available 6L6.This is another reason why your new RECT-O 50 amplifi er was shipped with 6L6 power tubes. If you plan to use the EL34’s we suggest that you keep a full set of tubes and extra fuses with you during all performances in the event of a tube failure occurring when using the currently available EL34’s.

Make sure that the BIAS Switch is set correctly to match the tube type that you are using. Failure to

do this will result in tube failure that could possibly burn resistors in the Bias supply. Although this is a fairly simple repair for an authorized technician, it is easily avoidable.

ALWAYS CHECK THE BIAS SWITCH setting if you experiment with alternate tube types and you will enjoy uninterrupted performances from your amplifier.

EFFECTS LOOP: SEND, RETURN & MIX These two 1/4” jacks are the patch point for external signal processing effects. The

EFFECTS LOOP in the RECT-O 50 is wired in parallel with the unaffected or dry signal which enables you to preserve the integrity

			of the all tube tone and feel that the RECT-O 50 is capable of delivering. To use the EFFECTS
			LOOP for your processors, simply connect the Effects Loop SEND jack to your fi rst effects’ Input
		FX LOOP	jack. Connect your last effects Output jack to the Effects Loop RETURN jack.
FX MIX		RETURN	SEND
			Use the rotary MIX Control to blend in the desired amount of the processed signal with the original
10%	90 %		dry signal. The least degradation of signal is usually found by setting the processor’s mix at 100%
		WARNING: To reduce risk of fire or	and the EFFECTS LOOP MIX Control at the lower end of the control. In this manner the least
			amount of your pure tone will be processed and you will be dialing in a “very small amount” of a
		electric shock, replace fuse with
		same type and rating only. Do not
		expose this unit to rain or moisture.

“very wet” signal to be mixed with the original. This method seems to produce the best results for tone and signal to noise ratio. The EFFECTS LOOP interrupts the signal between the pre-amp

and power section. Therefore, the RETURN jack can double as a power amp input jack. You will also want to run the MIX Control at 90% to use the EFFECTS LOOP as a Power In patch point. Connect your last effects’ Output jack to the Effects RETURN jack. We suggest that when using the RECT-O 50’s power section only, that you have the amp switched to Channel 1’s CLEAN mode or Channel 2’s MODERN mode. This assures a more neutral power sensitivity thus making the RECT-O 50 more friendly to use as a power amp. See PRESENCE Control section of this manual for more information.

These jacks allow ( usually MIDI-programmed ) operation of your amplifi er’s functions from an external switching source. The switching is accomplished by connecting ( “shorting” ) the jack’s “Tip” to its “Ring” (or ground.)

EXT. SWITCHING

SOLOCHANNEL

CAUTION: To reduce risk of fire or electric shock, do not remove cover. No user- serviceable parts inside. Refer

servicing to qualified personnel.

PAGE 10