BOGNER AMPLIFICATION
5
g) Post FX Loop or Volume Boost
21), 37), 38), 39), 40), 41), 42)
This loop is between pre and power amp and can be used to hook up further effect units or you can use it
as a volume boost.
To avoid coloration of your tone and feel, it is important to set the levels correctly. The loop has a push
button switch for +4db or -20db level, commonly -20db is used for input sensitive effects like pedals while
+4db works well for line level and rack effects.
You have the choice of either using the loop in parallel or series mode. In parallel your effects get mixed
via the Post Fx control to the internal dry signal. In series the entire preamp signal gets routed through the
effects unit and the Post FX control works as a volume control.
Please note that volume pedals only work in the series mode.
The loop can be engaged via the on off switch on the back panel or via the foot controller,
Please note that with the foot controller connected the switch (37-Loop On/Off)) on the amp must
be set to on (Out)! This is unique in the way that it is the opposite with all of our other amplifiers!!
To use the Post FX loop as a volume boost, it is best to switch to parallel mode, set level to +4db and
then set the desired volume boost via the Post Fx control on the front panel.
On the back panel you will find a recessed trim pot labeled Loop Gain, to change the factory setting
(about 50%). It sets the loops return tube gain factor. In general the factory setting works for all
applications and this should not be adjusted.
Primary use would be to adjust unity volume for loop on and off in parallel mode. To adjust, you hook up
your effects unit; turn the loop on, set sensitivity via the db push button switch, set your effect to ideally
100% effect, then use the amp’s Post FX control on the front panel to dial in the amount of effect you
want. Then switch the loop on and off, if you do not have unity volume you can adjust it via the Loop Gain
trim pot while the loop is on.
While it is meant to be for the parallel mode it is also in the circuit, in the series mode, if the range of the
Post FX control is not enough, you can shift it with this trim pot.
h) Reverb
20)
The lush reverb amount can be dialed in via the Reverb control on the front panel. A 17” 3 spring tank is
used. With no foot controller hooked up the reverb is always on and can only be dialed out by turning the
Reverb control all the way down. With the foot controller hooked up you have the option to switch the
reverb in and out. Please note the 90W EL34 model does not feature reverb!
i) Speaker Outputs
44), 45), 46)
If you take the amp off Stand By, make sure you have a speaker cabinet or any other load hooked up.
Otherwise you could damage the output transformer and the power tubes. Only use a cable made for
speakers, instrument and line level cables can not be used!! The Goldfinger has a single 16 ohm output
as well as a set of dual outputs which are switchable to either 4 or 8 ohm. Make sure you set the
impedance on the amplifier so it matches the cabinet. Remember if you hook up two speaker cabinets,
they need to both have the same impedance, either both 16 or 8 ohms. Plug them into the dual output
only, then select 8 if two 16 ohm cabinets and 4 if two 8 ohm cabinets are used. The cabinets run in
parallel which halves the total impedance!!
