23 Line Out - 0 dB Poweramp Signal:
This port taps the power amp's output to provide a line out
signal configured at a level of about 0 dB.
The frequency response is identical to that of the
power amp output signal. In other words, its frequency response has not been compensated
or corrected.
You can feed this signal to another linear power amp. Another option is to patch it through an
outboard filter to emulate a speaker, for example, a 4x12 cabinet simulation, and feed this
externally processed signal to a recording device or PA system.
24 Poweramp Output 8 Ohms, internal speaker:
This 8-ohm speaker out is wired in parallel with
port 25. Connect an 8-ohm cabinet or, in the case of the E300 Combo, its internal speaker to it.
25 Poweramp Output 8 Ohms parallel:
This 8-ohm speaker out is wired in parallel with port 24.
Use it in combination with port 24 to connect two 16-ohm cabinets.
26 Poweramp Output A -16 Ohms serial:
16-ohm speaker out, connected internally in series with
Output B (jack 27). Connect a 16-ohm cabinet here (Output A). Two 8-ohm speakers are connected
to Output A (jack 26) and Output B (jack 27), for example a combination of the internal 8-ohm
speaker of the Combo E300 and an external 8-ohm cabinet, e.g. the ENGL models E112 or E412.
CAUTION:
If you intend to use a 16-ohm cabinet only, make absolutely certain you connect it to
Output A (jack 26).
Output B (jack 27) is only enabled when a speaker is connected to Output A (jack 20).
27 Poweramp Output B - 16 Ohms serial:
This is an auxiliary output connected in series with Output A
(jack 26). This output is designed for one application for only—when you are driving a combination
of two 8-ohm cabinets/speakers. This output may only be used when an 8-ohm speaker is
connected to Output A (jack 26).
NOTE:
Never operate the amplifier without a sufficient load, otherwise you may damage or
destroy the power amp!
Speaker/ cabinet options:
You can connect one 8-ohm cabinet (or the Combo's internal speaker) to the 8-Ohm Output (24);
or two 16-ohm cabs to the two 8-Ohm Outputs (ports 24 and 25);
or one 16-ohm cab to Output A (port 26);
or two 8-ohm cabs to Output A and B (ports 26 and 27).
Tube array:
Output Transformer
Power
Transformer
Input
E305 Chassis
(Head)
chassis viewed
from above
V 1
ECC83/
12AX7
V 2
EL84/
6BQ5
Reverb Connector
V 3
EL84/
6BQ5
V 4
EL84/
6BQ5
V 5
EL84/
6BQ5
Output Transformer
Power
Transformer
Input
E300 Chassis
(Combo)
chassis viewed
from above
V 1
ECC83/
12AX7
V 2
EL84/
6BQ5
Reverb Connector
V 3
EL84/
6BQ5
V 4
EL84/
6BQ5
V 5
EL84/
6BQ5
Reverb Connector:
red plug:
reverb spring input
black plug:
reverb spring output