Hey Guys,
So like almost a year ago now I picked up a '70 Dual Showman Reverb Head.
It had a Pre-Amp Tap mod already installed (although I did not have it documented, it did work).
This mod includes one added 1/4" output for the pre-amp tap output, and a switch on the back that basically shunts the power amp section to ground (uhh, I think).
The pre-amp tap is always active, the switch turns on/off the power-amp section (or so it appears).
So check this out...
I gigged with it last night, and I ran a 2x12 Jerry style cab with two 4-ohm JBL-E120's.
I ran one E120 from the DSR Speaker-Out (100W Tube power, like normal, non pre-amp-tap'd use, a match for the 4-ohm DSR/JBL), and ran the other E120 from the pre-amp tap to Channel A of a MosValve 962 (160W bridged @ 4-ohms).
So I crank up the DSR thru the bottom speaker and dial in a tone with the volume in the 5-6 range (I use a volume pedal, or else that would be really loud).
Then, I throw the switch so the DSR speaker turns off, and bring up the MosValve power to the top speaker, and dial in a level (I ran the volume mostly in the 12-2 o'clock range, it also has a presence knob whitch I ran pretty low as the rig is pretty bright as it is).
Then I throw the DSR speaker back on, and get a good match between the DSR speaker and the MosValve speaker.
I experimented with Pre-amp volume and mix of the two speakers a bit during the first set.
At the beginning of 2nd set, I played like the first 4 songs with just the DSR speaker, then added the 2nd speaker as the set progressed.
That was a cool way to run the rig!
So like almost a year ago now I picked up a '70 Dual Showman Reverb Head.
It had a Pre-Amp Tap mod already installed (although I did not have it documented, it did work).
This mod includes one added 1/4" output for the pre-amp tap output, and a switch on the back that basically shunts the power amp section to ground (uhh, I think).
The pre-amp tap is always active, the switch turns on/off the power-amp section (or so it appears).
So check this out...
I gigged with it last night, and I ran a 2x12 Jerry style cab with two 4-ohm JBL-E120's.
I ran one E120 from the DSR Speaker-Out (100W Tube power, like normal, non pre-amp-tap'd use, a match for the 4-ohm DSR/JBL), and ran the other E120 from the pre-amp tap to Channel A of a MosValve 962 (160W bridged @ 4-ohms).
So I crank up the DSR thru the bottom speaker and dial in a tone with the volume in the 5-6 range (I use a volume pedal, or else that would be really loud).
Then, I throw the switch so the DSR speaker turns off, and bring up the MosValve power to the top speaker, and dial in a level (I ran the volume mostly in the 12-2 o'clock range, it also has a presence knob whitch I ran pretty low as the rig is pretty bright as it is).
Then I throw the DSR speaker back on, and get a good match between the DSR speaker and the MosValve speaker.
I experimented with Pre-amp volume and mix of the two speakers a bit during the first set.
At the beginning of 2nd set, I played like the first 4 songs with just the DSR speaker, then added the 2nd speaker as the set progressed.
That was a cool way to run the rig!