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Guitar Amp Prototype
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Posted on December 14, 2014 at 16:08:35 | ||
Posts: 10012
Location: Central Texas Joined: September 24, 2006 |
I finally got around to reworking an old Stromberg console chassis that's been hanging around my garage for a few years. Most of the components that came on the chassis were less than hi-fi quality, so I decided to turn it into a guitar amp. It's only a prototype at this stage, but its performance is nice and clean, ready for the next phase. The pre/driver has plenty of headroom, easily pushes the EL34s to the limits of the power supply. Output is about 40W peak or 30W continuous. It still needs tone controls, but there's an unused 6SL7 section that might work for that. The gain of the amp is perfect for my guitar, and it's got excellent punch and tone. The power transformer is the original Stromberg. I replaced the original 6CA4 with silicon and added a bias supply and several RC networks for the preamp circuitry. The output transformer is NOS from a Peavey Classic 30. It was originally intended for a quad of EL84s, and it measures 3.9K/8 ohms and 3.8K/16. For anyone interested, here's the amplifier schematic and a photo...
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Try it with no adjustable tone circuit., posted on December 15, 2014 at 22:04:13 | |
Think you may like this better. Use your OD pedal to taper the tone. |