OddWatt Audio 5751 SRPP / KT88 Push-Pull Monoblock Tube Amplifier Kits


Posted on Feb 4, 2014

One of the advantages of hosting a hobby website is that you meet people through email who have similar interests as you. Ever since we posted Bruce`s first OddWatt project on the site I have communicated with a number of DIY hobbyists who have built the various OddWatt amplifiers and have had nothing but very positive comments about the sonic qua


OddWatt Audio 5751 SRPP / KT88 Push-Pull Monoblock Tube Amplifier Kits
Click here to download the full size of the above Circuit.

lities of these tube amps. The kits are available in two versions, KT77 rated at 15 watts and KT88 rated at 25 watts which I decided to try. The monoblock tube amp kits arrived about two weeks after placing the order in two double boxed packages, each package weighing about 6. 4 kg (14 lbs. ). The kits were well packaged and there was no damage to the contents. Not shown in the photograph is the comprehensive assembly manual which was provided through email. All the parts required to build the tube amp are included. For tools you will need a soldering iron, screwdriver, pliers and wire stripper / cutter. The enclosure is powder coated steel and includes a removable vented cover which can be used to keep curious hands and paws away from the very hot vacuum tubes. The amplifier schematic is shown in Figure 1. Please note that this circuit is © OddWatt Audio and permission to host the schematic on this site has been provided by OddWatt Audio. You are free to use the schematic for personal, non-commercial use. The voltage gain (input) stage is a common Shunt-Regulated Push-Pull (SRPP) amplifier using a 5751 miniature dual triode valve. Other input tubes can be used in the driver stage, the closest match being a 12AX7 which will provide more gain. 12AU7, ECC82 and ECC802S can also be used but will not be able to provide sufficient gain to drive the KT88 tubes to full power. Bruce indicated that the 5751 provided the best...




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