KT88 AMPLIFIER

This diy audio project is a single ended (SE) KT88 tube amplifier. The design has been based largely around Mikael Abdellah's KT88 SE Tube Amplifier design from 2003. A schematic of the single ended KT88 amp that I have built is shown below in Figure 01.

KT88 Tube Amplifier Schematic
Figure 01: KT88 Tube Amplifier Schematic

The amplifier section is generally the same as Mikael's, but I have added a switch that will allow me to switch between triode or ultralinear operation (the original circuit is only ultra-linear). Also, the power supply to the 6N1P preamplifier section has been beefed up with the addition of a choke.


POWER SUPPLY

The power supply is based around a 5U4-GB dual tube rectifier and is shown in Figure 02 below. My friend Arnold Cruz helped me modify the PSU circuit from the original done by Mikael.

5U4-GB Tube Power Supply Schematic
Figure 02: 5U4-GB Tube Power Supply Schematic


CONSTRUCTION

Dry Fit - KT88 Tube Amplifier
Photograph 01: Dry Fit - KT88 Tube Amplifier

Enclosure Construction - KT88 Tube Amp
Photograph 02: Enclosure Construction - KT88 Tube Amp

Finished KT88 Single Ended (SE) Tube Amplifier
Photograph 03: Finished KT88 Single Ended (SE) Tube Amplifier

Parts required for the KT88 Tube Amplifier project are available from TubeDepot.


REMARKS

After I finished wiring the SE KT88 amp, I fired it up, and what a glorious sound! It has better sound than my Push Pull KT88 commercial amp. Maybe due to the SE operation.

You can swap the KT88 tubes with EL84 and the 6N1P with a 6DJ8/ECC88/E88CC. I have tried Siemens EL34, JJ EL34, and Electro Harmonix EL34 tubes. A friend lent me a pair of GEC KT88, and the amp sounded great. The KT88 tubes sound better, but they are quite expensive, the EH EL34 is 1/3 of the price, but it sounds good too! My favorite selction of tubes for this amp are an Amperex Bugle Boy 6DJ8 (in place of the 6N1P) and Siemens EL34 on triode mode. 




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2pcs 8Pin CMC Bakelite Gold Vacuum Tube Socket For EL34 6550 KT88 Tube Amplifier
2pcs 8Pin CMC Bakelite Gold Vacuum Tube Socket For EL34 6550 KT88 Tube Amplifier
$12.88
Time Remaining: 6d 10h 56m
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4pcs Tube Retainer Clip For 8pin Valve KT88 EL34 Fenders Guitar Tube Amplifier
4pcs Tube Retainer Clip For 8pin Valve KT88 EL34 Fenders Guitar Tube Amplifier
$3.60
Time Remaining: 6d 11h 31m
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2pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
2pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
$5.62
Time Remaining: 6d 11h 39m
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undrilled Aluminum Guitar Tube Amplifier DAC Headphone Preamp KT88 6550 Chassis
undrilled Aluminum Guitar Tube Amplifier DAC Headphone Preamp KT88 6550 Chassis
$29.00
Time Remaining: 6d 12h 19m
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2pc 8pin Gold Ceramic vacuum tube Octal sockets base For KT88R audio amplifier
2pc 8pin Gold Ceramic vacuum tube Octal sockets base For KT88R audio amplifier
$9.80
Time Remaining: 6d 12h 55m
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4pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
4pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
$6.27
Time Remaining: 6d 13h 3m
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Bewitch 6550 Deluxe KT88 Vacuum Valve Tube Hi end Integrated Amplifier 120v 240v
Bewitch 6550 Deluxe KT88 Vacuum Valve Tube Hi end Integrated Amplifier 120v 240v
$947.43
Time Remaining: 6d 15h 33m
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YAQIN MC 100B SV KT88 Vacuum Tube Hi end Integrated Power Amplifier 110v 240v CA
YAQIN MC 100B SV KT88 Vacuum Tube Hi end Integrated Power Amplifier 110v 240v CA
$964.10
Time Remaining: 6d 15h 53m
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YAQIN MC 50L BK KT88 Vacuum Valve Tube Hi end Integrated Amplifie export ver US
YAQIN MC 50L BK KT88 Vacuum Valve Tube Hi end Integrated Amplifie export ver US
$899.99
Time Remaining: 6d 17h 6m
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YAQIN MC 50L BK KT88 Vacuum Valve Tube Hi end Integrated Amplifie export ver CA
YAQIN MC 50L BK KT88 Vacuum Valve Tube Hi end Integrated Amplifie export ver CA
$883.76
Time Remaining: 6d 17h 8m
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YAQIN MS 110B KT88 x4 Vacuum Tube Hi end Integrated Power Amplifier 110v 240v CA
YAQIN MS 110B KT88 x4 Vacuum Tube Hi end Integrated Power Amplifier 110v 240v CA
$891.34
Time Remaining: 6d 17h 11m
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KT88 2A3 300B Tube AMP Audio Amplifier Stainless Steel Chassis Box Enclosure DIY
KT88 2A3 300B Tube AMP Audio Amplifier Stainless Steel Chassis Box Enclosure DIY
$42.99
Time Remaining: 6d 17h 12m
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YAQIN MC 50L KT88x4 ultra linear push pull Vacuum Tube Integrated Amplifier
YAQIN MC 50L KT88x4 ultra linear push pull Vacuum Tube Integrated Amplifier
$739.00
Time Remaining: 6d 18h 16m
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8pin K8A octal tube socket valve base for KT88 EL34 5881 amplifier DIY PCB mount
8pin K8A octal tube socket valve base for KT88 EL34 5881 amplifier DIY PCB mount
$14.88
Time Remaining: 6d 18h 32m
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Remote EL34 KT88 Vacuum Tube Power Amplifier Stereo HiFi Headphone Amp R8 45W
Remote EL34 KT88 Vacuum Tube Power Amplifier Stereo HiFi Headphone Amp R8 45W
$1,599.00
Time Remaining: 6d 19h 5m
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Hifi Vintage Stereo KT88 Tube Amplifier Single End Class A 18W PSVANE Upgradex1
Hifi Vintage Stereo KT88 Tube Amplifier Single End Class A 18W PSVANE Upgradex1
$620.00
Time Remaining: 6d 20h 59m
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Quad Tube amp bias tester for EL34 6V6 6L6 KT88 6550 KT120 7024mVtest mode
Quad Tube amp bias tester for EL34 6V6 6L6 KT88 6550 KT120 7024mVtest mode
$59.90
Time Remaining: 6d 21h 34m
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4x CDE 68uf 500V Capacitors for Western Electric 300B KT88 El34 tube amplifier
4x CDE 68uf 500V Capacitors for Western Electric 300B KT88 El34 tube amplifier
$19.99
Time Remaining: 6d 23h 13m
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Comments

1 Comment so far

  1. Howard on February 21, 2013 11:47 pm

    Seems like u actually fully understand quite a bit pertaining to this topic and this
    demonstrates as a result of this unique post,
    given the name “KT88 SINGLE ENDED (SE) TUBE AMP | Vintage Stereo Equipment”.
    Many thanks ,Herman

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