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 Vintage Octal 8Pin Bakelite Tube Socket KT88 EL34 5Y3 Tube Amplifier Parts
2pcs Vintage Octal 8Pin Bakelite Tube Socket KT88 EL34 5Y3 Tube Amplifier Parts
$9.34
Time Remaining: 6d 8h 4m
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2pcs Ceramic 8Pin K8A Tube Socket Octal PCB Mount KT88 EL34 6SL7 Tube Amplifier
2pcs Ceramic 8Pin K8A Tube Socket Octal PCB Mount KT88 EL34 6SL7 Tube Amplifier
$7.50
Time Remaining: 6d 8h 22m
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Brand New 100mA Panel Meter For 300B 211 845 6550 EL34 KT66 KT88 Tube Amplifier
Brand New 100mA Panel Meter For 300B 211 845 6550 EL34 KT66 KT88 Tube Amplifier
$6.49
Time Remaining: 6d 9h 10m
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Pair Vintage 6SN7GTB Tubes for Western Electric 300B 2A3 45 El34 KT88 amplifier
Pair Vintage 6SN7GTB Tubes for Western Electric 300B 2A3 45 El34 KT88 amplifier
$59.99
Time Remaining: 6d 14h 59m
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Single ended KT 88 triode class A Vacuum tube amplifier with DC heaters
Single ended KT 88 triode class A Vacuum tube amplifier with DC heaters
$200.00
Time Remaining: 6d 15h 46m
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Meixing Mingda MC368 B Vacuum Tube Amplifier KT88 Brand New
Meixing Mingda MC368 B Vacuum Tube Amplifier KT88 Brand New
$999.00
Time Remaining: 6d 16h 42m
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4x NOS 6J1 tube for Dynaco El34 El84 6V6 2A3 300B KT88 amplifier Headphone Pre
4x NOS 6J1 tube for Dynaco El34 El84 6V6 2A3 300B KT88 amplifier Headphone Pre
$9.99
Time Remaining: 6d 18h 31m
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Black Gate 100uf 100v capacitor for 845 300B 2A3 45 El34 KT88 6L6 tube amplifier
Black Gate 100uf 100v capacitor for 845 300B 2A3 45 El34 KT88 6L6 tube amplifier
$99.99
Time Remaining: 6d 18h 31m
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TUNG SOL 6550 KT88 Black Plate OOO Getter Amplifier VACUUM TUBE Tested K3541
TUNG SOL 6550 KT88 Black Plate OOO Getter Amplifier VACUUM TUBE Tested K3541
$149.95
Time Remaining: 6d 20h 27m
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2 Classic New Winged C KT88 Amplifier Tubes Tested GOOD by Vintage Tube Services
2 Classic New Winged C KT88 Amplifier Tubes Tested GOOD by Vintage Tube Services
$49.95
Time Remaining: 6d 20h 51m

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tube amplifier Bias tool tester adapter Meter for EL34 KT88 6l6 EL84 6BQ5 6P1
tube amplifier Bias tool tester adapter Meter for EL34 KT88 6l6 EL84 6BQ5 6P1
$8.90
Time Remaining: 7d 2h 57m
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100PCS For EL34 KT88 274B 8 PIN ANALOG AUDIO AMPLIFIER Ceramic TUBE SOCKET8PC
100PCS For EL34 KT88 274B 8 PIN ANALOG AUDIO AMPLIFIER Ceramic TUBE SOCKET8PC
$120.64
Time Remaining: 7d 2h 59m
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Panel Meter Analog DC 200mA Move Coil 845 2A3 300B KT88 6550 KT66 211 Tube AMP
Panel Meter Analog DC 200mA Move Coil 845 2A3 300B KT88 6550 KT66 211 Tube AMP
$10.59
Time Remaining: 7d 3h 27m
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50pc Ceramic Tube Socket K8A 8Pin PCB 6550 EL34 6SN7 KT88 6L6 For Tube Amplifier
50pc Ceramic Tube Socket K8A 8Pin PCB 6550 EL34 6SN7 KT88 6L6 For Tube Amplifier
$82.88
Time Remaining: 7d 8h 38m
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Raphaelite 400W Power Transformer For DIY 6550KT88EL34 push pull tube amp
Raphaelite 400W Power Transformer For DIY 6550KT88EL34 push pull tube amp
$128.00
Time Remaining: 7d 8h 54m
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6550 KT88 Class A Single Ended Tube Audio Amplifier 16W2 HIFI DIY Kit
6550 KT88 Class A Single Ended Tube Audio Amplifier 16W2 HIFI DIY Kit
$345.00
Time Remaining: 7d 14h 52m
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6 Apex Matched JJ Electronic KT88 Power Tubes for Tube Amplifiers
6 Apex Matched JJ Electronic KT88 Power Tubes for Tube Amplifiers
$234.00
Time Remaining: 8d 23m
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50PCS For EL34 KT88 274B 8 PIN ANALOG AUDIO AMPLIFIER Ceramic TUBE SOCKET8PC
50PCS For EL34 KT88 274B 8 PIN ANALOG AUDIO AMPLIFIER Ceramic TUBE SOCKET8PC
$58.66
Time Remaining: 8d 4h 11m
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Panel Meter Analog DC 100mA Move Coil 52mm 845 2A3 300B KT88 EL34 211 Tube AMP
Panel Meter Analog DC 100mA Move Coil 52mm 845 2A3 300B KT88 EL34 211 Tube AMP
$10.99
Time Remaining: 8d 4h 54m
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Goldmund signal cables for Western Electric 845 300B 2a3 KT88 tube amplifie
Goldmund signal cables for Western Electric 845 300B 2a3 KT88 tube amplifie
$1,499.99
Time Remaining: 8d 4h 57m
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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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