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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50pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
50pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
$22.41
Time Remaining: 5d 1h 44m
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Sophia Electric Grade B 6SN7 5692 f 300B 2A3 845 KT88 El34 6L6 tube amplifier
Sophia Electric Grade B 6SN7 5692 f 300B 2A3 845 KT88 El34 6L6 tube amplifier
$65.00
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50pc 8pin Gold Ceramic vacuum tube Octal sockets base For KT88R audio amplifier
50pc 8pin Gold Ceramic vacuum tube Octal sockets base For KT88R audio amplifier
$131.37
Time Remaining: 5d 3h 4m
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2pcs Vintage K8A 8Pin Octal Bakelite Tube Socket KT88 EL34 Tube Amplifier Parts
2pcs Vintage K8A 8Pin Octal Bakelite Tube Socket KT88 EL34 Tube Amplifier Parts
$5.20
Time Remaining: 5d 9h 13m

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Dual Bias Probes Tester Meter for Tube amplifier Biasing EL34 6L6 KT88 6BQ5 7591
Dual Bias Probes Tester Meter for Tube amplifier Biasing EL34 6L6 KT88 6BQ5 7591
$49.95
Time Remaining: 5d 9h 42m
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HiFi KT88 Vacuum Tube Integrated Amplifier Single Ended Stereo Power Amp 18W2
HiFi KT88 Vacuum Tube Integrated Amplifier Single Ended Stereo Power Amp 18W2
$475.00
Time Remaining: 5d 11h 10m
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DC100mA Panel Meter 2A3 300B KT88 Vintage Valve Tube amplifier CD Player DIY2
DC100mA Panel Meter 2A3 300B KT88 Vintage Valve Tube amplifier CD Player DIY2
$19.50
Time Remaining: 5d 12h 5m
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EL156 KT88 300B 2A3 25W 35 25K single ended tube amp output transformer 0 4 8
EL156 KT88 300B 2A3 25W 35 25K single ended tube amp output transformer 0 4 8
$99.00
Time Remaining: 5d 12h 15m
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1PC EL34 6V6 KT88 KT66 6P3P Tube AMP Stainless Steel Box Chassis Enclosure
1PC EL34 6V6 KT88 KT66 6P3P Tube AMP Stainless Steel Box Chassis Enclosure
$45.99
Time Remaining: 5d 12h 41m
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NEW 2pcs matched pair Shuguang HIFI KT88 98 Vacuum Tube for amplifier Re KT88
NEW 2pcs matched pair Shuguang HIFI KT88 98 Vacuum Tube for amplifier Re KT88
$72.99
Time Remaining: 5d 12h 47m
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PSVANE TC1 KT88 Push pull Vacuum Tube Integrated Amplifier Stereo HiFi Power Amp
PSVANE TC1 KT88 Push pull Vacuum Tube Integrated Amplifier Stereo HiFi Power Amp
$930.00
Time Remaining: 5d 16h 31m
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Integrated KT88 Push Pull Vacuum Tube Amplifier Stereo HiFi Headphone Amp 35W2
Integrated KT88 Push Pull Vacuum Tube Amplifier Stereo HiFi Headphone Amp 35W2
$650.00
Time Remaining: 5d 17h 21m
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Douk Audio KT88 Vacuum Tube Amplifier Single ended Stereo Integrated Amp 18W+18W
Douk Audio KT88 Vacuum Tube Amplifier Single ended Stereo Integrated Amp 18W+18W
$430.00
Time Remaining: 5d 17h 35m
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1PC 300B EL34 2A3 KT88 KT66 Tube AMP Stainless Steel Box Chassis Enclosure
1PC 300B EL34 2A3 KT88 KT66 Tube AMP Stainless Steel Box Chassis Enclosure
$45.99
Time Remaining: 5d 17h 46m
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MINGDA MC368 B902 KT90 KT88 TUBE SINGLE ENDED CLASS A INTEGRATED TUBE AMPLIFIER
MINGDA MC368 B902 KT90 KT88 TUBE SINGLE ENDED CLASS A INTEGRATED TUBE AMPLIFIER
$1,099.00
Time Remaining: 5d 18h 2m
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4pcs matched quad Shuguang HIFI KT88 98 Vacuum Tube Valve for amplifier Re KT88
4pcs matched quad Shuguang HIFI KT88 98 Vacuum Tube Valve for amplifier Re KT88
$138.99
Time Remaining: 5d 22h 36m
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PAXTHON TUBE AMPLIFIER VTA 100 NEW 4X KT 88 98 NEW 110 WATTS NEW
PAXTHON TUBE AMPLIFIER VTA 100 NEW 4X KT 88 98 NEW 110 WATTS NEW
$599.99
Time Remaining: 5d 23h
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2pc Tube amp bias tester for el34 6v6 6l6 kt88 6550 5881 7024 mVtest mode
2pc Tube amp bias tester for el34 6v6 6l6 kt88 6550 5881 7024 mVtest mode
$26.90
Time Remaining: 5d 23h 6m
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20pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
20pc 8pin Tube Retainer sockets Valve Clamp KT88 6L6 EL34 Guitar Tube Amplifier
$12.05
Time Remaining: 6d 3h 4m
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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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