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CK²III gallery - Page 2
jore's CK²III
This CK²III by jore is housed in an attractive case from Taiwan.
Like coffin's build, the onboard voltage regulators are bypassed
in favor of an Ultimate Mini Regulator PSU board, as is the use of an
oversized toroidal transformer. The amplifier output transistors and
the PSU's pass transistors are also bolted to the bottom of the case.
Jore used a AD8066 opamp for the DC servo and a stepped attenuator
for the volume control. Many axial capacitors are used instead of
radial lead that the circuit board was designed for.
jore1.jpg
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jore2.jpg
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jore3.jpg
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jore4.jpg
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jore5.jpg
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jore6.jpg
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jore7.jpg
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jore8.jpg
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CK²III by kklee
All housed in a Hammond 1455Q2202 enclosure, this CK²III by kklee
has both RCA phono jacks and a 3.5" miniature phone jack for the
input. This allows the amp to be used with standard "home"
sources or portables players. The volume control is an Alps RK27
and the headphone jack is a Neutrik locking jack. The fused IEC
power entry module and power switch are located at the rear.
kklee1.jpg
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kklee2.jpg
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kklee3.jpg
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kklee4.jpg
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kklee5.jpg
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kklee6.jpg
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kklee7.jpg
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kklee8.jpg
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alfie's balanced CK²III
Alfie from Italy built a unique 4-channel balanced amplifier using two
CK²III boards. There are three enclosures: the main amplifier case,
the power transformer case, and a single-ended to balanced converter.
The converter is needed because alfie currently only has unbalanced sources.
The main amplifier case is from
HiFi-2000 (Galaxy Maggiorato 28x23).
All connectors are from Neutrik. The volume control is a 4-gang
23-position stepped attenuator from
diyfidelity.com.au.
alfie1.jpg
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alfie2.jpg
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alfie3.jpg
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alfie4.jpg
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alfie5.jpg
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alfie6.jpg
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alfie7.jpg
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alfie8.jpg
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CK²III by seroxatmad
Seroxatmad's CK²III is housed in a Hammond 1455Q2202 enclosure,
with a mesh screen top cover cut from a magazine rack. Inside, the
electrolytic capacitors are Panasonic FC and FM types, all resistors
are 0.6W 1% metal film, and the volume potentiometer is an Alps RK27.
Small heatsinks were added to the output transistors. The first two
photos are the latest with a custom front panel by
Front Panel Express,
the remaining photos are with the original Hammond panel.
seroxatmad1.jpg
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seroxatmad2.jpg
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seroxatmad3.jpg
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seroxatmad4.jpg
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seroxatmad5.jpg
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seroxatmad6.jpg
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seroxatmad7.jpg
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seroxatmad8.jpg
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cotdt's CK²III
This is cotdt's build in a Hammond 1455Q2202BK enclosure, with custom
rubber feet (not shown). The front panel has two sets of headphone jacks,
and a vintage 50KΩ stepped attenuator. The rear panel contains a
toggle power switch, IEC power entry module with fuse, line input and
preamp output RCA jacks. The panel text are white on black labels,
printed on a laser printer.
The CK²III board features MUR820 rectifiers in the power supply,
and Black Gate bipolar capacitors (red 10µF) for the DC servo.
The output transistors are heatsinked and adjusted to 45mA quiescent
current. The gain of the amp is set to 4.1x.
cotdt1.jpg
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cotdt2.jpg
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cotdt3.jpg
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cotdt4.jpg
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cotdt5.jpg
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cotdt6.jpg
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cotdt7.jpg
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cotdt8.jpg
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CK²III by Weeghel
Weeghel of the Netherlands had not built anything in a long time,
and decided on the CK²III as a good project to fire up the
soldering iron again. The amplifier is housed in a Monacor chassis
that was left over from a previous project. The build features a
Neutrik locking headphone jack, 1% 0.6W metal film resistors,
low ESR capacitors and Wima film capacitors. Heatsinks are used on the
output transistors. Even the opamp got a heatsink. The output stage
quiescent current was adjusted to 35mA. A ground loop breaker was
also installed to prevent hum.
Weeghel says that the CK²III is a good match for his Beyerdynamic
DT-931 headphones.
Weeghel1.jpg
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Weeghel2.jpg
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Weeghel3.jpg
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Weeghel4.jpg
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Weeghel5.jpg
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Weeghel6.jpg
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