ELEKIT TU-8888 Monoblock (available now)
Another wonderful products from Mr Fujita...PCB type DIY KIT...
Here below are the spec of the monoblock amp.
Tube usable : KT series from 88 to 170 (for output tubes) KT170 recommended
EF86 x 1 and ECC82 x 1 (driver tubes)
Max. output : Over 50W/unit (with KT170)
Manual bias adjustment - A meter at the top panel
No headphone feature
SP impedance : 4ohm and 8ohm
Input x 1
Balance adjustment volume (with 41-point click) on the rear side
Coupling capacitors : 3pcs (100n 450V x 1, 470n 630V x 2)
Max size for the coupling cap :
100n 450V ... D22 x L44 mm
470n 630V ... D20xL57 mm
* as of now and could change the spec a bit.
Tubes are not included.
*The amp is designed to use custom made Lundahl LL3733"
PCB for OPT and harnesses are included in the kit.
There are only 30 pairs or 60 pieces for USA/Canada in December
Price after Dec 15, 2024 $1,475.00 (will ship from Vancouver Canada)
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Have you listened to it yet victor ? Looks like a niche market given the combined price of (2) units . How does it compare to the current lineup ?
I will listen TU-8888 next month in ELEKIT's office. I am full of confidence Mr Fujita's design.
In fact we are moving our design to audiophile level... "Good and Afforable"
In fact we are moving our design to audiophile level... "Good and Afforable"
Victor , can you provide some impressions on the TU-8888 sound signature. Is it a clean like the 8850 or “emotional” like the TU-8900 ?
I can tell you when I have production same in mid Nov. I hope Ivan demo in CAF 2024
Just received the shipment of EF86 for TU-8888
ARRIVED few minutes ago
Custom made Lundahl LL3733 for TU-8888
Custom made Lundahl LL3733 for TU-8888
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TU-8888 How to adjust the bias
Prepare a minus screwdriver with less than 5.5mm width for adjustmen
Bias adjustment
(1) Before turning ON the power, turn “ip1 + ip2 (BIAS) ADJUSTMENT” fully to the counter-clockwise direction.
Also, set “DC BALANCE ADJUSTMENT” to the center position
(2) Turn ON the power and wait until the output tubes are warmed up. (Around 3-4 minutes for KT88, and 5-6 minutes for KT150, KT170, etc)
(3) Turn up“ip1 + ip2 (BIAS) ADJUSTMENT” gradually, adjust the volume so that the needle of the“ip1 + ip2” meter (upper scale) comes within the green
zone. The needle is not quite stable and it will swing a little but this is normal.
DC Balance Adjustment
(4) Next, adjust the DC balance. Pressing the switch button “PUSH TO BAL. ADJ.”next to “DC
BALANCE ADJUSTMENT”and turn “DC BALANCE ADJUSTMENT” until the needle comes within the green zone of the “ip BALANCE”(lower scale)”.
(5) When the amp is kept energized, “ip1 + ip2” tends to raise a little. So check the level several times,
ex., after 10 minutes and after 30 minutes, and adjust again. Energize for around 1 hour and confirm
the level becomes stable.
Then the bias adjustment is complete.
Prepare a minus screwdriver with less than 5.5mm width for adjustmen
Bias adjustment
(1) Before turning ON the power, turn “ip1 + ip2 (BIAS) ADJUSTMENT” fully to the counter-clockwise direction.
Also, set “DC BALANCE ADJUSTMENT” to the center position
(2) Turn ON the power and wait until the output tubes are warmed up. (Around 3-4 minutes for KT88, and 5-6 minutes for KT150, KT170, etc)
(3) Turn up“ip1 + ip2 (BIAS) ADJUSTMENT” gradually, adjust the volume so that the needle of the“ip1 + ip2” meter (upper scale) comes within the green
zone. The needle is not quite stable and it will swing a little but this is normal.
DC Balance Adjustment
(4) Next, adjust the DC balance. Pressing the switch button “PUSH TO BAL. ADJ.”next to “DC
BALANCE ADJUSTMENT”and turn “DC BALANCE ADJUSTMENT” until the needle comes within the green zone of the “ip BALANCE”(lower scale)”.
(5) When the amp is kept energized, “ip1 + ip2” tends to raise a little. So check the level several times,
ex., after 10 minutes and after 30 minutes, and adjust again. Energize for around 1 hour and confirm
the level becomes stable.
Then the bias adjustment is complete.
Bias Adjustment
DC Balance Adjustment
More space for coupling caps 0/47 X 2 + 0.1 X 1 per channel
DC Balance Adjustment
More space for coupling caps 0/47 X 2 + 0.1 X 1 per channel
I just have time to connect the mono block..
Eventhough , I have not upgraded any part ... It is very powerful and sound good from my ears..
Eventhough , I have not upgraded any part ... It is very powerful and sound good from my ears..