Give us a nitelite Pic please. Want to see how those tube's light up. Building a tube Amp now that uses KT 90s. Kind of disappointed not much of a light show.
Be patient
I wish I can do more .
I only have two hands.
Please stage tuned in the coming few days
I wish I can do more .
I only have two hands.
Please stage tuned in the coming few days
I feel this amp is very powerful but I do not have the spec until now. Yes.. it can drive drive a lot of speakers
Here is the spec of TU-8888 (for now).
Specifications
Tubes:
Voltage amplifying tube: EF86(6267)x1, ECC82(12AU7, 6189)x1
Power tube: 6550, KT88, KT90, KT120, KT150, KT170, etc
Circuit configuration: Vacuum tube mono block power amplifier
Output stage: Class-AB push-pull, manual adjustment fixed bias
Heater power: Voltage amplifying tube: DC power
Output tube: AC power
B-power: MOSFET ripple filter
Max.output (8ohn load, THD10%):
60W (with KT150 or KT170)
50W (with KT88)
Rated input: 1Vrms (With KT150 or KT170)
950mV rms (with KT88)
Frequency response (-3dB): 10-50,000Hz
Residual noise (IHF-A, 8 ohm load): 50uV rms
Input terminal: RCA jack x 1
Output terminal: 8ohm, 4ohm Binding terminal (gold-plated, banana plug compatible)
* Both + and - terminals are insulated from the amplifier circuit and the chassis ground.
Rated power voltage: 100V AC / 115V AC / 230V AC (selectable upon assembly), 50/60Hz
IEC standard 3P inlet
Rated consumption power:
150W (max. with KT170), 100W (with no signal, with KT170)
130W (max. with KT170), 90W (with no signal, with KT88)
Dimensions: W332 x H214 x D308 mm (incl.projections)
Weight: Approx.10.2kg (assembled, excl.tubes and a power cord)
Here is the spec of TU-8888 (for now).
Specifications
Tubes:
Voltage amplifying tube: EF86(6267)x1, ECC82(12AU7, 6189)x1
Power tube: 6550, KT88, KT90, KT120, KT150, KT170, etc
Circuit configuration: Vacuum tube mono block power amplifier
Output stage: Class-AB push-pull, manual adjustment fixed bias
Heater power: Voltage amplifying tube: DC power
Output tube: AC power
B-power: MOSFET ripple filter
Max.output (8ohn load, THD10%):
60W (with KT150 or KT170)
50W (with KT88)
Rated input: 1Vrms (With KT150 or KT170)
950mV rms (with KT88)
Frequency response (-3dB): 10-50,000Hz
Residual noise (IHF-A, 8 ohm load): 50uV rms
Input terminal: RCA jack x 1
Output terminal: 8ohm, 4ohm Binding terminal (gold-plated, banana plug compatible)
* Both + and - terminals are insulated from the amplifier circuit and the chassis ground.
Rated power voltage: 100V AC / 115V AC / 230V AC (selectable upon assembly), 50/60Hz
IEC standard 3P inlet
Rated consumption power:
150W (max. with KT170), 100W (with no signal, with KT170)
130W (max. with KT170), 90W (with no signal, with KT88)
Dimensions: W332 x H214 x D308 mm (incl.projections)
Weight: Approx.10.2kg (assembled, excl.tubes and a power cord)
That's serious wattage right there! I'm intrigued - although I have built my entire listening setup around the low wattage of other Elekit products so this might be a reason to try some new speakers lol!
There is no doubt i love low power amp but this amp is something very special.
Looks great. Are you going to release an acrylic top plate?
Edit: I just realised this might be tricky given the fixed bias dial etc?
Edit: I just realised this might be tricky given the fixed bias dial etc?
i will offer acrylic top plate with the kit.
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Hi Victor, can you tell us a little bit about the amp now - I.e is it triode or UL and how much feedback it has?
Here is the spec of TU-8888 (for now).
Specifications
Tubes:
Voltage amplifying tube: EF86(6267)x1, ECC82(12AU7, 6189)x1
Power tube: 6550, KT88, KT90, KT120, KT150, KT170, etc
Circuit configuration: Vacuum tube mono block power amplifier
Output stage: Class-AB push-pull, manual adjustment fixed bias
Heater power: Voltage amplifying tube: DC power
Output tube: AC power
B-power: MOSFET ripple filter
Max.output (8ohn load, THD10%):
60W (with KT150 or KT170)
50W (with KT88)
Rated input: 1Vrms (With KT150 or KT170)
950mV rms (with KT88)
Frequency response (-3dB): 10-50,000Hz
Residual noise (IHF-A, 8 ohm load): 50uV rms
Input terminal: RCA jack x 1
Output terminal: 8ohm, 4ohm Binding terminal (gold-plated, banana plug compatible)
* Both + and - terminals are insulated from the amplifier circuit and the chassis ground.
Rated power voltage: 100V AC / 115V AC / 230V AC (selectable upon assembly), 50/60Hz
IEC standard 3P inlet
Rated consumption power:
150W (max. with KT170), 100W (with no signal, with KT170)
130W (max. with KT170), 90W (with no signal, with KT88)
Dimensions: W332 x H214 x D308 mm (incl.projections)
Weight: Approx.10.2kg (assembled, excl.tubes and a power cord)
Feedback : no info
Specifications
Tubes:
Voltage amplifying tube: EF86(6267)x1, ECC82(12AU7, 6189)x1
Power tube: 6550, KT88, KT90, KT120, KT150, KT170, etc
Circuit configuration: Vacuum tube mono block power amplifier
Output stage: Class-AB push-pull, manual adjustment fixed bias
Heater power: Voltage amplifying tube: DC power
Output tube: AC power
B-power: MOSFET ripple filter
Max.output (8ohn load, THD10%):
60W (with KT150 or KT170)
50W (with KT88)
Rated input: 1Vrms (With KT150 or KT170)
950mV rms (with KT88)
Frequency response (-3dB): 10-50,000Hz
Residual noise (IHF-A, 8 ohm load): 50uV rms
Input terminal: RCA jack x 1
Output terminal: 8ohm, 4ohm Binding terminal (gold-plated, banana plug compatible)
* Both + and - terminals are insulated from the amplifier circuit and the chassis ground.
Rated power voltage: 100V AC / 115V AC / 230V AC (selectable upon assembly), 50/60Hz
IEC standard 3P inlet
Rated consumption power:
150W (max. with KT170), 100W (with no signal, with KT170)
130W (max. with KT170), 90W (with no signal, with KT88)
Dimensions: W332 x H214 x D308 mm (incl.projections)
Weight: Approx.10.2kg (assembled, excl.tubes and a power cord)
Feedback : no info
- The bias is totally manual (fixed bias)
- The microprocessor is used to measure a) bias b) balance or difference of the bias between both output tubes when the switch is pressed.
- The pots are used for setting (VR3)bias and (VR2) balancing the bias between the output tubes.
Upgrade signal path around EF86
Vcap CuTF 0.1 R1-R5 Audio Note Tantalum Resistors
Coupling Cap VCAP ODAM 0.47
Replaceed parts
Vcap CuTF 0.1 R1-R5 Audio Note Tantalum Resistors
Coupling Cap VCAP ODAM 0.47
Replaceed parts
WE use 43% of the OPT's capacity. IT is far less for the power tube (KT170).
LL3733 is a custom madeOPT for TU-8888The LL3733 is a push-pull tube amplifier output transformer with 50% UL taps and a separate winding for 2%. NFB. The transformer is built up from two coils....
Pin2 UL1
Pin10 UL2
LL3733 | |
| Turns ratio in application | 33:1 for 5.4kn : 5n 25:1 for 5kn : 8n |
| UL tap | 50% from B+ |
| Feedback winding (split between coils) | 2% (50:1) |
| Static resistance of primary (primary windings in series as indicated below) | 250 n |
| Static resistance of secondary (secondary windings connected as indicated below) | 0.3 n for GND -- 5 n 0.5 n for GND -- 8 n |
| Primary Inductance | 270H |
| Primary leakage inductance (primary connected as below, secondary short circuited) | 22mH |
| Max recommended primary DC current through windings (heat dissipation 7W) | 170 mA (Max 340mA DC from B+) |
| Max. primary signal voltage at 30 Hz | 850V RMS |
| Frequency response (source 1.5k, load 8 ohms, ref. 1kHz) | +0 / - 2 dB: 5Hz – 30kHz |
| Max output power at 30Hz | 140W |
| Signal loss across transformer | 1 dB |
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