Elekit TU-8600R - Available only at Amp Camp and for a limited time
The TU-8600 is a 300B single-ended tube amp kit. In pursuit of the very popular sound quality of the 300B
tube, the result is an improvement to the amplification, power, and feedback circuitry of the TU-8600. The
amp has amazing sound quality, super low noise, and can also be used with headphones.
This version, available only at Amp Camp, includes Lundahl output transformers which have been specially designed for the amp.
Power circuit enhancement
A high efficiency, low magnetic flux leakage R-core is used. The rectifier consists of schottky barrier diodes that require shorter recovery time; even negligible noise spikes are reduced. The windings of the power transformer include individual windings for the filament heater (A- Power), high voltage (B-power), and bias to stabilise the Negative Feedback (NFB) circuitry (C-Power). In addition, all power is stabilised to reduce residual noise as much as possible. This results in a noise level lower than 1/10 of that of TU-8300R
Stable NFB circuit for great audio quality
To make the most of the 300B tubes the characteristics of various parts and circuits, including the OPT, have been improved. The NFB is applied to the cathode of the 300B by the third winding of the OPT as well as to the voltage amplifying stage. Consequently, the overall NFB is minimised as is any chance of a transient response.
New active automatic bias adjustment system
For the 300B tube bias, the power supply is separate and a ”New active automatic bias” is used where the amp detects plate current and automatically adjusts the grid voltage. This design delivers TU-8600 the advantages of both self-bias and fixed bias. In addition, the current detecting circuit is moved from the cathode side to the B-power side resulting in even better sound quality.
Driving 300B tubes to full power
A very orthodox design is used for the voltage amplifying stage to bring out the outstanding characteristics of the famed 300B tubes. Of special note is that 12AU7(ECC82) is used in parallel for the 2nd stage to drive the 300B tubes to full power- resulting in 200Vp-p without clipping.
Warm-up time for directly-heated and indirectly-heated tubes are different. In most designs, amp power-up starts heating both the directly heated 300B tubes (fast warm-up) as well as the indirectly-heated 12AU7 and 12AX7 (slower warm-up). In the TU-8600, the 300B tubes are heated after the indirectly-heated tubes have warmed up. This is a very tube-friendly design that will not overload tubes that have not warmed up fully. It is an important feature given the cost of 300B tubes. Your TU-8600R will be supplied with Genalex Gold Lion 300B tubes.
Output level selection for headphones
There are 4 selections of output level to match your headphones.
NB, there is limited availability of the TU-8600R. Amp Camp has secured a small number so once they are gone there will be no more.
Amp Camp TU-8600R, project including tubes: $2,430
Elekit products are supplied and supported in Australia by Tube Sound Audio. Prices are AUD and include GST.