Enjoying listening to an octal Sylvania 6SL7WGT tube, maybe from January 1952 or more likely 1962 (date code A2B). Not as super detailed as the 6DJ8 family, but very sweet and musical and non fatiguing.
Since the 6SL7 is the American equivalent to the Russian 6H9S/6N9S tube, did I partially upgrade the MKIII to the MK9 Little Dot amp?
Here is the advertising for the MK9 (English needs improvement):
- Little Dot MK9 is that uses a electronic tube as a headphone amplifier. It uses 3 tubes (before: 6N9P, after class: 6080*2) were used as two stereo left and right channel amplifier. The input signal is the audio signal from the CD player or decoder, an amplified output signal used to drive headphones. The machine also has a road as a RCA signal output by the first stage, supply other amplifier as before use.
- MK9 uses tube amplification circuit in the electronic is relatively rare in the SEPP single ended push-pull, OCL no output capacitor direct coupled power amplifier circuit.
- The circuit output dynamic than the cathode output generally large (undistorted swing: 30Vp-p), due to the cancellation of the output capacitance, low frequency response can dive deeper, more solid, soprano Alto can be more transparent.
- But to make the circuit in the case of direct coupled DC level is zero, need symmetrical supply complex. In order to stabilize the operation of the circuit, and the machine also adopts a "zero servo tracking circuit".
- In order to ensure the safety of the output load, relay protection circuit and output protection special chip. The machine output tube uses a new production of the United States of America RCA company 50 years Antique Tube (ONS), is one of the best sound similar tube in the world.
(The 6080 RCA tubes are rated at 6.3V and 2.5 A and are plentiful on Ebay for $10 or less. )
Is it possible to add the protective circuit so that I can use a DC coupled ss amp with the the MKIII? It would have to be an outboard plug in style chip since I am not capable of opening the amp and solder in a circuit.