So this leads me to the final topology of this 6SN7 preamp which is this: 6SN7 Preamp with parallel sections and constant current source Up next:Ĭoming up next – detailed schematic and complete project files. It wont drive 600 ohms without a transformer. In those conditions the power dissipation in the power transistor is still significant. The 6SN7 cathode follower should, if properly designed, handle a decent-sized signal (5-6Vac) into 5k or higher. For this project I will settle with a supply voltage of 200V which gives a voltage drop across the CCS of around 90V. 6SN7s in parallel in place of the single 6SN7 cathode follower shown. I must note that there is still a large voltage drop across the CCS. Note that phase splitter tubes with higher gain than a 6SN7 should not be used. It allows for a much lower supply voltage while keeping the bias of the 6SN7 unchanged. RANGE MARKER CIRCUITS HE 1 1 CIRCUITS I-CATHODE FOLLOWER BLOCKED INVERTER OSCILLATOR AMPLIFIER CATHODE FOLLOWER +300 Symbol Designation. To avoid low-frequency roll-off or phase shift, the values of C3 and C4 must be at least 4.7 uF. This prevents a loud pop when plugging connectors into the output jacks. Using a CCS as an active load has one major advantage. USING A 6SN7 In the circuit below, resistors R7 and R8 allow C3 and C4 to charge without any connection at the output. For my case I use MPSA42 and TIP48G devices. The higher working voltage requires some different types of transistors. spare octal triodes so the cathode follower input buffer was based on the 6SN7.
The other section of the 6F8G will be used as a cathode-follower buffer. I decided to target the earlier octal double triodes (6SN7 and 6SL7). In my case I use a slightly modified version to fit my 6SN7 preamp. Apparently the 6SN7 and the E元4s start to conduct before the 6F8G by about. CCS, From Sources 101, Audioxpress, 2007 by W.
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