The resistors mark R share the same value and set the idle current limit of the triodes, as these will see a voltage drop equal to transistor’s emitter-to-base voltage, between 0. I would love to arrive at the point where creating my posts was my top priority of the day, not something that I have to steal time from other obligations to do. Want to email me the schematic if posting here is not so convenient? Note the low voltage drop across each. See post for more details on cascode PSRR enhancement. In fact, not many cathode followers really sound good at all.

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Reasons for its staggering popularity are not hard to find. Unless you have a special need I would not add the extra stage. If high-gain was never our goal, but a medium-gain line-stage amplifier, then the following design is the better srp; to go, as it offers the same gain as the original SRPP-cathode-follower-based circuit, but delivers a greatly improved PSRR due to the Aikido cathode follower output stage.

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See post for more details on cascode PSRR enhancement. You can share your feelings about products and help other people by sharing your experience. Liste des composants Format XLS. Here is the full list: You must log in to post a review.

See post for more information on the IMC. Only those who have produced a technical white paper or written an article on electronics know just how much time and effort is required to produce 6sb7 of my posts, as novel circuits must be created, SPICE simulations must be run, schematics must be drawn, and thousands of words must be written.


The SRPP portion is laid out in a horizontal fashion. The workaround resulted in the following change. One characteristic that all my SRPP variations share, however, is the acknowledgement that the SRPP is fundamentally a push-pull power amplifier, not a single-ended gain stage.

Let’s flesh out this design in the following design example. Ideally, we should strive to limit the solid-state 6ssn7 dissipation to no more than 10W, as that amount will allow us to use a 2. For example, in the example above, the bottom triode might see a plate load greater than kohms, in spite of a 5mA idle current, with a resulting gain that approaches the bottom triode’s amplification factor.

6SN7 SRPP Preamplifier PCB (Stereo)_Bare PCB_Analog Metric – DIY Audio Kit Developer

To discover the amount of the shipping costs, you just have to go in your shopping cart once the desired products added. Tue Apr 06, 2: All of your support makes a big difference. Mon Apr 05, The higher in value this resistor is, the higher the resulting plate voltage must be to establish the idle current needed to turn on the bottom NPN transistor and the less the current flow through the bottom transistor. Click schematic for enlargement. The cascading into a cathode follower is a good design move as it input impedance is nearly infinite, so input stages isn’t dragged down; and the cathode follower’s output impedance is low.


We do, however, encounter a problem with zrpp the bottom triode, which is why there is no happy face. Sat Dec 29, 7: Thanks for the info.

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The value of the added resistor assumes that a low output impedance signal source is used, such as a CD player or DAC or MP3 player or high-quality line-stage amplifier; a 10k volume potentiometer does not count. THe constant-current source only sees a 10V voltage drop at idle, so it does not get that hot.

More importantly, the cathode xrpp value is no longer a hair-trigger mess. Click on images to see enlargements. The top triode functions as an active load for the bottom triode and its 6en7 cathode resistors magnified by the top triode’s mu, making the load impedance effectively much larger. Less is more IMHO.

AMC – Kit Preamp module SRPP tube 6SN7 – Audiophonics

The problem of having to change resistor Rak’s value ssrpp a different load impedance can be solved by using a rotary switch to select between four resistance values. I found that the triode current remained nearly constant, which meets one of the three design requirements for Super-Triode operation. In fact, not many cathode followers really sound good at all.

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