While drawing the above schematic, the following SRPP power amplifier came to mind. The output tube receives its input signal from the input tube and no capacitor connects the output tube’s cathode to the input stage. Wanted to let you know that this is simply the best PCB I have had in my hands, bar none. I began with a good-sounding, passive line-stage preamp that used a fine 20k stepped attenuator filled with carbon-film resistors that sounded fuller than other passive line stages that I have constructed before. And yet they are frowned upon by many “High End” audio builders. NFB due to the ‘cathode follower’ connection. The source resistor should be as high as possible on the one hand but cannot be made to high since it needs to pass 0.

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In general, this tube is operated in A2 mode where the grid draws considerable current. V with a positive voltage on the grid resulting in a massive standing current. My aim achievement was v at mA into a 10 k load to theoretically provide 98 watts at 2nd harmonic of 6. This is surprisingly difficult when extremely linear output tubes are being used, such as the 2. I have a few things to say about it.

Or, perhaps, better still, we would replace the single input triode with a cascode made up of carhode triodes. There you are chaps! If you can use a transformer, you do not want a WCF.

Sun Jun 19, 7: TCJ My-Stock DB helps you know just what you have, what it looks like, where it is, what it will be used for, and what it’s worth. One thought is that a push-pull output transformer, one without an air-gap, could be used, as long as it held two separate primary windings.


Understand that if we do not use a cathode-resistor bypass capacitor, then the current-sense resistor, Rs, must be larger in value.

Someone who is fluent in Italian and English and has some time could do a great service by assisting him in translations. Although, if two large-valued power-supply capacitors were used in series, as shown above, we could get away with the single Vdc power-supply rail, as the nexus between the two capacitors defines a low-impedance point.

Choke Cathode Follower Driver | softtoti

For those of you who still have old computers running Windows XP bit or any other Windows bit OS, I have setup the download availability of my old old standards: Presently just using the trusty Panasonic Pot.

Hcoke kept thinking what a shame it is that the OPS can only avail itself to half of the potential power-supply voltage. I wish everyone did business like you.

Yet the cathode follower produces far less distortion and a much lower output impedance than the comparable grounded-cathode amplifier does when working into the same load.

PM me with an email that accepts modest-sized attachments and I can send you some schematics simplified onesit’s not like I’ve built these latest topologies!

Additionally, the passive line- stage does not require plugging into the wall and it adds no extra active devices into signal path. For instance, in phono preamps, you often see a CF between the last voltage gain stage and the volume potentiometer. I had some time to experiment with the cnoke follower amp. October 20, In addition, the V power-supply connection must be a low-impedance point.


Well, here is a hybrid Triadtron I-to-V converter. Second, your shipping was lightning-quick. Nonetheless, it’s probably a pretty good preamp. The peak negative current swing is shown fllower. And if we try to get clever and add a negative feedback loop from the plate to the driver tube, we make the problem worse, as we have effectively reduced the output tube’s plate resistance, which in turn gives the primary a larger share of the power-supply noise, making the PSRR worse, not better.

Amp Chokes, Cathode Followers, and other Maplifier Questions

The transformer-coupled version is also twice as efficient as the constant-current version, as an output transformer functions much like a constant-current source, but without the large wasteful voltage drop. The solution to this problem is quite simple: Click on image to see enlargement So what is required to make a good tube-based unity-gain buffer? Other than by building up the circuit and measuring the results? In this case, I did so to show what is possible, not necessarily to show what is preferable.

The negative peak output voltage swing is equal to the remainder of the peak current flow minus the idle current flow against the plate resistor’s resistance.