Tube amps: build, repair, modify

I’ve run across 7 names for different phase inverter circuits, but have only found 4 in the guitar amp schematics that I’ve looked at, The purpose of a phase inverter is to provide 2 signals that are 180 degrees out of phase with each other, These signals drive each half of a push-pull power tube pair, Longtail pair, Longtail pair, The long-tailed pair is perhaps the most common, and was used

The Phase inverter! The most important tube in your amp?

The phase inverter can use various circuits, and the gain of this position in the circuit can vary from less than 1 split-load/cathodyne inverter by itself to ~1/4 of Mu long-tail pair, as used in most amps to ~1/2 Mu paraphase inverter, but just the first triode; second should have “no gain” or roughly the same result as the long-tail when considering the effect of both triodes,

Phase Inverter – What it Does and How it Works

Of all the circuits in a tube amplifier, the Phase Inverter, also known is the Phase Splitter, is the most difficult to understand by even some experienced techs, Its function is relatively simple: take a signal input, and create two outputs, one that is identical e,g, in-phase to the original, and another that is a mirror-image phase-inverted or flipped phase, Each signal feeds a power

Tube amp Theater How to build modify Fender Phase inverter

Modification of a Univox U-320 tube guitar amp, This amp had low gain, The solution was upgrading the inverter for more gain, This is also the premiere of Me

Hiwatt Fixed-Bias Phase Inverter

The DC Circuit

Improving the Phase Inverter,

These are not meant to cover all possible phase inverter circuits, The two circuits are representative of the two most used circuits, the SLPI split load phase inverter a, and the LTP long tail pair b, Figure 1a is often found with a coupling capacitor between the plate of the first tube and the grid of the second, In this case other means are provided for biasing the second tube, Also the

What tube for Phase Inverter?

No, we’ll explain, Most all circuits using long tail phase inverters are designed with a slight amount of asymmetry, The reason for this is because when both sides are dead on, the amp will sound a bit sterile and be missing that bit of 3D swirl that makes a tube amp sound alive, This is also the case with a way out of balance circuit, it will sound sterile and certain frequencies will

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Ampeg Plate Follower Phase Inverter

The Ampeg M-15 Circuit, Ampeg’s phase inverter is a bit more complex, but implements the same concept: a second-stage voltage amplifier that inverts the signal without amplifying it, The FB input is feedback from the 8Ω tap of the output transformer secondary, The cathodes share a fully bypassed 1kΩ cathode resistor, which matches Fender’s configuration, but a 240Ω resistor is added to the

12AX7 as a phase inverter tube?

I purchased an inexpensive 15W Tube amp for my 12YO Grandson It is of Chinese manufacture w/ 2 ea, 6V6 power tubes is a 12AX7 in the phase inverter socket It has a solid state preamp, Does it matter what brand / value of 12A** tube you …

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Phase Splitters

This phase-splitter is also called “anode follower” or “see-saw”, This splitter takes the signal out of the 1st tube, passes it through a voltage divider and injects it into another tube to obtain the inversed signal, The second schematic is a simplified version that can be used when the following tubes have no grid current, Example at 6V6GT amp,

Amp Voicing

In a push-pull amp the guitar audio signals on the two phase inverter plates are 180 degrees out of phase with one another so mixing the two signals together nullifies the signal, kind of like mixing matter and antimatter, The snubber also aids amplifier stability, If your amp already has a phase inverter plate snubber you can increase its size to trim ice pick highs and overdrive fizz, You

7591 tubes

Hoffman Amplifiers Tube Amp Forum, 7591 tubes, Welcome To the Hoffman Amplifiers Forum November 09, 2021, 08:38:40 pm: One of my amps is a dumble type preamp and phase inverter into cathode biased push pull 7591 power tubes, It is very robust sounding, with more clean volume than a Fender deluxe reverb, The power tube circuit and transformers are taken from an old …

6SL7 SRPP / KT77 Push-Pull Class-A Ultra-Linear DIY Tube

Figure 1: 6SL7 SRPP / KT77 Push-Pull Tube Amp Schematic, The basic circuit is the same as in the earlier project, I If you look at the stage carefully, you will see the output stage looks a lot like the phase inverter used as a driver in more conventional amps, There are a few drawbacks to the SIPP stage as well, There’s no such thing as a free lunch in electronics, The stage operates in

Add Reverb & Tremolo

The reverb circuit is inserted just before a guitar amplifier’s phase inverter in a push-pull amp or just before the driver last gain stage before the power tube in a single ended amp, If your power transformer doesn’t have a 40v bias tap you can use this Hammond 187D36 36 volt transformer instead and connect its second power lead to the Power Supply Board’s ground bus shown at bottom left