Aiken amps x volts

The DC voltage on the primary side of the output transformer is simply the plate voltage applied to the output tubes. It doesn't affect the voltage on the secondary side. The AC signal voltage in the primary can easily be double the static DC voltage, peak to peak. The AC voltage in the secondary can easily be calculated if you know the power the amp is producing and the impedance of the speaker:. Yes to both questions. Transformers "transform" both voltage and current.

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Content:

• ARTICLES: Articles on tube audio
• oscilloscope.
• Aiken Invader 30
• The Alteration of Resistance, Inductance and Capacity by Means of Resistance Coupled Amplifiers
• Welcome To the Hoffman Amplifiers Forum
• Cathode bias

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ARTICLES: Articles on tube audio

Username: Password:. Author Topic: Biasing Amps Read times. TomW Featherweight Posts: Does anyone here know of any decent books on biasing amps, as I have decided I want to learn how to bias my amps myself to save me from having to take them to an amp tech every time the valves need changing?

Also what equipment am I likely to need to bias my amps apart from a multimeter and a bias probe? My amps are a marshall jcm and a dsl if that is any help. There's not much to know if you use a Bias Rite. Maybe it's a bit amateurish to do like this, but it works fine for me. Best info on the theory behind biasing is on Randall Aiken's web-site in the Tech Info section. The DSL has test points and bias adjustment pots on the outside of the chassis so you can adjust the bias without opening the amp up.

However, depending on how old your amp is, I've found it quite a hard amp to adjust the bias on due to interaction between the adjustment pots. The JCM has a bias adjust pot on the inside so you will need to remove the chassis to adjust the bias, thus potentially exposing yourself to high voltages.

You will also need some form of bias probe to measure the current draw. To measure the plate voltage in either amp you will need a multimeter and have the amp open on the bench and on i. The Weber bias right is a good tool because it allows you to measure both plate voltage and current draw without poking around inside the amp when it is on.

Although it might seem expensive, it's probably less then a couple or 3 trips to a tech. Some extra practical tips: I always leave amps for at least minutes longer is better when biasing them, checking the bias every few minutes or so.

This is especially important in Marshalls which can have a very large time constant in their bias supply, and can take several minutes for the bias supply to reach its final voltage. It also allows the valves to get up to a typical operating temperature.

Also generally if anything bad is going to happen to new valves, then it will happen in the first few minutes of operation. Always have a load attached to the amp this can be disconnected when removing the amp chassis. I also turn down all the controls. If you are going to poke around inside a live amp and I can only recommend this if you are very sure you know what you are doing , make sure that the amp chassis is very stable and don't use both hands inside the chassis "one hand in your pocket".

Thanks for the help guys, It seems alot easier than I thought looking at that weber bias rite website, so I'll get one of them ordered I think. I'll make sure I have a good read of that aiken amps website aswell. Hopefully this should help save me alot of money in the long run.

Does anyone know of a UK website that sells the weber bias rite, as I can't seem to find any? That Compu-bias looks great - instant readouts of plate voltage, current draw and static dissipation. It's quicker than using a DMM - might have to get one of those myself. That one seems to be better than the Weber, has some more fancy stuff to it.

So with the CompuBias, you set bias based on Wattage? The probes look also shorter than on the Weber, which is a bit annoying as they hardly fit in small housings, such as the VHT where I first removed the fan to be able to plug it in, but then got some advise from Steve Fryette about how to do it with a multimeter on the OT connections. Quote from: hunter on August 12, , AM. There already is a resistor in each plate circuit in the form of the output transformer primary resistance.

The resistance is typically around ohms. Normally the voltage reading will be in the range of 1. So for example: 1. Observe all of the usual precautions! OK, that's different from the transformer shunt method. I've actually used this method for some amps in which I can't fit a bias probe. It can work very well, and is obviously cheap assuming you already have a multimeter! However, I would only recommend this method for someone with a more advanced understanding of amps, as not only do you have to correctly identify the OT primary taps, there is a bit more maths involved.

You must ensure your filter caps are discharged fully before you take the resistance reading otherwise you will get a duff reading and you can destroy your multimeter. You can also get some strange resistance reading on some OTs, which I assume is due to their primary inductance.

It involves having the amp on with high voltages exposed though, with corresponding risks, and doesn't allow you to measure the current through individual valves, which is often very useful think SVT. A bias probe is safer for the inexperienced user, however they certainly aren't cheap which is why I made one!!

SMF 2.

oscilloscope.

Eric Sporer. Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. The solid state transistor, upon its invention, replaced the vacuum tube in most applications. Vacuum tubes, however, are still commonly found in guitar amplifiers due to their aurally pleasing non-linear behavior. Vacuum tubes require high voltages to operate properly; low voltage operation leads to extreme… Expand. Save to Library Save.

Aiken Invader 30

Read the current issue of VG. Randall Aiken makes his home in Buford, Georgia, and for many years has been repairing and designing amps. A double-degree holding electrical engineer who put himself through college by fixing and modifying guitar amps and playing guitar in bar bands, Aiken is quite familiar with the vagaries of guitar tone. His current line includes three amps, with several others in the works. Rear-panel pin jacks facilitate tube biasing without removing the chassis, using a rear-panel bias pot. Tube sockets for preamps are shielded Belton glass-fiber-filled PPS, with wrap-around pins for reliability. The Invader also has a built-in power attenuator that lets you crank the preamp and power tubes as high as you wish, setting the master volume to an appropriate level for stage, studio, bedroom, etc. The reverb feature of this amp is, um… swell! A depth and swell control permits users to decide how much reverb they want and, how fast or slow the reverb tails off.

The Alteration of Resistance, Inductance and Capacity by Means of Resistance Coupled Amplifiers

Enter info in blue and click any 'Calculate' button. Select Tube Type: 6J7 0. Enter Cathode Resistor: ohms Cathode resistor ohm value. Use this calculator when you measure the actual plate current.

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Cathode bias

Tube amplifiers are a great piece of old-time technology that have managed to stay relevant through the ages. One of the advantages of using them is the fact that you can tweak them to a great degree. For example, you can do tube rolling , which is the practice of individually personalizing each tube in the amp so that it performs to your personal taste. One of the more interesting tweaks that people can do is to add a tube amplifier choke. These are usually iron core filters. They look like small transformers to the untrained eye, but they just have two leads leaving the housing. Their main job is block AC voltage coming through, while letting DC current to pass.

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Username: Password:. Author Topic: Biasing Amps Read times. TomW Featherweight Posts: Does anyone here know of any decent books on biasing amps, as I have decided I want to learn how to bias my amps myself to save me from having to take them to an amp tech every time the valves need changing?

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Embed Size px x x x x Contents Getting Started This revolutionary biasing meter was the first of its kind to give a digital readout of the actual power dissipated in the output tubes.