ALTEC 1568A PDF

Dutaxe To open downloaded files you need acrobat reader or similar pdf reader program. Do you already have an account? PhototoneAug 2, Good luck to the repair! Log in or Sign up. Post or PM if I can help any further.

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Mikasho Also some files are djvu so you need djvu viewer to open them. Looking for alted manual? The basic circuit topology is very similar to a standard Williamson, so as a first draft you could try converting it to straight Williamson.

The difference in bias voltage between the 2 schematics remains a mystery. I have lived and breathed tubes for the past 50 years and still sltec at the amazing things that they can do! Is this a good assumption? And if the amp continues to sound great, they would never think to bring it in to a service tech I have a friend who has used his Audio Research stuff for 20 years and has never had it looked at- he says it sounds just fine.

It would have been helpful if they printed a serial range for each one, and even more helpful if they specified the plate voltages of the el34s. Posted September 18, One thing I have noticed is there are two versions of factory released schematics running around the web that appear to be identical except for one has a volt bias level and the other has a volt bias level.

Both appear to be unaltered printings on Altec released manuals and other than this one change they appear identical. Vintage Altec Lansing A Mono Block Tube Amplifier The chances are, even if it does increase the distortion a bit, you may not even notice a difference when playing music.

Tubes are all NOS and barely broken in with maybe 50 hours on them. Fanatic, I do have a scope I could look at the change with. Also, in case you are not familiar with it, check zltec www.

A guy named Tom Tutay does mods for them. Altec A Amplifier These Altec amps were used in the finest movie theatres for multi-channel reproduction of Cinemascope magnetic soundtracks. Considering that tube characteristics can change quite a bit as they age, a 7 volt bias variation could occur with normal use over time. Your name or email address: However, one can make some circuit changes in the interest of better sound.

I do have a scope I could look at the change with. There are some nice articles aktec which show how to interpret deviations in the waveform appearance and form some correlation with distortion. Share This Page Tweet. The amps I have were set at very close to volts bias and operate fine at this setting and sound absolutely astounding.

Just off the shoulder of Orion. In most amps, the latec will not be symmetrical. Log in or Sign up. As a matter of fact I do have a dual trace rather slow at 15Mhz but not a problem for audio stuff scope, also have two 8 ohm watt Dale power resistors, signal generator for both sine and square, variac, Audio Control SA RTA, various Fluke multi-meters Sign in Already have an account?

Your last name alhec definitely a credit to your interest in the subject!!! I recently purchased a pair of Altec A EL34 based mono tube amps. Related Posts.

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Altec Lansing Diagrams, Schematics, Service Manuals

Mikasho Also some files are djvu so you need djvu viewer to open them. Looking for alted manual? The basic circuit topology is very similar to a standard Williamson, so as a first draft you could try converting it to straight Williamson. The difference in bias voltage between the 2 schematics remains a mystery. I have lived and breathed tubes for the past 50 years and still sltec at the amazing things that they can do! Is this a good assumption?

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Altec Tube Power Amplifier Model #1568A

They were intended for use in churches, bowling alleys, shopping malls, dance halls, high school auditoriums and, naturally, movie theaters. Good luck to the repair! The amps I have were set at very close to volts bias and operate fine at this setting and sound absolutely astounding. To open downloaded files you need acrobat reader or similar pdf reader program. Do you already have an account? The difference in bias voltage between the 2 schematics remains a mystery.

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Altec 1569A Tube Amplifiers---Stereo Pair---Restored---One Year Warranty

Cape Cod These amps were designed to be "bullet proof" and idiot proof. They were intended for use in churches, bowling alleys, shopping malls, dance halls, high school auditoriums and, naturally, movie theaters. As such, they are designed with certain technical features that would make them immune to most of the common mistakes a non technical operator might make such as running them with no load. That said, they sound good as they are. However, one can make some circuit changes in the interest of better sound. The amps are large enough and easy enough to work on that you can do almost anything you want with respect to refining the circuit for your own use. The power supply is good, but could use a choke and good caps.

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