GENERAL DESCRIPTION. The A Amplifier is a rack mounted, AC operated power amplifier intended for use in sound reinforcing, paging, music distribution. Hi there, up for sale is a Vintage Altec A Tube Amplifier. It is in EXCELLENT condition and sounds fantastic and works as it should. This would be perfect. i’ve read mixed reviews on these online. some say they arent all that special and basically PA amps. i saw some stuff that claims they are good.

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To open downloaded files you need acrobat reader or similar pdf reader program. With this, however, I wouldn’t go beyond about 1 watt output keep your multimeter, set to an AC range, across the dummy load to monitor the voltage- keep it to 2.

You certainly won’t hurt anything by running the tubes at a lower plate current. These Altec amps were used in the finest movie theatres for multi-channel reproduction of Cinemascope magnetic soundtracks.

Log in or Sign up. Posted September 18, Also some files are djvu so you need djvu viewer to open them. Compare that to the appearance of the input signal from your generator.

You can write in English language into the forum not only in Hungarian! That said, they sound good as they are. 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 aaltec them with no load. Of course, don’t leave it running like that for too long. You would then need to measure the transformer impedance easy to do with your signal alec to see which 1568q the closest match.

Through Altec Voice of the Theatre speakers, of course. Looking for other manual? Already have an account?

Vintage Altec Lansing A Mono Block Tube Amplifier | eBay

Again, check out the online articles on altecc it’s much easier to explain with pix than in words. Share this post Link to post Share on other sites. 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.


But, in any event, 1568w can connect your 8 or 4 ohm resistive load assuming it’s rated for the power needed and look at the sine wave appearance at the point just before the onset of visible clipping a flattening of either the top or bottom rounded portion of the waveform. There are some nice articles online which show how to interpret deviations in the waveform appearance and form some correlation with distortion. The amps I have were set at very close to volts bias and operate fine aotec this setting and sound absolutely astounding.

Yes, my password is: The chances are, even if it algec increase the distortion a bit, you may not even notice a difference when playing music.

Post or PM if I can help any further. Your name or email address: In any event, you certainly have a good handle on what’s needed here to answer the bias question. It’s been my “bible” for longer than I can remember. To sum it up: As a matter of fact Wltec 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 However, one can make some circuit changes in the interest 156a8 better sound.

Most users of tube equipment, unless they’re really into the technical side, never check 15668a bias algec. If you are not familiar with electronics, do not attempt to repair! By chance, is your ‘scope a dual trace type with which you can superimpose the waveforms? No, create an account now. Good luck to the repair!

Az erosito reszet elegge macera szetszedni egyszer korabban mar nekiestemugyhogy ezert merult fel a kerdes, hogy a fentiek alapjan erdemes-e vele me’g tokoreszni, vagy kuka. You could suffer a fatal electrical shock! Any comments would greatly be appreciated. A guy named Tom Tutay does mods for them. If you have, or can borrow, a copy of the Radiotron Designer’s Handbook it will give 1568s everything you need to graph virtually anything. I assume doing this with a dummy load I also have at or near the maximum rated output level of 40 watts at say 1kHz would probably be a good place to start?


Just off the shoulder of Orion.

Used altec a for Sale |

I agree with the low signal when feeding the input square waves as I wouldn’t want to fry the trannies or pwr sply. It certainly is possible that they decided, at a later date, to run the tubes cooler to increase longevity. The difference in bias voltage between the 2 schematics remains a mystery. Tubes are all NOS and barely broken in with maybe 50 hours on them.

They were intended for use in churches, bowling alleys, shopping malls, dance halls, high school auditoriums and, naturally, movie theaters. I understand that if I were to run the bias voltage to volts it would lower the plate current but what effect on sound quality and output capacity would result in this change is a mystery to me.

The power supply is good, but could use a choke and good caps. Do you think they later changed the original bias spec of vdc to in an attempt to make the amp more bullet-proof and have longer tube life, or do you think they first chose volts and then they felt the plate current just needed to be higher 168a better operation and sound quality so they revised it to volts?

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ALTEC 1568A Mono-block Tube Amps Stu Remington rebuild [Expired]

Register a new account. You need to be a member in order to leave a comment. These amps were designed to be “bullet proof” and idiot proof. So, I hope this helps you a little bit.