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.
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Akinorisar Do you already have an account? And if the amp continues to sound great, altdc 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. I do have a scope I could look at the change with. Already have an account? That said, they sound good as they are. Post or PM if I can help any alttec. They work excellent and I plan on keeping them all original as they just have too much vintage appeal to change them.
Please, do not make a copy of the downloaded manual and do not offer to sell it, just use personally to repair defective appliance! Also some files are djvu so you need djvu viewer to open s.
Sign in Already have a account? No, create an account now. The difference in bias voltage between the 2 schematics remains a mystery. It certainly is possible that they decided, at a later date, to run the tubes cooler to increase a. 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 altev you think they first chose volts and then they felt the plate current just needed to be higher for better operation and sound quality so they revised it to volts?
To sum it up: The amps I have were set at very close to volts bias and operate fine at this setting and sound absolutely astounding. These Altec amps were used in the finest movie theatres for multi-channel reproduction of Cinemascope magnetic soundtracks. In most amps, the clipping will not be symmetrical. If you know someone with a CAD program it sure will save you a bunch of time.
This file is downloadable free of charge: Your name aotec email address: They were intended for use in churches, bowling alleys, shopping malls, dance halls, high school auditoriums and, naturally, movie theaters. Any comments would greatly be appreciated. Looking for other 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. Also, in case you are not familiar with it, check out www. Sign In Sign Up. As a matter of fact I do have a dual trace rather slow at 15Mhz but not a problem for audio stuff alec, 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 Compare that to the appearance of the input signal from your generator.
You need to be a member in order to leave a comment. PhototoneAug 2, You can write in English language into q forum not only in Hungarian! My basic knowledge tells me that if the amp performs well, output tubes arent running at too high a plate current and the amp sounds great at the higher vdc bias plate current, go with that. You could suffer a fatal electrical shock! Sziasztok, MX gyel van valakinek tapasztalata? Please post your results after doing the experimentation. But, if all is well with the volt aa, why mess with it?
altec 1568a, hifi or PA amp?
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.
Altec Tube Power Amplifier Model #1568A
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. Considering x tube characteristics can change quite a bit as they age, a 7 volt bias variation could occur with normal use over time.