Mid 1960's AMD Tube Stereo Amplifier
Intended for home stereo use. I picked this bad boy up off an older hippie type guy in simi-working condition. Had to make a new chassis cover out of per sheet metal (old one missing) new knobs, and new 1 meg ohm (log) volume pots. Sounds like a champ!
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First looks
...
Just after cover fab
Lit up
is this the power of zen?
Steam actually.
Cool find user. Is this really the same Advanced Micro Devices that's making ICs nowadays? I know I found an Intel branded vacuum tube once but that turned out to be from a different company, not related to the Intel we know today.
What temps does it get?
It came with 2 Curtis Mathis output tubes that likely came out of an old Consol TV
The basic electric circuit is the same as IC's. although, an equivalent integrated circuit would be about the size of a toe nail, and wouldn't weigh 13 pounds.
AyyMD housefires
500W TDP Amplifier LMAO
Looks nice m8. Personally I would gut it and add new internals.
>not Thorens
Lets just say, when its warmed up, you can fry an egg on it.
>AMD tube amplifier
that's it, AMD is really fucking finished. Finally.
Planning on getting NOS RCA tubes for it, and doing a full re-cap. The difficult thing on some of these old pieces of tech (including radios/amps/TVs) is the filter caps are simi-modular (can caps) where 2 or more caps where housed inside of a single can. The problem being that they don't make new replacement cans with proper values. So you have to get all of the values off of the can, figure out where they tie in via schematic (which is difficult/impossible to get sometimes) and find a place to put them in the chassis. Lucky for me, the filter can on this one is a 40+40 uf. So the two caps are about the same size as the can, and all ill have to do is figure out which connection is ground, which should be soldered to the chassis.
>Is this really the same Advanced Micro Devices that's making ICs nowadays
No, it can't be. That one was founded in 1969. Tubes were going out for most things by then.
They were replaced by transistor technology, but the principle electoral proses of signal amplification is the same.
I'd love to have one of those to drive my desktop speakers.
*electrical
Also what does it have for output tubes?
This would do it. They make new table top tube amps with solid state rectifiers that are relatively inexpensive, but i would recommend driving some decent passive bookshelf speakers.
Currently it has 2 curtis mathis EL84's (japan) looking to replace them with a matched pare of NOS RCA black plates (1958-62ish) or possibly grey plates (1962-on). American tubes FTW.
That is, RCA EL84's of course.
What are these new amps you speak of? I haven't seen much in the way of inexpensive new tube amps outside of the headphone realm.
So only one for each channel? Nice single-ended pentode...
I have a radio with an ECL86 for each channel which are almost just ECC83 and EL84 tubes put together. One of these days I might try using it to drive my desktop speakers.
They are a Chinese import, branded 'Nobsound' they can be found on Ebay. This amp only runs 5 watts per channel, but im running it through a pair of Kenwood KL-4080's (pictured above) i picked them up in a similar fashion for cheap. They have a max wattage of 40W, and a db sensitivity of 101, so they are incredibly efficient, which is crucial for tube amps being as they tend to run at low wattage. The general rule for db sensitivity is anything less than 90 db is a no go for tube amps. High sensitivity speakers can get pricy on the new product market, so its always good to try and find vintage, simply because they are cheap, and at one point in time (pre 1970 or so) most if not ALL speakers were high sensitivity, because most if not ALL amps were tube.
With the speakers im running, this thing gets pretty loud, especially the Chromecast. If it gets loud enough to piss your spouse off, than thats all you really need. Believe me, it does a fine job at that.
I would imagine that radio should dive your speakers no problem, and if it sounds good to you than thats all that counts!
>Sup Forums
>spouse
I'll check out the Nobosounds, although I'd much rather have something non-Chinese. My radio definitely has plenty of power for my desktop speakers (a few watts per channel will suffice) but it has a background hum and I think one of the channels might be slightly muffled, so it might not be suitable without restoration.
Neat, I hope it works out
looks good OP
Yeah, probably needs a re-cap. Lots of fun to do if you like soldering irons! Anything affordable will probably be Chinese, but I've only heard good things about these little bad boys. And for less than $200, its worth the 'made in china' stigma in my book.
This one is a hybrid and I'm definitely looking for 100% tube. Seems like they make some but they're quite a bit more expensive. For a few hundred bucks I might be able to get something USA-made in good shape.
This thing scares the hell out of me. I think I need to start with a more barebones amplifier.
It is a hybrid that is true.
Yeah, that thing is heavily integrated... its sick as tits though! Best of luck to you!
