altec/peerless mystery amp

[gja]

Hi everyone,
I need some help with a tube amp I have.It has no make exept for the transformer which is a peerless /altec lancing corp seriel 16277.It has 2 12ax7,one 12au7,one vr150 written in chassis plus two tube sockets.I got it with the following tubes 2 x 12ax7,1 x 12au7,1 x od3,2 x 6l6g.It has a 8 pin plug for the psu.I would like to find the schematics for this but do not know exactly what it is.power amp?preamp?one black rca plug and 4 red pin plugs.screws for impedance unmarked.
any help welcome.It has a screw for balance aswell.
Thanks

 

[Gluca]

Have a look to this link

http://www.triodeel.com/schindex.htm

There is quite a number of altec/perleess schematics. Hope you find something useful. It should be a power amp. mono.

Ciao
Gianluca

 

[gja]

thanks for the link.unfortunatly haven´t found what I´m looking for.Cheked again inside the chassis but nothing written there either.
Any more help anyone?
Thanks

 

[kevinkr]

I think it is pretty obvious looking at it that this amplifier was a DIY effort and not the product of some audio company. Looks nicely built though, too bad you have not got the supply that goes with it. The chassis box appears to be a bud box incidentally. I have seen a lot of home brew amplifiers in this neck of the woods over the years and some of them were built to very high standards.

Kevin

 

[tomtt]

please post some pics of the insides

thanks

 

[kmtang]

Seems like a tube regulated power supply to me.

Johnny

 

[kmtang]

Seems like a tube regulated power supply to me.

Johnny

 

[gja]

thanks everyone.I´ll post pictures of the inside and more details asap.keep checking.

 

[kevinkr]

I don't believe it is a power supply, as I recall I used the same type of peerless output transformer in one of my long ago projects. The OD3 could be used for screen regulation if the amplifier is set up for tetrode mode operation. The driver topology is anyone's guess..

Kevin

 

[Frank Berry]

What is on the other end of the black cable which appears to be coming out of the chassis?

This looks like a monoblock amplifier. At first guess, I'd say that the black cable goes to an external power supply.

Please furnish photos of the underside.

 

[Gluca]

LOL! Are we going to win any prize in case we guess right???

😀

Gianluca

 

[gja]

Promise to post more pictures this weekend...I´ll think about the winning prize...
cheers

 

[gja]

pictures at last

crappy pictures of the amp...notice the spelling on the label: "altec lanCing ..."the label does not look fake.
gja

 

[gja]

bottom view

inside the chassis

 

[gja]

top view

with the tubes removed.one rca,several banana style plugs.

 

[Bandersnatch]

Here is your answer

That is the amplifier section of a Heath W2. It needs a power supply, but you have the good part, the 10k a-a Peerless OPTx.
cheers,
Dogulas

 

[Gluca]

Indeed. I saw a couple of these trannies on e-bay last week ... precious.

Gianluca

 

[gja]

thanks

Well thanks for the info.I´ll see if I can find the schematics and psu (or make one).
Thanks again everyone

 

[kevinkr]

The output transformer may have been used in a W-2, but the only Heathkit W-2 I am aware of used a pair of 6SN7 and 5881 in an ultra-linear implementation of the old williamson design. This particular amplifier is not a W-2! The power supply which was on a separate chassis used a 5V4.

Here is a link to schematics, and pictures of a real W-2: http://www.vintage-radio.info/heathkit/

Another thing that makes it obvious that this is a homebrew is the raggedness of the holes around the tube sockets. I have never seen a heath product available commercially with holes that looked like that.

I maintain that this is a homebrew, albeit a very well put together one.
It may even be a williamson, but the tube line up makes me believe otherwise.

Best, Kevin

 

[kevinkr]

I had intended to post a picture, but I don't have anything good enough, (and I don't currently own a W2) however there is a very lousy one you can look at here:

http://www.vintage-radio.info/heathkit/diagrams/w2_spec.gif

Kevin