I am looking for 5 x Peerless Line Transformers # 15095 for the Altec
352A Mixer/Amp
OR a good substitute, if possible. Any recommendations?

Thanks in advance
Karin

Karin.Brit wrote:
I am looking for 5 x Peerless Line Transformers # 15095 for the Altec
352A Mixer/Amp
OR a good substitute, if possible. Any recommendations?

As I recall, those are step-up transformers but you can use a 1:1
transformer and still have plenty of gain.

One suggestion would be to get the 600:600 transformers in the
octal cans from Sescom. You'll need to unsolder the leads inside
and change the pinout to match the Peerless, and you'll need to
install a 600 ohm termination resistor inside, but it'll sound a
whole lot better than the original Altec and still have plenty of
gain.

You could also buy octal plugs from Newark Electronics and mount
some 1:4 Lundahls on them. I think that would give you about the
same ratio as the original Altecs, and again it will sound much
better than the originals. Won't look as nice as the Sescoms.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Scott Dorsey wrote:
Karin.Brit wrote:
I am looking for 5 x Peerless Line Transformers # 15095 for the Altec
352A Mixer/Amp
OR a good substitute, if possible. Any recommendations?

As I recall, those are step-up transformers but you can use a 1:1
transformer and still have plenty of gain.

One suggestion would be to get the 600:600 transformers in the
octal cans from Sescom. You'll need to unsolder the leads inside
and change the pinout to match the Peerless, and you'll need to
install a 600 ohm termination resistor inside, but it'll sound a
whole lot better than the original Altec and still have plenty of
gain.

You could also buy octal plugs from Newark Electronics and mount
some 1:4 Lundahls on them. I think that would give you about the
same ratio as the original Altecs, and again it will sound much
better than the originals. Won't look as nice as the Sescoms.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

Hi Scott, Just curiousity. What's the difference between the original
Peerless 15095 and the Sescom octals?
IIRC the 15095 were a split 150/600 to 15K depending on the pin
strapping on the 352A. I'd have to dig out the Altec lit. to confirm
it.
I haven't tweaked on one for 15 years so memory is not too fresh.
I have a couple in storage holding a shelf down :-)
Please don't flame me just for being a fan of the Green face.
They got the job done, and I had very few failures that weren't
originated by operator error.
You just can't prevent the motivated to screw things around,
no matter how thick the door is.
TLGO

wrote:

Hi Scott, Just curiousity. What's the difference between the original
Peerless 15095 and the Sescom octals?

The transformers are different construction with different core materials
and the ratio is different.

IIRC the 15095 were a split 150/600 to 15K depending on the pin
strapping on the 352A. I'd have to dig out the Altec lit. to confirm
it.

That sounds about right. You don't really need the high-Z secondary
winding, though, if you can afford to lose a little gain. And those
Altec mixers have plenty of gain already.

If you use a lower-Z secondary, you need to add a termination resistor
inside the can (since the input is terminated for 15K).

And, of course, it's easier to make a good-sounding low ratio transformer
than a good-sounding high ratio one. Sescom can make a decent 600:600
transformer for thirty bucks... you want a good sounding 600:15K and you
are into spending big money to Lundahl or Jensen.

I haven't tweaked on one for 15 years so memory is not too fresh.
I have a couple in storage holding a shelf down :-)
Please don't flame me just for being a fan of the Green face.
They got the job done, and I had very few failures that weren't
originated by operator error.

I don't think they are bad at all, and I think the real sonic bottleneck
on them is mostly the transformers, which are easily replaced. I have
used those things for a lot of jobs in the past and they were much better
than typical for that era.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."