| With
production starting in
1959, by the late 1960s
hundreds of thousands of Dynaco
Stereo
70 power amplifiers
were in use world-wide,
more than any
other
stereo power amplifier.
And in the 1990s, about 25
years after their
heyday,
there were still many
thousands in use
internationally. |
| In
the early 1990s there was
a resurgence of interest
in "vacuum tube
audio"
as evidenced by the
growing number of newly
designed vacuum tube based
audio products appearing
in trade magazines and
showing up at trade
shows
around the world. |
| In
1991 the Dynaco company
had been purchased by the
Panor Corporation of
Hauppauge New York, and in
1993 the Stereo 70 design
was updated,
becoming
the new Stereo 80 (vacuum
tube version). |
|
The
Dynaco Stereo 70
Vacuum
Tube Amplifier
|
|
|
| The
original Stereo 70
amplifier used EL34 output
tubes and put out about
35
watts per channel. The
updated vacuum tube
version Stereo 80 also
used
EL34 output tubes,
supplying about 40 watts
per channel. |
| Additionally,
shortly after the release
of the updated vacuum tube
Stereo 80, there
became
available the Stereo 160
power amplifier, which
used 6550 type output
tubes,
supplying about 75 watts
per channel. It was,
however, built on the
exact
same size chassis as the
vacuum tube Stereo 80, and
so looked very
similar
to it. |
| The
magazine ad from 1994
(below) introduces the
modernized vacuum tube
Dynaco
Stereo 80 - and the
upgrade to the PAS-3
preamplifier, the
modernized
PAS-4
vacuum tube preamplifier. |
|
Note:
There also existed
the Dynaco
Stereo
80 Solid State Power
Amplifier
|
|
| The
task of updating the circuitry for the
vacuum tube Stereo 80, Stereo
160,
and PAS-4 was accomplished by John Nunes
in San Jose, California. The
PC
board designs were done by Arn Roatcap in
Sunnyvale, California. The
factory
assembly of these three products was done
for Dynaco by TIBI
Electronics
in Los Angeles. |
-
|
