Reading
Room
Thermionic
Audio Books
Last Edited:
12-Sep-2004
| |
| TYPE |
IMAGE
(Click to see full-size) |
CONFIGURATION, RMS RATING |
YEARS (APPROX.) |
COST NEW |
COMMENTS,
TUBES
(tech notes) |
| 331(A) |
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|
AM/FM-Mono
"Simulcast
Stereo"
Tuner
with Mono Preamp |
1957-1958 |
$250 |
Also See AM/FM Tuners
Similar to Type 330(A) but with addition of
two 12AX7's used in monophonic preamp section accommodating: Phono (Mag 1/2); Tape and TV (mono)
inputs;
Concentric Bass and Treble tone controls, Loudness compensator, early versions had
"red plastic dial pointers," featured I/O-"loop"
jacks for optional outboard noise (DNS) processor
used wide "C" Case/chassis
Tubes:
| AM Section |
FM Section |
| 6BA6 |
6BS8 |
| 6BE6 |
6U8 |
| 6AU6 |
6AU6 (3) |
| 6AL5 |
12AU7 |
| 12AU7 |
|
| (2) 12AX7
(preamp) |
6X5GT
(Rectifier) |
|
| 331-B |
|
AM/FM-Mono
"Simulcast
Stereo"
Tuner
with Mono Preamp |
1958-1959 |
$260 |
see above, "C" chassis,
5X4 Rectifier |
| 331-C |
 |
AM/FM-Mono
"Simulcast
Stereo"
Tuner
with Mono Preamp |
1959-1960 |
$265 |
see above, "C" chassis |
| 340(A) |
 |
FM-MPX-Stereo
Receiver, (Stereo);
27-wpc |
1962-1963 |
$379 |
The Type 340(A) represented Scott's evolution of the 355/208 tuner/preamp
(below) into a full receiver. It also replaced the 399.
The 340(A) did give up AM, but in exchange the audio purist got more
power, in an space-efficient package.
The 340 combines a 7591-based amplifier (299-C) section and the FM-MPX
Stereo tuner (350B) section on the tall "G" chassis
A conventional tuning strength meter and "Sonic Monitor" from
the 350B tuner were used.
20 Tubes:
12-tube, Amplifier section:
(4) 12AX7 - preamps
(2) 6U8/6GH8
(Split-load phase inverters)
(4) 7591 outputs
(2) 5AR4/GZ34
5-tube, FM Tuner section:
(1) 6BS8/6BQ7 - FM RF amp
(1) 6U8A FM mixer
(3) 6AU6
3-tube, FM
MPX section:
(1) 6BL8 - MPX
(2) 12AU7 - MPX
|
| 340-B |
 |
FM-MPX-Stereo
Receiver, (Stereo):
30-wpc |
1963-1964 |
$399 |
The 340-B came on the scene a little more than 15 months after the
original 340(A)'s introduction.
It's easy to confuse the 340-B with its Slide-rule dial with later
solid-state models. But the "B" featured many improvements,
which apparently justified a $20 increase.
All 340-B's have solid-state power supplies, headphone outputs,
input indicators, speaker switching, and the new Auto-Sensor stereo
switching (6KE8) MPX
section
18 Tubes:
10-tube, Amplifier section:
(4) 12AX7 - preamps
(2) 6U8/6GH8
(Split-load phase inverters)
(4) 7591 outputs
5-tube, FM Tuner section:
(1) 6BS8/6BQ7 - FM RF amp
(1) 6U8 FM mixer
(2) 6AU6
(1) 6HS6
3-tube, FM
MPX section:
(1) 12AT7
(1) 6KE8
(1) 12AX7
|
| 345 |
|
FM-MPX (Stereo)
Receiver, (Stereo):
29-wpc |
1964-1965 |
$365 |
Final (fairly rare) Scott Tube Receiver design;
Very similar styling as the 340-B, but look closely as the
controls are laid out differently.
The 345 combined a 7591 amplifier section
with a tuner section borrowed from the 350-D tuner.
(Also see similar Type 380 AM/FM-MPX receiver, below)
The 345 introduced several new "Space-Age" innovations:
Compactron Tubes (3):
6M11 (multiplex decoder)
Cool "retro" 6HU6/EM87
"Magic-eye" tube
rather than tuning meter
Used 6D10 (2) phase-splitters and featured individual bias controls for each output
channel
(only Scott 7591 receiver to do so).
The 345's have solid-state power supplies, headphone outputs,
no input indicators, speaker switching, and Auto-Sensor stereo
switching (6KE8). Only Scott receiver to use
"sidewinder" tuner
(tuning gang shaft oriented 90 degrees from facia).
The balance control was replaced by a split-concentric dual volume
control. "Extruded Panel" styling,
slide-rule dial tuning. on tall "G" chassis
16 tubes:
Amplifier section:
(3) 12AX7-preamps, V1/101,V2
(2) 6D10 - splitters, V3/103
(4) 7591 outputs, V4/104, V5/105
Tuner section:(1) 6BS8 -
V6
(2) 6U8 - V7, V10
(2) 6EJ7 - V8, V9
(1) 6M11 - V11
(1) 6HU6/EM87 - tuning-eye V12
|
| 355 |
 |
AM/FM-MPX-Stereo
Control Center
(Stereo
Tuner-Preamp);
designed for piggy-back mounting to the
Type 208
basic power amp
(36-wpc) |
1961-1964 |
$335 (355)
plus
$130 (208)
$465
(for both) |
The 355 was introduced as a more versatile replacement
for the older 399; as such, it was the only Stereo Preamp-Tuner product
ever produced by Scott.
As a Tuner/Preamp (similar to the older 331-series) the 355 had no basic power
amplifier section like the 399 Receiver. Instead the 355 provided a cathode follower,
line-level, preamp out --
Just add the basic power amp of your choice, usually a Scott Type
208, but Mac's and Dyna's were also popular choices.
The 355 added true FM-MPX stereo reception utilizing the 350/335 decoder
design, incorporating the "Stereo Guide,"
6AV6 tube indicator.
As
"Simulcast
Stereo" was becoming obsolete, the 355 was the only Scott AM/FM
tuner to share a (very rare) common circular tuning dial. Scott engineers
cleverly resurrected the 300/320 tuning gang, but thankfully left the more
complex dial-cord string and slide-rule dial inventory untouched.
To accommodate a matching power amp;
Scott offered the optional, 208 Power Amp;
a modular piggy-back, design derived from the 7591-based 299-C amp.
All audio connections, accessory AC, and antenna jacks were top-mounted on the shortened
chassis, to facilitate the matching 208 "piggy-back" package.
18 tubes:
6-tube, Pre-Amplifier section:
(4) 12AX7 - preamps
(1) 12AU7 - cathode follower
(1) 6CA4 rectifier
5-tube, FM Tuner section:
(1) 6BS8/6BQ7 - FM RF amp
(1) 6U8A FM mixer
(3) 6AU6 (shared w/AM)
5-tube, MPX section
(1) 6AV6 (6GX8) ("Stereo Guide")
(1) 6BL8 - MPX
(2) 12AU7 - MPX
(1) 12AT7 - MPX
2-tube, AM Tuner section:
(1) 6BA6 AM RF Amp
(1) 6BE6
|
| 380 |
 |
AM/FM-MPX-Stereo
Receiver (Stereo);
32-wpc |
1963-1965 |
$475 |
Most expensive,
Next-to-last (also fairly rare)
Scott Tube Receiver design;
Once again Scott engineers creatively married past designs:
This time Scott engineers combined:
the 320/355 AM/FM tuning gang,
with the 340-B's Auto-Sensor switching MPX
section,
with a 7591-based amplifier section.
The 380 can also be identified by:
headphone outputs,
input indicators (like the 340-B),
speaker switching, and Auto-Sensor FM-stereo
switching
"Extruded Panel" styling,
AM/FM slide-rule dial tuning,
traditional tuning meter
solid state power supplies,
all on the tall "G" chassis.
It is easily confused with the (FM-only) 340-B.
Note: two different multiplex section designs were produced;
S/N 234531 and below used ZMX-6, 4-tube, MPX sections)
21 or 22 tubes
(depending on MPX design):
Amp section:
(4) 12AX7 - preamp - V1/101, V2/102
(2) 6U8/6GH8 - splitters, V3/103
(4) 7591 outputs, V4/104, V5/105
Tuner section:(1) 6BS8/6BQ7 - fm tuner - V401
(1) 6BA6 - am tuner - V402
(1) 6BE6 - am tuner - V403
(1) 6U8 - fm tuner - V404
(2) 6HS6 - V6, V8
(1) 6AU6 - V7
(1) 6AV6 - V9
MPX section (3-tube, design):(1) 12AT7 - V501
(1) 6KE8 - V502
(1) 12AX7 - V503
or
MPX section (4-tube, Z-MX-6 units, S/N 234531
and below):(1) 6BL8 - V501
(1) 12AU7 -
V502
(1) 12AU7 - V503
(1) 12AU7 - V504
|
| 399 |
 |
AM/FM-Mono
"Simulcast
Stereo"
Tuner
combined with
(Stereo) amp;
18-wpc |
1960-1962 |
$399 |
The 399 was Scott's first receiver to incorporate a complete
amplifier.
Once again, the type number was curiously the same as the price,
just like the original Type 99!
Combines a 7189-based (299-B) complete stereo amp and
a 330-D
AM/FM-mono tuner,
on one tall "G" chassis,
Uses two (AM & FM); "Magic-eye" 6BR5/EM80 signal-strength
indicator tubes.
23 tubes:
11-tube, Amplifier section:
(4) 12AX7 - preamps
(2) 6U8/6GH8
(floating paraphase inverter w/AC balance pots)
(4) 7189 outputs
(1) 5AR4/GZ34
rectifier
6-tube, FM Tuner (311-design) section:
(1) 6BS8/6BQ7
(1) 6U8
(3) 6AU6
(1) 6BR5/EM80 FM tuning eye
6-tube, AM Tuner section:
(1) 6BA6
(1) 6BE6
(2) 6HS6
(1) 6BR5/EM80 AM tuning eye
(1) 12AU7
37 lbs.
|
For a detailed
technical Tuner description see: John Byrns's History of H.H. Scott
Tuners.
For a detailed
technical Amplifier description see: John Byrns's H.H. Scott Amplifier
Specifications.
Note: Scott (Vacuum Tube) Receivers were never offered in Kit
Format.
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