收藏本站

开盘机音响技术网

 找回密码
 注册加入
查看: 18466|回复: 12
收起左侧

请教小南瓜的几个问题

[复制链接]
发表于 2012-10-12 09:08:45 | 显示全部楼层 |阅读模式

赶快注册并登录访问我们网站,呈现更多精彩内容!

您需要 登录 才可以下载或查看,没有帐号?注册加入

x
6357165  开友问我关于Nagra 4S, 4STC, 4S-JC的技术特点,以及在发烧及专业上的应用等,我觉得还是请教红灯,泡泡,演奏播放等专业或资深烧友,能得到較专业和全面的解答,谢谢.
发表于 2012-10-12 14:13:32 来自手机 | 显示全部楼层
坐在沙发等听课
发表于 2012-10-12 15:57:15 | 显示全部楼层
坐在沙发等听课

) X/ B5 W) @* S  T) n: }4 |0 V0 q我拿个板凳{:4_213:}
发表于 2012-10-12 21:43:10 | 显示全部楼层
作为专业领域的便携式开盘磁带录放机,南瓜4系列是佼佼者,以4.2和4s为典型代表。从我使用、维修过的南瓜机器以及手头上掌握的技术资料来看,4S的几个衍生款式差别不大,没有后缀的机器录音电平旋钮与有后缀的结构不一样:没有后缀的平淡,有后缀的气派好看,其它有啥本质上的差别,我还没发现;录音效果很棒,放音效果与其录音效果相比差距不小。当年它的主要使用场合是电影摄制过程中的室外录音,同步录音技术很成熟,室内很少有使用它的。广播领域有用但不多,由于价格昂贵,被后来的日系SONY的NATIONAL的便携开盘取代。
 楼主| 发表于 2012-10-12 22:33:35 | 显示全部楼层
就是说在4S基础上加入time code技术的4STC并没有质的飞跃,SJ也进步不大.
发表于 2012-10-13 12:13:07 | 显示全部楼层

8 R& Z9 }, s: Y% P0 Wtime code 的加入,使机器具备了time code counter 的功能,便于循迹剪接,这在模拟磁带记录史上就是一个很大的进步,使之在影录音制作领域很受欢迎。人性化、艺术性的设计构思,既是一件实用的工具又是一件完美的艺术品,一直受到人们的热捧。我认为它优质精密的直流主导电机和用人造宝石阻尼伺服系统是其精确控制走速的先进所在,尤其是它那独一无二的表头,夜色里就像美少女的大眼睛,随着音乐在闪动,勾人心魂令人蠢蠢欲动...
发表于 2012-10-13 12:22:30 | 显示全部楼层
4s应该都有时钟码功能,看有没有配置。录音放音磁头中间的就是TC头,下面图片来自于百度搜索有裁剪
+ ?: r' ]8 C: Z8 l7 u 1.png 2.png
; C& E& i0 h: e' X$ E6 a) R$ T5 ~# O
 楼主| 发表于 2012-10-13 18:10:14 | 显示全部楼层
本帖最后由 LeeNY 于 2012-10-13 18:15 编辑 0 F9 r3 j8 b/ X" G/ N6 k
[color=#脚印留下*^_^* ]红灯记 发表于 2012-10-13 12:13 4 G0 V2 M9 o/ N% N: y7 m
time code 的加入,使机器具备了time code counter 的功能,便于循迹剪接,这在模拟磁带记录史上就是一个 ...

5 H8 |9 j% h8 a) a
+ N) W0 K9 K3 i8 y8 F精采!{:4_219:}. V1 z4 x/ D. p; X- U
( I7 j1 U' {: x4 X" k) S
请讲讲SJ3 a! s) F1 T/ ~0 x, F! s% Y1 C
发表于 2012-10-14 03:16:51 | 显示全部楼层

/ M* }* a  M  c0 g1 `6 ?# u
Uher's range of portable audio recorders were for perhaps over 30 years, the reliable 'work horses'
8 R1 O  R' [1 {! Eof the professional radio interviewer. German made and of 'sensible' and real world construction,
9 @2 W3 P# I+ f2 S- |these robust machines cost a fraction of an equivalent Nagra or Stellavox recorder., Y' }: J; @! ]) S

+ r5 \7 J+ c9 L" B+ _/ ?; l1 F) p! r- A- q) \
While the film maker might need Pilot Tone synchronization, 48 Volt 'phantom' condenser: M( ?: Y9 E7 r# d3 ]: O. M. c" ~
microphone powering, or even time code, the hack radio reporter just needed a good quality,
! d' n& q2 T1 x. z& U, kstrong, simple and reliable tape machine with a basic dynamic microphone input. And while there) D( ?8 Y/ h# J7 S. k+ k
were a few alternatives to these machines from the likes of Tanberg, Ficord or even Grundig, the1 L5 w2 L: L7 E0 X) N
Uher Report series became the de facto portable tape recorder standard for radio reporting.
. d3 u2 P4 n9 w, J( c
7 q8 u0 m3 j- E- X$ u. O- {; ]- k/ ]8 k: a( I! g4 I2 k
Actually these machines were not all that cheap, and cost perhaps the equivalent of a serious2 }0 S6 Q  R% a9 I5 ~2 Q! |5 n
domestic 'Hi-Fi' tape-deck of the time. (The Nagras and Stallavoxes were many times this though.)8 x; x5 [8 p* h/ S' \! }# \

' v- j/ i/ F. n! v! _
% I& }' B, T3 ^; D; M1 g
Actually this half track stereo recorder is a later version of the 'genre', and has improved metering
& }: w5 n! h( h- X2 Tand internal electrical switchery. It has four speeds, though for serious work only the highest (7.5% D/ S( y) N8 L: N- t6 j
inches per second) speed should be used. The lower speeds become less and less useful, but; R" w2 p" r/ P0 t( H
speech recording at 3.75 I.P.S. would be perfectly OK for most broadcaster's use. While of
) `3 |% M3 A5 M- m: p( v0 Acomparatively elementary mechanical design, these machines can make surprisingly good4 @3 O3 z' m8 \: g3 O0 {( l- e
recordings at 7.5, seemingly just as good as a Nagra or a Stellavox at this speed. They also record
3 h9 K. p3 g6 o- [+ Xrather well at 3 and 3/4 inches per second, but speed stability and 'wow and flutter' (how arcane in- t8 E; x, X$ n  H  |8 B. h2 e
theses digital days) is nowhere near as good as with the Swiss exotics. Remarkably, one can set the: `4 A1 o8 r0 ~% `2 r
bias up on these machines 'by ear' for indistinguishable record / replay results (yes I know this is& E3 @% e8 r0 W$ u- @) a
cheating), which you cannot do as easily on the Swiss machines, for probably good reasons. As a
6 |$ g. V8 Q/ n% L8 m' Greel to reel audio recorder the only, though fairly significant drawback, is a limited recording time+ l/ y5 W# e2 G8 o- {, n. M* ]
of 20 minutes on the highest speed. Though for radio interviews that would be edited into sound
8 D( }6 A& S8 nbites anyway, this was not a problem.: r' Z( M# l. ?+ }5 m

3 `; R+ W: |0 q9 I; m
6 M( o3 W1 ]. E6 I0 |/ `Over the years Uher made a whole range of semi-professional tape equipment, audio and even Hi-; _# m* {+ T6 d
Fi equipment, much of which for domestic consumption only though. They even made a couple of# i8 o7 S. k7 O/ K" z# A, E4 \; g$ M
versions of a high quality (if there ever was such a thing in the context of serious audio) portable
* y3 F2 V6 d' \0 uCompact Cassette recorder. But while Uher are still involved with dictation equipment, they will
0 N' b; \/ E5 o" d! ]4 G' \. hprobably be remembered in the history books for these robust and reliable portable reel to reel
; T; C5 F4 `1 s# X% L% o3 [machines.+ [2 J$ b: Q* A/ e7 Y

; _* q, f9 j8 O0 x

  Q7 x5 R! K) ?& s# ~
1 y) q( L9 q# B8 o& ^
(The previous owners of the above example of the stereo version have fitted a plastic collar
: k$ O2 e+ G& o- i7 Earound the master level control so that it could only be adjusted by means of a screwdriver - seems5 u- @8 `6 N3 r% m
a sensible idea, so I kept it there.)+ M9 P8 M) K  _! a9 v
- f7 F' o9 P/ |5 f
9 {9 Y* ~) {, i
发表于 2012-10-14 03:18:49 | 显示全部楼层
8 z* J; M7 T2 k
The Nagra IV-S Portable Audio Tape Recorder  e. ?. `( d- A- V

7 d/ b7 e# U8 K  b& D# m
) y* p) ]. M- W3 d5 q  V
& U& V0 R8 ?7 z4 ]9 }
What can one say about what is probably the most successful and long lived portable professional tape* z( l# x# G' x: z6 Q
recorder ever made? Certainly the 'Nagra' was a legend in it's own lifetime, and remains an object lesson in
, L; N; m; n% m+ m3 c9 _quality of engineering together with remarkably simple and unpretentious functionality. Beautifully made and* H' g' f' [/ A( \1 K7 f( C
until just a few years ago just about every film and television programme produced had its sound recorded; v2 I+ b7 z0 j5 ?4 M) [) u) ?
on one of these impeccable machines.5 H; s+ {5 D0 F2 s3 T0 i. r8 [$ s) Z

+ w; L+ T2 I3 N' M# ]0 d& [/ W, z' P& ^8 k. K$ d
Nagra portable film sound recorders similar to the above machine became the de facto industry standard for
# {, f) C) G' pmore than a quarter of a century, and were only gradually edged out of use in the last few years by firstly;
! l8 K- Y4 T1 ^+ X# H; Y" k6 E+ `compact R-DAT recorders, and now by various short-lived and almost disposable file based devices. As
0 D1 k1 w2 m6 }$ P; C+ T( k" Xwith professional video, the new technology seems to be doing anything but establishing any industry
- O( ~6 V: Y& B+ V# {$ T) P4 hcertainly or commonality of format.
/ g7 s- c1 n% g" \! C; a! t1 S  X( y9 o5 e
8 {. O) q: H0 t* B, x, e
The Nagra IV-S shown above is an immaculate late time code machine type NQS-TCC, which might indeed
8 B2 R! y0 S: |" Jbe still available new from the factory, and I wish it was part of my own collection...6 k& }( A! h4 F% C! @+ X+ E* a

+ ~, Q7 ?0 t. o" f
; p! a: \0 e1 \# L! {4 C! Z  qThe June 1989 Audio and Video Product Line catalogue describes it thus:, b' u! n5 u) E+ O% X3 n0 l4 o

2 x. S! W6 F! ^. O5 X4 ~- Z8 t3 U3 G& |! j5 k
'The NAGRA IV-S is a portable self contained 6.35mm (1/4") tape stereo recorder designed for high quality
/ L& M. j  ^) [musical recording, cinema and television applications. It has three speeds: 38, 19 and 9.5 cm/s (15, 7 1/2
. x/ A8 z. G( j% |3 K/ T, H+ Rand 3 3/4 ips) NAB or CCIR, plus NAGRAMASTER (38 cm/s only / 15ips) equalizations. The machine has( M( `$ Q/ q- I1 j
two microphone inputs with three pin XLR connectors, switchable between dynamic, "T" or Phantom1 l, l0 H9 P$ A/ h
powering, with phase check, and left channel phase reverse switch, or two current line inputs. It also features
5 u8 L& q* c, h& h) na NAGRALIN antidistortion system, high pass filters for recording or replay, and a switchable automatic
/ a$ W% B& L8 b* `level control and limiter. Built-in loudspeaker, and headphone output and reference signal generator. The
" F' t5 Y. \2 H) d* b5 {machine can be fitted with a NAGRASYNC F.M. 50/60Hz pilot system or the SMPTE/EBU centre-track2 D4 R, L5 T% N
time code system, including a built-in time code generator, for synchronizing. Other accessories are
' h+ d# f5 C4 F$ Oavailable for particular applications.'
5 s* ^+ ]$ o! E( y( H# ?4 f* k  e! |/ o1 t5 R, ?' Q
! M3 C% U$ y  t; k5 C  \' _/ N
6 k9 `6 [& P& {2 e" d
                               
登录/注册后可看大图
# Q  R6 F% P+ N/ p. D. B4 o5 U. G7 r
Above is the tape head area, moving from left to right we have; the dual-gap ferrite erase head, the time: J( R; F" Z- i9 Y5 E" a
code record/replay head, the audio record head and finally the audio playback head. In this photograph the
0 k. {( b* U3 q  F7 G) `tape path has been opened for lacing and the hinged audio head screening shields are folded down. One  M: r) \+ K; z  P4 E
might like to appreciate the substantial tape guides and the massive stroboscopicaly marked flutter idler
- ~5 m3 h0 }) V3 }. Awheel. Every component looks simple, honest and beautifully engineered. This version of the machine uses
1 i2 N4 ~# F& y& R& Va later type of tape guide which have a slightly textured though very hard white ceramic face plate, together
) c' I, h& e! i4 f8 _( j7 Y% mwith (unique?) ruby rod end stones. Apparently the ceramic face plates replaced solid polished slices of
+ [: b  d: s1 qsynthetic ruby used in the previous version of these guides because it tended to cause a slight stiction or! M5 O. e$ N  @4 D7 [- D
judder effect with the tape which could increase scrape flutter. Visible just in front of the central time code6 ^: U. p( |, @+ O+ ]
record/replay head is the unique Nagra azimuth adjusting device. This consists of a pair of very slightly
2 o6 C7 O7 Z, [8 h* Qwedged disks sandwiched under each record and play head, one was fixed to the deck plate and the other
. {3 r/ z9 ]& Y4 J& f& Khad a geared circumference. To adjust the head azimuth one just turned a small socket headed gear wheel at$ x$ f1 G) D% f& ~% A' a# [. K9 n
the front of the head with an Allen key, and this rotates the two wedges against each other, thus rocking the
1 m( a' d- z+ t% T8 Hhead back and forth. As far as I am aware this system was fitted to all Nagra portables, though can't recall& F) G. U7 J0 r' R
if it was used on the T-Audio.! r$ W8 j3 M4 h6 K. {( X- X/ a. @

+ M1 h! d+ y! |6 |0 c( O' L0 ?

. k" W( A5 P! R) t; L( n

( M2 k$ ]8 x6 X, B* j% }% U9 ]                               
登录/注册后可看大图

; P  j8 \) A% k3 O6 k! x3 P
5 h4 z. t# N2 N8 R" g' @
+ c7 v8 M, o. u  ~8 H

. b% m6 A2 S+ t' |2 Z
Left side of the Nagra IV-S, containing the various noise-reduction and line inputs and outputs, together- k) R! h+ X' T/ i9 X- p. A
with the XLR microphone inputs and their powering mode and attenuator switches. One of the many nice
. \. W4 X9 u9 x0 Z* ~1 ltouches are the slotted carry-strap 'keepers' (extreme left).4 }. w, ?8 M9 X/ F

' g' Y: [. e6 r  H5 w
& N$ Q4 C: }5 b' ^

* v( b: A$ W9 W1 D5 |% i
Right side of the Nagra IV-S showing the loudspeaker grille together with the various power and time code
; `5 E8 D6 D/ ?: O+ l- Qconnections.6 b$ c! f5 t; {' L# b+ f

& }( |, @' @) V
5 o, B2 f3 e7 e$ p

# H5 |0 q5 L  J/ ?8 p
And if you ever wanted to know what the underside of a Nagra IV-S looked like... (The rectangular
0 Q" B+ F, \: V2 d* c3 b; ^door is the simply fastened battery cover, which can, if you don't keep hold of it, just fall on to the8 G( x- ~2 m2 \! T" E2 }
floor.)
' S% |0 R6 G0 q
. e" ]3 D# e$ ^; [# E/ C2 M) U: p: |

9 v3 b  c9 ]  a
发表于 2012-10-14 03:23:01 | 显示全部楼层
The Stellavox was the only true alternative to the Nagra portable audio recorder.
/ r  K  m) `) v) o, D# z& U* {& G

" W) x) B2 j9 S! y. q9 xAlso made in Switzerland and reputedly by some ex-Nagra employees, these machines were more
% s6 C0 m( _" G. {compact, rather better finished and felt perhaps more developed than the Nagra. It was as if Nagra) `2 ]( H0 D' ]- o) N) T
had left their own masterpiece slightly unfinished and that the Stellavox was something of an
8 c/ i* U6 o0 o4 fadvanced refinement. But things are never that simple and in addition to the interesting4 \! `8 D  _/ v0 m* x1 U/ D  f
relationship that existed between these two companies, their products also show quite strongly" d% R2 Q/ e" R$ P4 N' M7 o0 l2 C
differing personalities. As an amateur enthusiast I was inclined to think that the Stellavox was the
' j! f* L+ b' C% Ybest portable reel-to-reel recorder ever made. It certianly was a very expensive and rare beast,. ~" F. ]. }5 e7 w4 c
and when I had the opportunity to acquire one of these Swiss portable recorders, it was a# _4 ^1 z' w: ?: Y7 G: f
Stellavox that I went for. However, I was not going to earn my living with it or try and build a- y2 I+ n2 o1 K% U' f
reputation with one. But I imagine that many professionals did, and having had the chance) a  H! N0 J. M5 N; E% C) X
reciently to re-acqiaint myself with some Nagra machines, I concluded that they were just
3 D) O6 Y; v7 c, A' L& z3 d, cdiffering 'solutions' to a similar set of problems. Unfortunately I did not have the opportunity to
5 }7 _' s2 i+ l6 bcompare their audio quality, but have included their specifications on the site.: u' g5 n- {; B# \  i) b

* B" H9 Y# Z$ k. a
  X& B& r7 v/ [' q$ y* ~An impression might be formed that the smaller and more compact Stellavox recorder seems to3 l/ r2 ?" w: \
contain rather more contradictions in it's make up. I believe that it was not as well accepted in the
- D3 V* s% Z; pfilm industry or as widely known generally (though this could be down to discontinuities of+ ^, U5 Y6 X1 @- j
representation, at least in the UK). but they were used when a highly portable, non sync but high
* g4 ^: j- M2 S8 @# bperformance audio recorder was needed. Like the Nagra, variations of the Stellavox were made# u6 M, u" G, f) P) ]
for multi-channel instrumentation recording, and there were versions for 4 track 'Quadraphonic' as
' ]1 ~: f7 u! f% i! k, d8 lwell as higest quality stereo mastering (this version was known as the 'Stellamaster'). Subject to' {" ?! S( ]! G* {# Q2 O
encouraging though mixed reviews by Hugh Ford in Studio Sound in the early 1970's, to use a
4 p! G! l8 k( C- ^8 i( P# K+ p$ vStellavox was to be rather 'diffrent', which perhaps was also part of their attraction. However on0 d# b# C# ?6 U5 N; Y/ x
these pages are examples of both the Nagra and the Stellavox, so perhaps some own conclusions, U: U% V" v: [3 U/ E# {; B
may be drawn.1 E1 w8 |/ u& V  n  |. @6 S4 H

+ h" l& _- Z. F. x1 J

0 [- j( n" ~7 U4 H2 \5 C1 \
% D0 y8 w$ e. _
                               
登录/注册后可看大图
" V1 S7 S6 y' M
The above picture is my own Stellavox SU8, and this was one of the last models from the
6 v% w3 K4 _: [- O& E: h, h9 u2 Xoriginal Stellavox company, this particular example dates from the mid 1980's. The 'U' stands
! E: I- ^- C, \/ tfor universal, because this version of the recorder came 'loaded' with a full range of modules) {1 n2 w) P% S/ X
and options as follows:3 ^; F2 n( P. A. r

' r6 ^8 H2 O( {& n* N! |- _0 {, j# a1 e
MSP module - switchable mono, stereo, 'snchrotone' and 'neopilot' head assembley
* h% a& ?5 V" C+ t1 y* H2 S' Y. {+ K9 \( o9 s( G$ l
SXQ module - crystal pilot tone generator3 e! c& `9 F4 v* V# ^

( b) S! D- B! `$ U" x# f  FSQS module - in-built synchronizer module and associated front panel controls
* {" T. T- a# N  \; R" c/ S; r2 e- k3 `
SOT option - balanced 600 Ohm input/output transformers and seperate connections.) F5 R+ f2 T7 m' P# l

4 L& ^' ~4 I% y$ z6 Y& Q; SAMC tape counter unit
# E. o+ U4 ^$ m0 D  C+ @' u* g
1 R1 C$ T( ?5 h; n' |3 \* z
$ P  X# g0 ?& A# S( e1 g5 b  j! uThe recorder also has switchable 48V phantom or 'T' microphone powering together with a two
4 ]% ~1 x" q. a& Z* Aposition low frequency microphone filter, peak limiters and three position gain attenuators! q; Y' S, D. `1 S; i& \
(these were fairly standard options I beleive). The microphone gain controls have the optional
! m; q" F. U  ?'ganged' gearing arrangement, and can be mixed with adjustable line inputs. Stellavox also made
1 i" b4 T9 I5 a( A7 ba recorder powered external microphone pre-amplifier (and various other external modules), so. d: X# ]8 h4 Y, b2 b4 m! Q
that one could have a fairly self-contained set of 4 microphone inputs if required. Oh, and the
* V8 r; y- y& W# U  @1 M1 Umoulded plastic reel cover had the machined-satin-chromed 'thingy' fitted, for actuating the slate
2 G4 d% c. z5 @9 H3 xtoggle while the machine is sitting in it's leather case.
) w8 M7 T5 o1 o3 I: ~$ b0 `# j' V3 v5 b% A5 m$ G

0 H) A& ?  r- i) FThe recorder's specifications may be found here.* p2 o+ E4 o* ]7 L: U: o; n

3 i; e% j8 R8 D8 C

6 I& O7 B1 O" |5 C0 b, }+ D3 g
Portable Reel-To-Reel Audio Tape Recorder# L  ~! H7 _/ V6 \. v
1 `; e* T+ x3 ]& F; J
5 s% }% W1 q& ]/ I5 t$ z4 a
* r+ w2 u7 b  s( J6 O
                               
登录/注册后可看大图

1 r' h7 i/ }/ p3 z7 s, ?! I# A5 _4 S
The father of the Stellavox, Mr Georges Quellet himself was kind enough to send me this image of
, W; ^, y: ~8 ]. Ohis earilier SM5 recorder*.
7 q0 y0 H) h$ D! c, r3 l
% h4 J9 e1 n1 M* j2 `- l$ v. G8 y
1 a" ]' w! k/ RIt would seem that in 1950's in addition to those in America and Britian, a number of people in/ B$ @+ p9 e8 i
Switzerland were also developing high quality reel-to-reel magnetic tape recorders. Whereas Mr
4 R9 G. H! H& a; ^+ a3 kStuder would go on to produce his superb professional full size machines, Stephan Kudelski and5 h' c8 d/ ]0 e) C# v
Georges Quellet made far more 'pocketable' tape recorders. As a school boy I can also just7 P$ p; P' ~' D: q+ y! I
remember the British Fi-cord brand of minature audio recorders, though 30 years later I found out
5 m7 T! v! a& qthat these tiny exotic machines were also made in Switzerland (by Georges Quillet it would
" Y  }7 p0 {0 e% M$ wappear). It was though perhaps obvious that the combination of minature electronics and precision
, x% Z6 r5 {& d( Qmechanics needed to make a high quality tape recorder would suit a country also known for
4 k0 }& E9 X) k- l; jwatchmaking, and one could argue that the end results would be some of the finest examples of
$ h" B7 w& J/ g2 s6 ~' b3 I20th Century electro-mechanical engineering.
7 S8 s& G% L4 r' \6 t& {' `6 t) F& H4 Y; b" R. e. q

2 m# ~" i( I6 T3 q$ a4 _% _* It is possible that he will collaborate in a book about hs machines, do please let me know if you
9 U2 e& ^! ^# y- _8 A4 R7 Jthink this a worthwile project and I can advise the author.$ F( T1 U7 V0 U

' n( B" r" |* o1 p
+ v6 l3 Y: n* j2 v7 }/ N
& R" p) u- W8 ^* K" u
! j/ Y; R# u7 ]. }$ e! r
                               
登录/注册后可看大图
  G" t4 I, b( j4 d/ b
2 o/ Q9 I. d, j

( ]# A7 g1 v7 U1 J, A' U
发表于 2012-10-14 03:25:11 | 显示全部楼层
More like an excercise in watchmaking than an audio recorder, the increasingly collectable Nagra SN is
5 x- h( j: ^1 m5 ?  Hyet another delightfully tactile object from this famous Swiss company.
. w7 b1 a+ g1 X7 D# g) S! l0 {% E9 {8 K( R$ K# u& x- u" L

4 f: j( @2 Q! ~) v1 NMr Tim Blackham's very early and un-legeneded example is shown above on the Left, and my own later
5 ^# ?2 e6 Y0 _4 |' h* wfull track mono* version is shown lower Right. These truly pocket sized and light weight reel-to-reel3 _" K8 A9 y/ c7 k% J, K/ [
tape recorders were in actual fact true professional sound recorders in every respect, and were a very far
  M- O% e4 u/ Mcry from almost every other similar sized tape recorder. While various 'toy' miniature tape recorders of
. x) P: C- j6 x1 D: Q0 mthe 'Misson Impossible type' produced results varying from excruciating to just plain bad, this little
- T1 D  U) K" E* GNagra gave real Hi-Fi quality. Actually I sometimes use mine into an HH AM8/12 amplifier and a
% W5 f4 _$ f+ I1 F& b% V0 jTannoy Monitor Gold in a Lancaster cabinet with pretty impressive results!4 |' P* d7 i1 d8 x$ K! n

. Y: W/ z. I( Z3 H: P& a. I/ h3 s8 N, f. Q0 V
With built-in 50 Volt capacitor microphone powering and a proper capstan servo system, the Nagra SNN5 t3 H& o8 m$ M; U# r/ g0 i+ D
was quite capable of making studio broadcast quality recordings at the relatively low speed of 3 3/4
/ _  U! l; w6 `inches per second on 1/8 inch wide tape. (Which was actually re-reeled Compact Cassette tape - see
4 c' ~* L0 l" C: qbelow.)
+ @0 B# u; k" \
. ?$ n5 h; _8 N4 X" M
% J' T1 M% A* c# L% t+ jPerhaps more famous for its 'security applications', this 'spy Nagra' was often used as a concealed film
) t( ^5 ]( z4 h3 C% alocation recorder before the arrival of reliable radio microphones. Simple in use; you just plugged the: b7 u# K: i+ t; v. W! p
microphone or line input lead into the machine to put it into record mode. It didn't have fast forward, and8 P7 H# L% Q' F  [5 A5 Q
rewind was done by hand by turning a miniature fold out 'starting handle'. But this rather quaint feature
/ h9 o4 U. u: m+ D" twas perfectly usable and saved the batteries.8 ~- F: y3 |6 T/ s9 r
( C, R* \9 ]% w' @8 q
) k( k- }$ i; ]3 N* ]
; B" B) q2 e. b* C6 t6 P
                               
登录/注册后可看大图
# S6 U: i8 j: j" X
The Nagra SNN Minature Audio Tape Recorder
7 a, @# l% ~1 d" W" @1 H7 L5 d, ?" F, [+ l& W6 T( I

: d9 t: T: P; y
Above is another view of Mr Blackham's unusual Nagra SNN. As far as I can see, apart from not having" D0 u. h$ d% N5 U6 H+ I; i
the various anodised legends on the deck plate, also absent are the adjustable AGC threshold knob and
* o, L8 a( b; M% I5 m# J2 |7 wthe transport lock-out 'switch' next to the meter. The cover 'hinge' arrangement differs slightly from later; u0 S8 y  `0 X
machines, as does the 'patina' of the anodised finish. A most interesting version, has anyone got another?3 _; d0 p: o; ]& T( l$ A* |

/ ^9 {; u" u2 n; o6 v(Apparently yes, I have recently been advised.); |, Z8 K9 ^5 J( f8 m# q) x7 o
5 K0 C( b3 u0 k) Q- ?/ X" h
1 O, J: O, |. J. n6 f  }1 a& ?% H
Click on either of the above images for more information.' h, f$ D# H7 ?) B5 Q, d

- \9 v2 e% j5 N) v: D, u2 J% y2 L
* For those who are looking at the stereo versions of this recorder often to be found on 'Eday', do
' i. z2 Z( e" u1 fbeware, as It is unlikely that these will be the recent versions designed to record high quality music.  k8 v% d/ a' {! H* b! j1 W
There are now apparently four versions of the Nagra 'SN':
! Q" |1 n- [" o. _% k& E/ f$ O& S- J, u. i! ^

# h, N5 k, {: A1 d# S6 s% q" cNagra SNN - full track recording at 3 3/4 and 1 7/8 i.p.s. - high quality recording in Mono9 s( \+ T) @1 e* I8 J

! j. H3 A$ ~- f2 c  |# rNagra SNS - half track recording at 1 7/8 and 15/16 i.p.s. - surveillance quality recording in Mono
0 Q, b. y) R5 F( b" ^" k0 D% K3 r# \4 w& @) h3 y! q% u
Nagra SNST - Stereo recording at 1 7/8 and 15/16 i.p.s. - surveillance quality recording in Stereo
3 _. V/ M. l, O: R, M
; f6 i5 \5 R; n5 E$ m, ANagra SNSTR (recent) - Stereo recording at 3 3/4 and 1 7/8 i.p.s. - high quality recording in Stereo
( H$ U( Q: x1 ~* a4 h4 m0 b6 t3 B# e: Z) M! u2 J
6 M+ |0 j* R! Y  u; `& P
Apparently for covert surveillance use it was preferable to have two separate recording channels to
5 l$ m' D6 O( lhave some chance of capturing a muffled or distant conversations. So these older stereo machines will  a7 U. J% b9 o6 y' Z* |1 P( Z8 ^
therefore be optimized for speech recording only, and will also run at low speed for maximum
& v# C5 P) t2 m' }recording time and not fidelity. Actually Nagra made a special playback loudspeaker system (251001 x5 K; E  `3 B0 W, ^8 m
DSP) with built in equalization to compensate for the quite limited frequency response of these
4 r, ]* n" P- r8 Vrecorders. A standard mono Nagra SNN running at 3 and 3/4, like the ones on this page are capable of- ~; o& J5 x1 H% V7 X7 w
truly Hi-Fi recording, but the slow speed SNS and the SNST stereo versions are not. Perhaps it might+ `4 z, g0 m- b- {8 o" Z
be possible to convert these machines for Hi-Fi use, but this would involve replacing most of the
5 d( c$ w$ E& X& x: ?6 |( yelectronics and be very expensive.
8 L9 p1 T) H9 W
  I; r; t6 a) D, b' \3 r& L; d1 `4 h3 G- C% ?
Cheaper to buy a rather better stereo IV-S in the first place!
: @9 u7 I# K: O3 L/ ?9 Z
* \- q! @' g$ ^8 o9 T4 p
+ N! e; I: t; t6 o0 [Tape for the Nagra SN: V! o9 k, c( B/ d
7 E  S" ~8 ]- O& M' B
& }* J" C' ~/ g) B9 [
I have been amazed at the prices some people have been willing to pay on that wild west auction site for
. V4 e# f/ \2 rthe little reels of tape for this machine. When I first acquired my example from the BBC naturally I
4 d# i, S6 M0 Y! awanted to play with it and make some recordings. I knew that the tape was basically re-reeled cassette! X( ~. o. [. |9 l7 q& o8 B) ?. ^
tape so I approached a tape duplication house in the UK and quite easily obtained a few part used1 E2 C5 P+ S) J" N. R8 M- h
'pancakes'. These are the un-flanged bulk reels of tape (about 10" dia) that are automatically wound into
( G6 o  P5 _0 a$ q# o& bthe cassette shells. I then contacted Nagra UK (always helpful) and obtained for around ?5 each
% y( u" ]5 I" ~several pairs of empty plastic reels. It then was quite a simple matter to wind tape off the pancake and" H; q. ]- S' v8 |
onto the Nagra plastic reel (by using the hand crank on the machine). I did this a few years ago and$ A; L: ^! X4 f5 R2 F
things may be slightly different these days, but perhaps worth investigating rather than spending some: @: r7 @0 x9 K. `5 B
VERY silly money./ p9 a7 r0 b  g0 F7 r* x( R! s

, J7 \2 y% `" v9 }' U( M; R) @5 Q0 Q0 T1 Z, u

- R/ X" X4 ?1 p4 \& J) J- u ) V( U1 L5 v& g. b' d( X

0 M; d6 `1 z  u# ~0 z9 g8 W3 c6 _( O                               
登录/注册后可看大图

$ ^7 O1 ~/ G9 e; D" }' @

' q, o6 B& J, n, Y; f, j8 E/ H

7 Y4 V% |* l% U7 V* ]( Y3 w+ a 0 v: t6 o6 b3 j& U1 F7 o( Q( O
! @  H1 n2 @2 q  E
                               
登录/注册后可看大图
3 w  O/ B6 T/ H
6-Inches
' M8 R. u; Y3 a; _4 V$ J
( n7 u$ x: J3 v/ e  s/ g+ ^

/ C  D/ e, I$ o3 K% Z2 @5 S9 ~  p
发表于 2012-10-29 10:51:43 | 显示全部楼层
多谢卢老师的解答,很详细.
您需要登录后才可以回帖 登录 | 注册加入

本版积分规则

手机版|开盘机音响技术网 ( 桂ICP备20003207号-1  公安部备 45010302002201 客服:18077773618

GMT+8, 2026-3-13 12:17 , Processed in 0.074360 second(s), 21 queries .

Powered by Discuz! X3.4 Licensed

© 2001-2013 Comsenz Inc.

快速回复 返回顶部 返回列表