Eico 950B - General Instructions for Assembly; Unpacking the Kit; Construction Hints; Parts List for Construction

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GENERAL INSTRUCTIONS
Care taken in the construction of this instrument will reward the constructor with many years of satisfactory service and
greater confidence in his instrument. We urge you to not rush the construction, but to take all the time necessary for
_ proper assembly and wiring.
Furthermore, we urge strongly that you follow the wire and parts layout shown in the pictorial diagrams as closely as
possible. This is important because improperly placed leads will result in stray pickup and increased distributed wiring
capacity.
UNPACKING THE KIT: Unpack the kit corefully and check each part against the parts list including those parts that are
mounted to the chassis. If you have trouble Identifying any parts, refer to the pictorial diagrams or the color code chart.
You may find that the value of a component will vary within the allowable circuit tolerance. Asan example, a 470K
ohm resistor may have substituted for it a510K ohm resistor ff the circult Is such as to allow this substitution. In general,
resistors and controls have a tolerance of +20% unless otherwise specified. Therefore a 100K resistor may measure any-
where between 80K and 120K ohms. Tolerances on capacitors are even greater, unless specified. Limits of + 100% and
“50% are usual for electrolytic capacitors.
CONSTRUCTION HINTS: USE THE BEST GRADE OF ROSIN CORE SOLDER ONLY, preferably one containing the new
activated fluxes such as Kester "Resin-Five", Ersin "Multicore" or similar types. UNDER NO CIRCUMSTANCES USE
ACID CORE SOLDER ORACID FLUX since acid flux can cause serious corrosion. Before soldering make certainof a good.
mechanicel connection. Use a clean, freshly tinned soldering fron, no smaller than 100 watts, and place the solder on the
joint (not on the iron)so that the solder is melted by the heat from the joint Itself. Do not remove the soldering fron until
the solder flows and check to see that the resulting joint is smooth and shiny when the solder has cooled. There are two
extremes to be avoided; too little heat and too much heat. If too little heat is applied, the joint will appear pitted and
grey, indicating a rosin joint which is unsatisfactory. On the other hand, if too much heat fs applied to a joint, the parts
connected to it may either change value, lose their protective coating, or break down. If you are soldering close to a
part, hold the lead between the part and the joint being soldered with the tip of a pair of longnose pliers. The pliers will
conduct the heat away and prevent the component from being unduly overheated. If for any reason it is necessary to re-
solder a joint, be sure to use new solder.
It should alsobe noted that the leads on transformers, capacitors, and resistors are very often longer than necessary. These
leads should be trimmed to the proper length when wiring.
PARTS LIST
Stock# Sym. Description Am't. Stock# Sym. Description Am't.. Stock? Sym. Description Am't.
88021 Al MING! ic Gos Wye oss o a we ] 11027 R2 res.,250K,1/2W,1%... 1 58501 W3 wire, bare ........ pc.
81054 A2 IMSS Serene wine ac, eJeeatet 1 10030 R3 res., IMQ, 1/2W..... 1 58300 W4 tubing, thin (spaghetti). pc.
81055 A3 bracket, eye tube ...... 1 11002 R4 res.,202,1/2W,1%... 1 58301 W5 tubing, heavy ..... pc.
80028 A4 DOO clone oe ien 4s etd 1 T1011. R5 res.,2KQ,1/2W,1%... 1 97003 XVI socket, octal, saddle ... 1
87000 A5 yest Leek Fc Sn RA 1 11026 Ré6é res.,200KQ,1/2W,1% ..1 97013 XV2 socket, octal, molded ... 1
23006 Cl cap. ,elec8mfd-525V .. 1 10803 R7 Eat OSS | LW cies aives 1 40000 nut, #6 hex .....eeeeee 5
21500 C2 cap,,200mmf,prec. ... 1 10848 R8 res. ,68KQ,1W ..----- 1 40001 nut70/0 Next. ae sce 7
20500 C3 cap., .02mf, prec. .... 1 10027 R9 res.,270KQ, 1/2W .... 1 40008 nut, #8 hex .........- 8
20501 C4 cap.,2mf, prec. ..... 1 10037 R10 res., IOMQ, 1/2W ... 1 41000 screw, 6"32X 1/4 .... 5
20000 C5,6,7 cap., .0lmf, 400V.... 3 10818 RII POsa 2.2 Reap IW Fons oss 1 41001 screw, 10-24 X1/4 ... 2
20015 C8 cap., .25mf- 600V... 1 10028 R12 res., 470K, 1/2W ..... 1 41002 screw #6P.K. ....... 9
23008 C9 cap. ,elec4mfd-250V .. 1 42000 washer, 3/8 lock ...... 4
53006 £1 ENOW DOL fay 6 x'si0is a cate 3 60030 SI switch, range ......... 1 42001 washer, 3/8 flat ...... 4
53500 £2 knob, pointer ......... 1 $2 switch, SPST, p/o P2 42002 washer, #6 lock ....... 5
46000 £3 grommet, 3/8" rubber .. 1 30005 PTI transformer, power .... 1 42008 washer, #8 lock ...... 4
46005 £4 feet, rubber .......... 4 54001 TBl term. ,strip, 1] post right .. 1 42017 washer, #8 fibre flat ... 4
52001 J174 post binding’ ./..'\..s0)."s 4 54006 TB2 term. ,strip,3 post, 2 right. 1 42018 washer, #8 fibre shidr .. 4
17000 PI Bates CUORSA eats e inne «2 1 90009 V1 PODE OMS Aiidias 4c vies ces 1 43000 luge "8 qnd es vee wees 3
18007 P2 Pot KO Wy SPST. obit Ls in POOLS V2 ROBO G28 et, oss vals 1 43001 lug s73/8 ONG Ales © oes; 2
19005 P3 pot., 100KQ,4W ...... 1 57000 WI finuicord sr ete 1 43004 log AS the eet cone es 4
10752 RI res.,500Q2,4W ...... ] 58000 W2 wire, hook-up, .... pe. Instruction book
NOTE: When ordering replacement parts, please includeall of the following information: 1) part number and description
given in parts list; 2) quantity; 3) model number of instrument; 4) serial number of instrument (on panel). This infor-
mation will expedite the processing of your order and insure your receiving the correct replacement parts.