INDUCTIVE  COMPONENTS   - Transformers Chokes and Loudspeakers

Home Up Resistive Fixed Caps Inductive Variable Caps

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Chokes - Power Supply Types   Smoothing Chokes Iron Cored Inductors 
Cat No.

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Description Condition Price


RF FILTERS IF Filters and Crystals

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Ceramic Filter 10.7 MHz.     Intermediate Frequency Filter SFE10.7M   Murata New Old Stock 0.45

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Ceramic Filter  BPMB8L

New Old Stock 0.45
L153 , Ceramic Filter Intermediate Frequency Filter LT465B New Old Stock 0.45

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Ceramic Filter  Intermediate Frequency Filter  SFU450B  DATA New Old Stock 0.40

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Ceramic Filter  Intermediate Frequency Filter SFU465B DATA New Old Stock 0.40
L160x Ceramic Filters  Other types available include :- CSB456F18, KMF C366A,  CSA4.00, CSA2.00, CSA16.93, New Old Stock Various
L200x Osmor Coils  A few of these available.  See original data sheet here.
The following 11 types only are now available:-
New Old Stock 

From 8.00

RF Coils, IF Transformers, Ferrite and Components
The values given for the inductances and resistances are a guide only and are approximate within the limits of my component bridges. 
Further data will be posted when further data are available.
The 10mm and 15mm inductors have two rows of pins  with 2 and 3 pins.  Winding A is the 3 pin row.
L411 Transformer Toko 15mm
Two windings, one approx centre tapped bifilar wound Adjustable 8 to 15mH approx.
Secondary 2.5 to 4mH approx.   

With windings and top adjustment cap removed
New Old Stock 0.30
L413 Transformer Toko 15mm.  Construction as L411
Single coil with taps at 10% and 50%.
Total inductance adjustable from 5 to 11mH.
New Old Stock 0.30
L421 IF Transformer. 10.7MHz Toko N2791PQP  X2792SBS.
10mm x 20mm.
New Old Stock 0.90

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Inductor.  Toko 10mm Type FT06424.  Single winding 3 turns.  With adjustable ferrite core.   
Approx 1 micro Henry.   
With 50 loose turns wound on, the coil is adjustable from approximately 100 to 200 micro Henries. 
Can is easy to remove on these coils. 
Cut the corners a few mm up from the base and slightly peel back - the coil falls out.  Can is then reusable.
New Old Stock 0.20
L428 IF Transformer (10.7 MHz ?) 10mm 7A-247R.  Blue Core
Equivalent to RadioShack 10564987
Two Windings.   Construction as L427
A. 4 µH 0.4 ohm with parallel capacitor.
B. 13µH 0.5 ohm.
New Old Stock 0.65
L429 IF Transformer 10mm 460-470kHz with external capacitor. 4A-363R
Equivalent to Sony 012-003630-010:  Aiwa 6144SCA006IFT
Two Windings.   Construction as L427
A. Centre-tapped 31µH 1 ohm.  Adjustable from 25µH to 50µH
B. 1.1mH 9.5 ohm.  Adjustable from 1.04mH to 2.0mH.
New Old Stock 0.45
L431 IF Transformer 10mm  1A621R
Two Windings.   Construction as L427
A.  350µH 3.4 ohm with tap.  Adjustable from 300µH to 450µH.
      Tap is at approximately 10%
B. 1.5µH 0.1 ohm. 
New Old Stock 0.55
L432 Inductor 10mm  FT06432
Single winding of approximately 0.5µH.  With adjusting slug
(Winding connected to the outer pair of the 3 pins)
New Old Stock 0.20
L434 IF Transformer 10mm FT06430
Two Windings:-  
A.  720µH 5.8 ohm with tap and parallel capacitor. 
Adjustable from 500µH to 920µH and tuneable from 420 to 500 kHz.    Tap is at approximately 5%
B. 0.6µH 0.3 ohm. 
New Old Stock 0.45
L461 Ceramic Former.  Ceramic Core/Tube 60mm long, 12mm diameter with 7mm diameter longitudinal hole. Unused 0.35
L462 Coil Former. ICM 187A.  19mm square x 14mm deep. Core 8mm square with 10mm width. 
Central hole 7mm square.
Unused 0.10 or 5 for 0.35
L471a Brass Tuning Slug  -  12mm long x 6mm outside diameter.  Pitch approx 1mm.    Matches 25 BSW pitch.  End slotted. Ex equip 0.30
L472 Ferrite Core. Tuning Slug.  Both ends slotted.  2.7mm OD 8mm long with a thread pitch of approximately 0.5mm. New Old Stock 0.25
      Used? 0.50
L475 Ferrite and Brass Tuning Slug.  
5.3 x 15mm ferrite, 13mm brass. 54mm overall. Slotted 6BA thread
Used? 0.50
FERRITE CORES   Pot Cores and Ferrite Rods  See also below for wound components
L548 Ferrite Core Mullard Philips FX1115 Screening Bead. Grade A1 ferrite
4.3mm diameter, 1.3mm diameter hole, 5.8mm long.
Adds >25 ohms impedance at 10-40MHz when threaded on wire.
New Old Stock 5 for 0.25
L547 Massive Ferrite "I"  FX2263  Solid but may have small chips from storage.
Matches L548 FX2264 to form complete core with 45mm square opening.   50 x 50 x 155mm.  2kg
Unused 4.25
L548 Massive Ferrite "U"   FX2264  Solid  but may have small chips from storage.
100 x 50 x 155mm.   3kg
Unused 7.25
L591 Ferrite Pot Core Vinkor - Mullard LA1421 pairs. 
Mullard Data Sheets HERE. (pdf 300k)
This is the replacement type for the LA1291, LA2901 and LA2936 according to Mullard data. 
Approx 94 turns for 1mH or 113nH per turn.  
No adjusters available.  10mm diameter, 7mm high as pair.
Unused Old Stock

10 pairs for 1.20

L613 Mullard LA5 Vinkor. 
Original 35mm range LA5 Inductor, replaced later by LA1174.
Silver plated brass plates.
<70 turns per mH.   2 only left.
Unused 11.00
L615 Mullard LA7 Vinkor. 
Original 35mm range LA7 Inductor, replaced later by LA1212.
Silver plated brass plates
<39 turns per mH.
Unused 9.20
. . A few other ferrites beads and pot cores available such as  LA1497, LA1530, LA4328 and LA4344.  To be listed.
Some information on the Mullard Range is in the Data section HERE
See also below TPnnn and TSnn for wound, low-frequency Ferrite Pot-Core types
. .
RADIO FREQUENCY CHOKES     Various types available - multi-section etc.
L723 1mH RF Choke Ceramic former.
One only
L800 . Fixed Inductors - various modern and vintage from 1µH to 10mH
Cambion Moulded Inductors.  A small range now available.
  From 0.25
AUDIO and Low Frequency Inductors, Output Transformers, Driver Transformers  and Loudspeakers GBP
TP032   Valve Output Transformer Wharfedale W12
Used  22.00
TP201 . RS 217-646 Driver Transformer for Transistor Circuits 5mW
Ratio 3.6:1+1    3k to 250 +250  ohms. PCB mounting
27 x 20 x 21mm                                                                                                                                   
New Boxed 7.60
TP202 . RS T/T2 Output Transformer for Transistor Circuits Radiospares (RS) T/T2 - 200mW into 3 ohms.
Ratio 6.6:1 with centre tapped primary see RS data sheet for details
19 x 17 x 17mm.  For two OC72.
Unused Old Stock 5.55
TP204 . RS T/T4  Output Transformer for Transistor Circuits Radiospares (RS) T/T4 - 50mW into 3 ohms.
Ratio  9.2:1 with centre tapped primary see RS data sheet for details
20 x 17 x 17mm.  For single transistor (OC72).
Unused Old Stock 5.55
TP205 . RS T/T5 Driver Transformer for Transistor Circuits Radiospares (RS) T/T5 - 2mW
Ratio 5.5:1+1 split secondary see RS data sheet for details
27 x 20 x 21mm.  For OC81D driving two OC81.
Unused Old Stock 5.55
TP206 RS T/T6 Driver Transformer for Transistor Circuits Radiospares (RS) T/T6 - 2mW
Ratio 2.8:1 with centre tapped secondary  see RS data sheet for details
27 x 20 x 21mm.  For OC81D driving two OC81.
(This looks the same specification as the T/T5 !!)
Unused Old Stock 5.55
TS207 RS T/T7 Push-Pull Output Transformer for Transistors Radiospares (RS) T/T7 -500mW
Ratio 9.2:1 with centre tapped primary see RS data sheet for details
37 x 24 x 30mm.   For 3 ohm loudspeaker and 2 x OC81

New Boxed
Used Tested

TS210 . Output Transformer for Transistor Circuits. LT700   500mW
1200 ohms centre tapped to 3.3 ohms 500
PCB Mounting with flying leads
New Boxed 5.80
TP225 Push-Pull Output transformer for transistor circuits. 300mW approx.
Ratio 6+6:1.  Primary inductance 0.3H +0.3H, resistance 32 +32 ohms, approx.
Secondary inductance 12mH, 0.4 ohms.
For pcb mounting 20x15x15mm.  Flying leads
Unused Old Stock 6.55
TP234 Auto-Transformer RS Tapped choke.  150mH at 900mA.
For matching 3 ohm, 15 ohm and 60 ohm impedances.  For use in transistor output circuits or as a power supply choke.  Uses special grain-oriented laminations.
68 x 53 x 57mm.  82mm fixing centres.
Unused Old Stock 9.55
TS27 TS27.jpg (36444 bytes) Audio Transformer  Impedance Matching type TS27

General-purpose and line matching - power rating 10W.  Ratios from 4 to 40:1.  Click HERE for some test data and impedances.

 70 x 40 x 45 overall    ;  330g       

Unused Old Stock 5.75
TS280 1to1 Trans.jpg (21557 bytes) Audio Transformer  Isolation and Impedance Matching.  1:1  600 ohm nominal.
Type 26343      Useful for solving earth loop problems.
28 x 26 x 22mm excluding 6mm pins.
Unused Old Stock


TS282 . Audio Transformer  Isolation and Impedance Matching. Oxford Electronic Products 1+1 : 6.46+6.46
Type A262A3E.  See Data sheet HERE.
Versatile impedance matching transformer
28 x 22 x 22mm excluding 6mm pins.   Farnell £13
New Old Stock


TS290 RS217-775.jpg (26368 bytes) 100 volt line Loudspeaker Matching, 30W.  RS type 217-775.
For 4, 8 and 16 ohm speakers, tapped for 1, 2, 5, 15 and 30W output.    1.00 kg.  (RS replacement price 21.00)
New Old Stock 9.90
TS340   Loudspeaker Isolating Transformer, RS "Midget". 
"Ratio 1:1 for 3 ohm speakers but gives good results up to 15 ohm, flash tested at 2kV".  RS Data.
Rated 2W.   45 x 38 x 30mm.  54mm fixing centres
New Old Stock 5.40
TS410 AF Choke Wearite 214. approx 170H.  total dc resistance 5,100 ohms approx. Tapped at approx 33%.   37mm high excluding terminals, 28mm diameter.  Some Mounting clips available. Possibly tape recorder spares?  New Old Stock 5.40
TS420 As TS410 AF Choke Wearite 213. approx 170H.  dc resistance 5,100 ohms approx
37mm high excluding terminals, 28mm diameter. 
Ex Equipment 3.90
TS59 . Transformer . Ferrite toroid with 5 windings. 24+24+24+30+30 turns
Inductance of 24 turn winding 0.65mH, 50 turn, 0.95mH
15mm diameter, 0.9mm over windings.
Unused 1.60
TS70x Ferrite Pot-core Inductor Choke.    14mm diameter cores. Overall 15 x 15mm 21mm high above PCB. 28mm centres mounting holes. Used, some with a tap.
With clips and adjusting cores. sealed with wax which can be melted to adjust. Values available - mostly only one of each:
  22;  29;   0-20-30;   37;  38;  0-25-39;  48;  49;  0-32-50;  77;   0-65-103;   0-80-125;   0-100-160;  mH
Ex Equip


TS75x Ferrite Pot-core Inductor Choke.   22mm diameter cores. Siemens. Overall 23 x 33mm 12mm high above PCB.
Used, some with a tap.
With clips and adjusting cores. sealed with wax which can be melted to permit adjustment.
Values available - mostly only one of each:

 67;  200;   240;  0-200-250;  250;  310;  0-200-315;  315;  390;  400;  0-260-410;  510;  0-330-520; 
630;  640;   800;  0-510-800;  820;  900  mH 
 0-.82-1.0;  1.0;  1.26;  0-0.81-1.3;  2.0;   0-1.3-2.0;  2.1;   2.5;  0-1.6-2.5;  0-2.0-3.1   Henries
Ex Equip


TS80x Ferrite Pot-core Inductor Choke.   35mm diameter cores.  Overall 23 x 33mm 21mm high. 
Used, some with a tap. Approx 105g

4.9;  5.0;  0-3.7-5.9;  6.0;  0-4.8-7.6;  7.6;  8.1;  9.6;  0-6.2-9.8;  10;  12.5;  12.6;  0-7.5-12.7; 15.5;  15.8;  0-9.6-16.3;  Henries
Ex Equip


TS85x Ferrite Pot-Core Inductor Choke.    45mm diameter ferrite 50mm overall diameter, 42mm high.
4 threaded mounting feet. Approx 350g.
0-21-35H;  35H;  44H;  
Ex Equip


Power Supply Chokes - Smoothing Chokes
Output Chokes for Loudspeakers
TS15 Output Choke 150mH at 900mA  2.5 ohm.  
For matching 3 ohm, 15 ohm and 60 ohm impedances. 
For use in transistor output circuits or as a power supply choke. 
Uses special grain-oriented laminations.
68 x 53 x 57mm.  82mm fixing centres.
Unused 8.50
CH111    Vintage Output Choke for Quiescent push-pull operation RI

Possibly unused 45.00
Power Supply Chokes   Filter Chokes - Power Supply AF Chokes - Smoothing Chokes - HT Chokes
CH229 Choke 0.1H 1A. Gardners Ex Equip 8.20
CH235 Choke 0.12H <0.2 ohms.  Power supply choke
95 x 70 x 80mm
Ex Equip 9.50
CH237 Choke 0.2H 0.5A. 
Drop through type
Ex Equip 9.50
CH241 Choke 6.5H 210 ohms. Gardners GR26501  Gardners Power Supply Choke  Rated at 5mA DC.
21x21x 35mm. Mounting holes at 28mm. 
Ex Equip 8.50
CH267    20H 180mA  250 ohm Parmeko.
Neptune Parmeko Choke, sealed type, ceramic terminals.
95 x 90 x 120mm
Ex Equip  77.00
CH272  . 80H 100mA  200 ohm nominal, 165 ohms measured.  Collins 8400-D Rectifier Filter. 
Power supply choke.  Drop through chassis mounting.
65 x 65 x 100mm. 6 mounting holes at 3 pairs of 80mm centres.
Ex Equip 62.00
LS101 LS101.jpg (29187 bytes) 8 ohm 100mm Speaker.   General Purpose replacement Speaker.  New Old Stock 1.80
LS102 LS_RS248-549_35ohm.jpg (22245 bytes) 35 ohm 85mm 3.375" Loudspeaker.    RS type248-549. Unused, boxed.  35mm deep. 71mm FC.  Old Stock



Last update:   November 08, 2019