The Spontaflex Reflex Web Page

Very interesting article explaining how automatic reflexing occurs in the Autoflex (Spontaflex).
Circuits for 2, 3 & 4 transistor receivers
MAT101 OC72 OA81

Silicon Spontaflex

may 1969

Modifications to enable the original Autoflex to incorporate silicon transistors and improve performance
2N3707 2N2926 OA81

SuperAlphadyne

May 1976

High Selectivity Receiver
LW/MW down to 120 metres
BF167 BC169C OA10

6S3T
Short Wave
Receiver

Aug 1964

3 Transistor 6 Stage coverage 19 to 75 Metres
MAT101 MAT121 OA81

6S3T
Short Wave
Receiver

Dec 1978

Modified for Silicon Transistors
2N3707 2N3663 BC169C OA81

Beginners
Portable
Receiver

Jul 1967

A simple MW/LW Circuit
MAT101/121 OC81 GEX64(CV2310)

DRC 2

Jan 1968

Spontaflex Shortwave 1.25 to 15 Mhz
An idea of the ingenious reflex operation is given by the
fact that the headphone output and the aerial input are connected to the same emitter
MAT101/121 OA81

DRC 2

Feb 1970

Modified for silicon Transistors
2N3707 2N2926

The Hybrid
All Wave Radio

Aug 1978

Continuous Coverage
from 16 to 2000 metres
ECH83 BFR99 BC169 OC22 IS44

DRC 3

Jun 1972

Very sensitive double reflex Colpitts SW Receiver. This receiver takes advantage of permeability tuning to provide an exceptionally high L/C ratio at all frequencies covered from 1.5 to 22Mhz.
2N3707 BF115 BC169C OA91

Comprehensive
Volume Control

Aug 1966

Single Potentiometer controls
RF Gain: Regeneration: AF Gain
XA101 MAT101 AC127 OA81

Watersport
Portable

Feb 1980

High Selectivity MW/LW Receiver
Built in Wavetrap
2N2926 BC169C 2N3663 OA10

Singlespan Hybrid

Oct 1964

Continuous Tuning without switching
From 150 to 2100 Metres
MAT101 EL41 OA81

SA 3

Dec 1969

High Q MW/LW Receiver.
100pf tunes the full MW band
BF225 2N3707 BC168B OA73

SA 4

May 1968

Permeability Tuned
Super Alpha Pair
MAT101/121 OC200 BSY26/27 OA73

SA 5

Jun 1971

5 Transistor .Super Alpha Tuner.
Exceptional Selectivity and Sensitivity
BFY51 BC168B BF115 OA5
(for OA5 use base/emitter junction of AC176 or similar)

Hybridyne

Apr 1973

MW Hybrid 3 transistors 1 Valve
2N4289 BC169C DL96

Band II
Portable

Mar 1979

Very Sensitive VHF FM Receiver
BC169C 2N3663 2N4289 2N3707 2N3405
OA81/91 IS44 BZY88C6V2 BZY88C3V0

The Stereosim

Jul 1971

LW/MW Tuner & Stereo Amp
Quasi-Stereo Effect on Mono
BC168/169 AD162 OA91 DD000

Caravan Receiver

Apr 1966

Sensitive MW/LW Hybrid
Draws only 100mA from Car Battery
3Q5GT(DL33) MAT101/121 GECS5=ACY19/ACY21

Pentonlector
Amplifier

Jul 1966

Simple & Neat Hybrid Amp
Good Quality reproduction
PL82 XC141 DD000

The Droitwich
Car Radio

Nov 1971

Long Wave Car Radio. Preset to 200Khz.
3 Transistor 1 valve Hybrid
2N4289 BC169C AD161/AD162 ECH83

Triple-s

Nov 1968

Simplicity and Sensitivity with 3 transistors
2N4058 2N2926 OA73

Singletran

Aug 1963

A single transistor circuit which offers a loudspeaker
output when a strong local signal is available
GET114 or GET103 OA81

Multi-Tuner

Feb 1967

Six functions and the only switch is the on/off button
OC44 OA81

Bass-Boost
Portable

Apr 1972

LW/MW 2 Transistor. Loudspeaker Output
Positive feedback bass boost control
BF115 BC169C OA73

Spontaflex DR4

Mar 1966

Seven Stage MW Receiver
3 or 4 Transistor Circuits
MAT101 XA701 AC127 GET103 OA81

Sliding
Challenger

Aug 1970

250mW 3 Transistor Class A Amp
Battery economy equal to Class B
BC168C MC140 or BFY51

DRC Junior

Oct 1973

Similar to DRC3. Easier to build.
BC169C BF115 OA73

Miniflex
Dual Purpose
Receiver

Jun 1968

Miniature 3 transistor MW receiver.If desired an external speaker may be plugged in whereupon a larger battery is automatically connected and the output circuit is altered for optimum operation
AF117 ACY21 M3=LED

Miniflex MK II

Jul 1968

3 transistor MW/LW tuner
ST141 AC127 M3=LED

Miniflex MK III

Dec 1970

2 transistor MW/LW tuner
BF115 M3=LED

Miniflex MK VI

Oct 1971

LW/MW 3 Transistor(1 FET)
Loudspeaker output and only 3mA consumption
40468A BF115 M3=LED

Transportable

Nov 1969

MW/LW Hybrid 3 Transistors 2 Valves.
Mains or Car Battery Powered
2N4058 BC168B OC22 OA202 DD000 EF97

Universal
Car Radio

Apr 1969

6 or 12 Volt supply. Positive or Negative Earth
2 Valve 4 Transistor Hybrid
2N4058 2N2926 OC19 OA81 GEX64(CV2310) EF97

Class A
Amplifiers

May 1966

4 Transistor Receiver Example
Using Direct or Transformer Coupling
MAT101 AC127 GET103=OC72/OC81 OA81

Class A Amp

Jan 1970

Class A Battery Amplifier.
Optional MW Tuning Head
BC168C 40468A 2N3702 OA81 IS44

FM Spontaflex
MkI

Jun 1969

4 transistor FM Receiver
BF225 BC168C 2N4058 OA81

FM Spontaflex
MkII

Feb 1972

Several Modifications
and Improvements

L C Meter

Apr 1967

Measures Inductance 7 to 2000 henrys
Capacitance 0.002 to 1.5uf
Also functions as a capacitor substitution box

Jubilee
AM/FM Receiver

Jul 1977

3 Band 5 transistors
2N3663 BC169C 2N4289 2N3405 OA10 IS44

Export
Spontaflex
Portable

Feb 1971

Specifically designed for reception
of Short Wave Broadcast Transmissions
Attractive project for overseas constructors
2N3707 BC168B TIS61(2N3702) OA81

Infinite
Resistance
Voltmeter

Oct 1968

Draws no current at all
from the circuit to which
it is connected

Variometer

Jul 1963

Variometer tuned MW/SW Circuit
One DF96 Valve and a Variometer from a No19 Set

Fetaflex 4
Portable

Apr 1970

Double Reflex Receiver
40468 2N4291 2N4285 BC168C M3=LED

Super
Regenerative

May 1965

Super-regenerative 3 Transistor
MW/LW Receiver
MAT101 OC72 OA81

3 From 1
Short Wave
Receiver

Feb 1966

Triode Pentode functions as
aperiodic RF Amp. Detector with reaction
and reflexed Triode Output
3A8GT

VHF Reflex
Portable

Jan 1973

40 to 110 MHz AM/FM
Low battery consumption
BF167 BF169C BTY51 OA85

Simplicity and Sensitivity
With 3 Transistors

Nov 1965

MW/LW Receiver with Loudspeaker Output
MAT101 OC72 OA81

Twin Pentode
Receiver

Dec 1965

Quality and Sensitivity with two Pentodes
uses inductors from surplus RAF A1134A Amp.
DAF96 DL96

Economic Amp and Variable
Inductance Tuner

Jan 1964

2 Transistor
MW/LW Receiver
with Loudspeaker Output
OC44 OC72 OA81

Simple Circuits
for Short Aerials

Sep 1963

3 Circuits using a 1D8 Valve

S.A.Junior
Portable

Nov 1972

Sensitive and Selective 3 Transistor
MW/LW Receiver
with Loudspeaker Output
BF115 2N4289 OA5

Kangaroo
Radiogram

Aug 1969

Hybrid MW/LW Receiver & Record Player
ST141 AC127 OC22 PL82 M3(LED)

Quasistor
Tuner

Apr 1974

Quasi-Stereo
VHF Receiver
BF167 BC169 2N4289 1GP5

Drachma
Portable

Dec 1975

SW 5.5 to 22 Megs
VHF 75 to 105 Megs
BF115 BF167 BC169 OA90

M5 Pocket
Receiver

Apr 1977

4 Transistor MW
Loudspeaker Circuit
BF167 BC169 2N4289 BF115 1S44

Diodyne
Receiver

May 1980

Mains powered Hybrid
DL96 BFR81 BC169 OA90

Doric Multiband
Receiver

Aug 1979

6 Shortwave Bands plus MW/LW/VHF
Comprehensive 21 page Construction Article
BF115 OA90 1S44 2N4289 2N3405 2N3663 BC169

Local Station
Tuner

Feb 1968

One Transistor Tuner
for the Pentonlector Amplifier
BSY27 M3(LED)

Junior
Radiogram

Sep 1967

Incorporating a Hybrid Local Station Tuner
The Valve is heated for free
as the heater is the emitter resistor of the output Transistor
DL96 AC127

Simplicity and Sensitivity
with two Transistors

Apr 1964

Simple MW Receiver
MAT 101

Hybrid TRF

May 1963

MW Receiver
DL96 OC44 OC72

Mains Reflex Circuit

Oct 1963

Uses two 117N7 valves with 117V Heaters connected in series across the Mains
NB.LIVE CHASSIS

Port & Starboard
Stereo Amplifier

Oct 1976

Unusual tone control.A single gang pot alters the tone
of both channels by varying the current
through two MES 6V bulbs
BF244b 2N4289 AD161

Hiflex MW/LW
Personal Receiver

May 1973

2 Transistor headphone circuit
2N3819 2N4289 OA81/91

Biflexet

May 1974

2 Transistor Local Station
Loudspeaker receiver
2N3819 2N4289

Sliderule Receiver and
Capacitance Meter

May 1975

Long Medium & Trawler band
Measures Capacitance up to 5000pf
BF167 BC169 OA10

Improving TRF
Reaction

Dec 1963

Improving Reaction of
the Pocket 4 Kit

Double Reflex
Personal Receiver

Oct 1974

Short Wave Biflexet
Low Z Headphones
2N3819 2N4126 1S44 1SJ50

The Beta Meter

Oct 1967

Simple Transistor Tester

Cascode MW/LW
Portable

Feb 1978

New High Gain Circuit
2N4058 BC169C

The Dualine

Nov 1973

VHF+MW Portable
BF167 2N4289 BFY51

Economical
Hybrid Amplifier

Dec 1964

With optional LW/MW Tuner
DL96 OC75 OA81 MAT101

Modifying Published Designs

Jan 1967

Usefull tips for the Radioconstructor

Sliding Junior Amplifier

Jun 1973

Sliding Bias Amp
for the Hiflex Receiver
2N4289 BFY51

Mains Micro Amp

May 1978

A Unique AF Amplifier
DL96 BFR81

Lisa 2 Band portable

Sep 1980

SuperAlpha LW/MW Loudspeaker Circuit
2N3663 BC169C

3 band portable

Dec 1974

2T Reflex 19 to 60 metres
2N3819 2N4126 2N4289 BFY51

F E T Twin

May 1972

Medium Power Stereo Amp
40468A 2N4289 AD161

Various Circuit Updates

Mar 1981

Updates to the M5: Jubillee: Cascade: Doric: Lisa:
FM: Superregen

Sir Douglas Hall

Jun 2002

About the Author

Communication
3 Valve Superhet Reflex

Dec 1943

First Circuit Published
in Practical Wireless

Voltage Stabilisation
for Car Radios

Dec 1962

First Circuit Published
in The Radio Constructor

Database

Jul 2002

Title,Date,Wavebands,Transistors,Diodes,Valves
Coils & Transformers used in every Receiver.
Compiled by David Teague
Comma separated text file.Loads into any spreadsheet

The following articles were published in
Radio Bygones from 1990 to 1999
Back Issues are available here
(please mention the website if ordering back issues)

Vintage Circuits
Updated

Apr 1993

Several updates and modifications to allow the use of
currently available components where required
Radio Bygones No.22

The Biflexet
Audio Reaction Circuit

Jun 1996

2 Transistors BF244B(TIS73L) BC258C
similar to John Scott-Taggarts S.T.700
Radio Bygones No.41

Singlevalve
Loudspeaker Radio

Jun 1991

MW/LW Receiver using a
singles 1D8 Valve
Radio Bygones No.11

FM Tuner

Dec 1997

Simple 2 Transistor Tuner
2N3663 or BFY90 OA81
Radio Bygones No.50

Miniflex

Aug 1998

3 transistor MW Receiver
OC44 OC72 LED
Radio Bygones No.54

60's style
Portable

Apr 1994

3 Transistor
MW/LW Receiver
ON222(BF181) BF254 BC258C
Radio Bygones No.28

6S3T
Short Wave
Receiver

Feb 1999

"Back to square one"
Interesting article on the 6S3T
by C.M.Lindars
Radio Bygones No.57

Early Transistor & Diode Data

Ediswan/Mazda G.E.C. S.T.C. A.E.I. Hivac Texas

Links

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