Valve amplifier schematic from 1947 wireless world article by d. The values of the smoothing resistor r17 given in the circuit diagram are suitable for use with the mullard designs for two and three valve preamplifiers. Figure 1 shows several pushpull tube amplifiers only the power tubes and the output transformers primary winding. The anodes are connected to the primary winding, the cathodes to ground circuits 1, 2, and 3, and the middle of the primary to the highvoltage supply. Jan 07, 2018 this is a quick tutorial with our service technician taking you through the circuit of the mullard 510 valve amplifier, a british vintage classic from the late 50s, early 60s. Phone 718 9378300 toll free 800 6335477 fax 718 9379222.
Mullard tube circuits for audio amplifiers code 2005 the first notable contribution of milliard design engineers to the specialist world of highquality sound reproduction was the now famous fiveten amplifier circuit which was introduced in the summer of 1954. For the rest, this is a catalogue of mullard radio valves and electron tubes, and it contains descriptive details of every type in the current manufacturing programme. An ef8 variant of the tube is known as for the ef86 under normal conditions, i. Mullard circuits for audio amplifiers wave listener and building my own one valve receiver radio luxembourg on metres and horace batchelors adverts. These started out as being published in their technical bulletins and were later collected into book form. Stern mullard amplifiers 510 and 33 advertising leaflet. B amplifier or modulator driven by two el34 in directcoupled cathode follower circuit see circuit, a. The drive circuitry of the control grids is not shown i assume perfect. The values of the smoothing resistor r17 given in the circuit diagram are suitable for use with the mullard designs for two and three valve pre amplifiers. Goldthorp and tollow of mullard head office testing the popular mullard range of audio amplifiers. Stern mullard 2 valve pre amplifier control unit mkii. Jan 01, 2018 this is a quick tutorial with our service technician taking you through the circuit of the mullard 33 valve amplifier, a british vintage classic from the late 50s, early 60s. It has 20% ulatra linear taps and matches the 6k6 anodeanode impedance with 4, 8 or 16 ohms.
In these circumstances, the overload point of the amplifier is reduced from or 14 w to approximately 12 w. The consistent use of the same type of valves is partly historical, since many modern amplifiers are derivations or merely copies. Designing power supplies for valve amplifiers is a unique guide to the operation and practical design of linear power supplies, especially for valve equipment. Here is chapter 3 of the mullard hifi book in which the circuit is published detailing the design criteria. In view of the enormous popularity of the mullard 510 valve amplifier, it appeared that a 10watt output would be adequate for normal use. Brown, was present and took the opportunity of addressing the guests. Up for sale is a mullard tube circuits for audio amplifier book. If you have any stern equipment you wish to dispose of then. Mullard tube circuits for audio amplifierspower amplifiers and pre amplifiers for monaural and stereophonic reproduction from microphone, radio, tape and. This is a list of european mullardphilips vacuum tubes and their american equivalents.
A close up of the mains and ht side of the amplifier. I shall not give you a step by step building manual, only some guidelines. In the foreground, the 10w and 40w transistors amplifier may be seen. Mullard technical handbook book 2 part 2 valves nov 1973 electrooptic devices, radiation detectors. Jun 25, 2018 mullard circuits for audio amplifiers the prototype output transformer is designed for the distributed load configuration. Pdf btw162dv btw162idvr m2778 m871523rst 10a fast gate turnoff thyristor m2739 m2778 thyristor equivalent mullard thyristor r mullard diode iec4 gt250 v125. Most postwar european thermionic valve vacuum tube manufacturers have used the mullardphilips tube designation naming scheme special quality variants may have the letters sq appended, or the device description letters may be swapped with the numerals e. I also have the ecl86 pamphlet 4094 from 1962 and the ecl86 designs are taken from this. Mullard magic stocks vintage radio, military radio like r1155, t1154, ws19, military spare parts, valves, tubes by gec brimar mullard ecc83 kt66 ecc32 u52, radio components early wireless, vintage radio, domestic vintage radio, old technology of all kinds. This book has a special meaning to me because the first amplifier i ever built, as a young teen in the 60s, was a mullard 520. The mullard 510 ten watt valve amplifier october 2014. These range from a 3w singleended amp to a 20w pushpull power. Some of this material is general and applies as much to hifi circuits as to guitar amps, but some of it is very. Stern mullard 3 valve 3 watt amplifier 33 stern mullard 510 amplifier and remote control unit.
Mullard circuits for audio amplifiers by james perrett wed dec 19, 2018 9. Before the advent of the ef86 the mullard valve of choice for preamplifier stages was the ef37a mullard describe the ef86 as a low noise pentode intended for use as a rc coupled datasheett voltage amplifier, particularly in the early stages of high gain audio amplifiers, microphone preamplifiers and magnetic tape recorders. Special quality variants may have the letters sq appended, or the device description letters may be swapped with the numerals e. Mullard circuits for audio amplifiers by james perrett. Fundamentals of amplification this chapter deals with the design and analysis of the basic triode gain stage, which is the main building block of a valve preamp. These amplifiers were the product of their applications lab and the first design was the mullard 510 from 1954. Electroharmonix is a leading manufacturer of guitar effects pedals, vacuum tubes, and electronic and pro audio parts and supplies. Hafler and keroes valve amp schematic from audio engineering 1951 in searchable and scalable pdf. Building the mullard 510 amplifier primary windings. Mullard tube circuits for audio amplifiers code 2005. This is a quick tutorial with our service technician taking you through the circuit of the mullard 33 valve amplifier, a british vintage classic from the late 50s, early 60s. Mullard, such as technical data, publi cations, films, displays, etc. First published in 1959 and then reprinted several times it contained a number of designs by mullard engineers for high quality audio amplifiers, which were to be used by amateur constructors as well as by manufacturers as the basis for many. Power triode power triode valve driver amplifier mullard 425 x363 mullard el37 i500 triode push.
Mullard reference manual of transistor circuits mullard ltd 1st ed 1960 acrobat 7 pdf 11. A push pull valve amplifier almost invariably follows one of the two schemes shown in block. Most postwar european thermionic valve vacuum tube manufacturers have used the mullardphilips tube designation naming scheme. Mullard, a prominent british maker of vacuum tubes, similarly published a book entitled mullard tube circuits for audio amplifiers h. It contains simple, clear descriptions of the theory of valve amplification and the design of circuits, together with practical stepbystep instructions for building a number of excellent amplifiers. The mullard 510 ten watt valve amplifier the messui place. Mullard e88cc double triode valve tube guitar amps. Mullard circuits for audio amplifiers primary windings. Ul41 mullard philips uk holland audio output pentode valve tubes. This is a quick tutorial with our service technician taking you through the circuit of the mullard 510 valve amplifier, a british vintage classic from the late 50s, early 60s. After some time, i said to him that if he would fulfil my wishes, i would supply him with a paper concerning the matter and a practical construction that could be built by amateurs, resulting in a. The vseries from the 1950s included a small el84 pp called v15 and a high power version model v120. For musicians use and to promote sag, the two output diodes may be replaced with a ez80 or ez81 rectifier valve, although you should also provide it with its own extra vt1036 heater transformer to avoid a large voltage difference between the cathode and heater i. Audiophiles, guitarists and general hobbyists alike will find this book an invaluable source of detailed information on transformers, rectifiers, smoothing, highvoltage series and shunt.
The circuit was first published in practical wireless magazine the amplifier featured five valves and an output of 10 watts. One of the finest amplifiers available for hobbyists to build in the early 1960s was the mullard 510 ultralinear valve unit. Mullard circuits for audio amplifiers is a famous book by the technical services department of mullard ltd, a british valve manufacturing company. In the foreground, the 10w and 40w transistors amplifier may be. Advice on the use and applications of mullard valves and electron tubes is freely available to designers and manufacturers of equipment, and to research workers. Mullard magic is run by a long term collector of vintage electronics, classic cameras, classic watches, automobilia and classic cars who has extended his passion to aid other collectors worldwide to obtain a wide range of scarce and desirable vintage radios, vintage valves or tubes, military radios, vintage hifi audio items as well as other. The v60 was one of the last valve amplifiers from bofa. Before the advent of the ef86 the mullard valve of choice for preamplifier stages was the ef37a mullard describe the ef86 as a low noise pentode intended for use as a rc coupled af voltage amplifier, particularly in the early stages of high gain audio amplifiers, microphone preamplifiers and magnetic tape recorders. Mullard circuits for audio amplifiers the valve museum. Output pentodeoutput pentode rated for 25w anode dissipation,ntended for use in a. In preparing the second edition of the mullard valve and.
The e88cc is not pin compatible and not designed to replace an ecc8312ax7. The mullard 510 was a circuit for a valve amplifier designed by the british valve company, mullard in 1954 at the mullard applications research laboratory arl in mitcham surrey uk, part of the new road factory complex, to take advantage of their particular products. Service guide, the whole of the text has been carefully revised to include data on new valves. The most important of these to the designer of new equipment are indicated by heavy print in the valve data section. This valve was specially designed by mullard for the. I always obtain a certificate of posting which i will send to you in the event that an item goes missing, so that you can follow up. The ht supply for pre amplifiers should be taken from c14.
The last decade has seen a growing interest in valve amplifiers, which is not only due to nostalgia but more to the fact that a good valve amplifier sounds different from most solid state. Mullard tube circuits for audio amplifierspower amplifiers and preamplifiers for monaural and stereophonic reproduction from. Vinglg, jql i mullard i vsa my3275 7573 my3275 power triode directly heated triode rated for a, modulators. Details of the mullard 520 more information on the mullard 520 amplifier and circuitry can be found on this site. Mullard tube circuits for audio amplifier book free shipping. Electroharmonix 5501 2nd street long island city, ny 11101. The reference numbers are for the latest reprints of the publications. Mullard valve measurement and application laboratory.
Mullard tube circuits for audio amplifier book free. The mullard 3 3 amplifier in the early 1950s mullard produced a number of amplifier designs to promote their valves. Schematic from 1949 wireless world article new version by d. Mullard in the mid fifties and show distortion versus output power for two. Construction and assembly the chassis for the 10 w amplifier in which tone and volume controls are incorporated is made from three separate pieces of 16. Note that while this valve can be classed like an ecc83 12ax7. Mullard rearranged the part number from the expected ecc88 to e88cc to highlight that it is designed as a long service valve.
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